Catia Geneartive SHape.pdf

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Click Surface Rebuild P51 Mustang CATIA V5R16 Freeform Freeform Surface Rebuild Surface Rebuild P51 V5R16 Freeform Surface Version 1a Jan P51 Mustang Tutorial select
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 1
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
(Tutorial 4 – Rebuild P51 Mustang)
CATIA V5 Freeform Surfaces
Infrastructure
Sketcher
Freestyle (Surface-modeling)
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 2
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
CATIA  Freeform Surface-modeling
Tutorial 4A
– Create three Extrude surfaces, offsetting from X,Y,Z planes
–
Apply reference pictures onto the three surfaces
– Create a sketch for each cross-section and then relocate 
them to the corresponding positions
Tutorial 4B & 4C
– Create 3D curves, then create Freeform surfaces
–
First create the Body, then the Wing, and finally the Tail
–
Create a symmetric model by mirroring the resultant 
surfaces by a reference plane
Please be reminded that this series of tutorials is designed to demonstrate a design 
approach with CATIA, rather than the command itself. 
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 3
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Change the view with the mouse
A.
Panning enables you to move the 
model on a plane parallel to the 
screen. Click and hold the middle 
mouse button, then drag the 
mouse.
B.
Rotating enables you to rotate 
the model around a point. Click 
and hold the middle mouse button 
and the right button, then drag the 
mouse.
C.
Zooming enables you to increase 
or decrease the size of the model. 
Click and hold the middle button, 
then click ONCE and release the 
right button, then drag the mouse 
up or down.
Middle button
Right button
General
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 4
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
•
Create a Project Folder (e.g. C:/P51)
•
Download the reference pictures from the web:
http://myweb.polyu.edu.hk/~mmdsham/images/p51/
- p51-front.jpg
- p51-right.jpg
- p51-top.jpg
(The pictures are square in shape, 1000x1000 pixels)
•
Then Save them into the project folder
•
Enter CATIA by double-clicking its icon on the desktop
•
By default, a empty “Product” file is created. But now, 
you don’t need this, just select “File/Close” on the 
menu
•
Select ‘Start/Shape/Generative Shape Design”on the 
menu bar
•
Uncheck “Enable Hybrid Design” and then click “ok”
•
(An empty part is now created on “Generative Shape 
Design” workbench.) 
Preparation
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 5
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a Geometrical Set:-
•
Select “Insert/ Geometrical Set” on the menu bar
•
Type “Reference” as the name
•
Click ok to complete
To create a Sketch:-
•
Click “Sketch” icon and select “yz” plane
•
Draw a vertical straight line on the left
•
(Length ~ 120mm, Location ~100mm from origin) 
•
(Before clicking the 2nd point, refer to the L value 
on the toolbar “Sketch Tools” )
•
Click Exit to complete
Length
Preparation
1st point of the vertical line
2nd point of the vertical line
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 6
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To Create an Extrude Surface:-
•
Click “Extrude” icon
•
Select “Sketch1” as profile, “yz plane” as direction
•
Click “Reverse Direction”
•
Push the mouse cursor onto Limit 1 and then drag it 
up to ~285mm
•
Click ok to complete
To Apply a Texture material onto the surface:-
•
Click “Apply Material” icon
•
Select a Texture material, e.g. “B&W Tiling” on the list
•
Click on the Extrude surface
•
Click ok to complete
•
To view the texture, click “Shading with material” icon
Drag it up to 
~285mm
Preparation
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 7
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To replace the texture by a picture:-
•
Double-click “B&W Tiling” on the tree
•
Select the tab page “Rendering”
•
Click on the sub-tab page “Texture”
•
Select “Image” as type
•
Click “…” icon to select a picture file
•
Select the file “p51-right.jpg” in your project folder
•
Click “Open”
•
(Now, the projection method is not correct to show the 
picture on the surface)
•
Select “Cubical Mapping”
•
Deselect U,V repeat
•
Flip U
•
Click ok to complete
result
Preparation
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 8
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create another sketch:-
•
Click “Sketch” icon, then select “zx plane”
•
Draw a vertical line on the left
(with one end touching x-axis)
•
Click “Constraint” icon, then select the line
•
Modify the length to 25.4mm (1inch)
•
Click Exit to complete
To resize and relocate the reference picture:-
•
Click “Right View” icon (or click “y” on the compass)
•
Double-click “B&W Tiling” on the tree again
•
Select the tab page “Rendering”
•
Adjust the values “Scale U,V” and “Position U,V” until 
the scale 1-2 is nearly of the same height as Sketch.2
•
Keeping the Scale unchanged, adjust UV positions so 
that the peak point of the image lies on the origin
•
Click ok to complete
Sketch.2 
(1 inch Line)
Preparation
System 
origin (0,0,0)
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 9
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To delete Sketch.2:-
•
Click “Sketch.2” on the tree
•
Press “Delete” key on the keyboard
•
Click ok to confirm
To resize the surface to fit the picture:-
•
Double-click “Extrude.1” on the tree
•
Drag “Limit.1” so that the surface edge is touching the 
tail of the image
•
(optional) To change the increment, right-click on the 
entry box of “Dimension, Limit1”, then select “Change 
step/ new one”, enter 0.1mm, finally click ok 
•
Click ok to complete
(Now, the scale, the location & the size of the Right 
View image are correct)
Preparation
drag
Right-click 
here to change 
the increment
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 10
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a sketch:-
•
Click “Sketch” icon and select “yz” plane
•
Draw a horizontal line as shown
•
(Length ~ 200mm, Location ~100mm under origin) 
•
(Before clicking the 2nd point of the line, refer to the L 
value on the toolbar “Sketch Tools” )
•
Click Exit to complete
To create an Extrude Surface:-
•
Click “Extrude” icon
•
Select “Sketch.3” as profile, “yz plane” as direction
•
Click “Reverse Direction”
•
Keep the Dimensions UNCHANGED (which should 
be the same as Extrude.1)
•
Click ok to complete
Right view 
(sketch.1)
Draw a line
New Extrude 
surface
Preparation
~200mm
~100mm
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 11
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To apply a Texture material onto the surface:-
•
Click “Apply Material” icon
•
Select a Texture material, e.g. “B&W Tiling” on the list
•
Click on the Extrude.2 surface
•
Click ok to complete
To replace the texture by a picture:-
•
Double-click “B&W Tiling” on the tree
•
Select the tab page “Rendering”
•
Click on the sub-tab page “Texture”
•
Select “Image” as type
•
Click “…” icon to select a picture file
•
Select the file “p51-top.jpg” in your project folder
•
Click “Open”
•
(The projection method is correct to show the picture 
on the surface, so we needn’t change it)
•
Deselect U,V repeat
Preparation
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 12
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
•
Click “Top View” icon (or click “z” on the compass)
•
Adjust UV scales until the peak & the tail both touch 
the surface edge
•
Keeping UV scales unchanged, adjust UV position to 
locate the peak point of the image onto the origin
•
Click ok to complete
Preparation
Touch the 
surface edge
Touch the 
surface edge
System 
origin (0,0,0)
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 13
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a sketch:-
•
Click “Sketch” icon and select “zx” plane
•
Draw a vertical line as shown
•
Draw two horizontal axes as reference, then adjust 
the vertical line so that the two axes touch the 
maximum & the minimum points respectively
•
Click Exit to complete
To Create an Extrude Surface:-
•
Click “Extrude” icon
•
Select “Sketch.4” as profile, “zx plane” as direction
•
Click “Reverse Direction”
•
Drag “Limit.2” so that the extrusion lengths in both 
directions are nearly the same
•
Click ok to complete
Draw a line
Drag “Limit2”
New extrude 
surface
Preparation
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 14
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To Apply a Texture material onto the surface:-
•
Click “Apply Material” icon
•
Select a Texture material, e.g. “B&W Tiling” on the 
list
•
Click on the Extrude.3 surface
•
Click ok to complete
To replace the texture by a picture:-
•
Double-click “B&W Tiling” on the tree
•
Select the tab page “Rendering”
•
Click on the sub-tab page “Texture”
•
Select “Image” as type
•
Click “…” icon to select a picture file
•
Select the file “p51-front.jpg” in your project folder
•
Click “Open”
•
(Now, the projection method is not correct to show 
the picture on the surface)
•
Select “Cubical Mapping”
•
Deselect U,V repeat
Preparation
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 15
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
•
Click “Front View” icon (or click “x” on the compass)
•
Adjust UV scales until the image extremums touch 
the surface edge respectively
•
Keeping UV scales unchanged, adjust UV position to 
locate the centerline of the image onto the origin
•
Click ok to complete
Preparation
System 
origin (0,0,0)
result
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 16
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
•
(Now, all three views are aligned)
•
Modify Sketch1, Extrude1 to adjust Right View
•
Modify Sketch3, Extrude2 to adjust Top View
•
Modify Sketch4, Extrude3 to adjust Front View
•
(Remark: The three surfaces are just the projection 
screens. No matter how we change their positions or 
sizes, the three views are still aligned)
Right View 
(Sketch1)
Front View 
(Sketch4)
Top View 
(Sketch3)
Right View 
(Sketch1)
Front View 
(Sketch4)
Top View 
(Sketch3)
Preparation
Move the 
surface to 
left
Move the 
surface 
downward
result
result
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 17
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
Hide Sketch1, Sketch3 & Sketch4
To make a geometrical set UnPickable:-
•
Right-Click “Reference” on tree
•
Select “Properties”
•
Deselect “Pickable” and click ok to complete
•
(Now all elements in “Reference” cannot be 
picked by the mouse)
To Create a Geometrical Set:-
•
Select “Insert/ Geometrical Set” on the menu 
bar
•
Click ok to complete
Modeling
Right-click
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 18
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To Create Reference Planes:-
•
Click “Plane” icon
•
Select “yz plane”
•
Click “Right View” icon (or click “y” on compass)
•
Move the mouse cursor onto “Offset” (green 
color) and then drag it onto “section B” of the 
image
•
(Offset value ~ 21mm)
•
Click ok to complete
•
Repeat the above steps for sections “D,G,H,I”
of the image
•
(optional: to change increment, right-click on the 
entry box of “Offset”, then select change step/ 
new one, and then enter 0.5mm; click           to 
fine-tune the offset value)
Modeling
Section B
Section D
Section G
Section H
Section I
Drag “Offset” to 
move the plane
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 19
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To Create Reference Planes (Cont’):-
•
Click “Plane” icon
•
Select “zx plane”
•
Click “Top View” icon (or click “z” on compass)
•
Move the mouse cursor onto “Move” (green 
color) and then drag it near “section 1” of the 
image
•
Move the mouse cursor onto “Offset” (green 
color) and then drag it onto “section 1” of the 
image
•
(Offset value ~ 14mm)
•
Click ok to complete
•
Click “Plane” icon again
•
Select “plane6” (the previous plane at section1)
•
Enter 25mm as offset value (or drag “Offset”)
•
Click ok to complete
•
Click “Plane” icon again
•
Select “plane6” (the previous plane at section1)
•
Enter 125mm as offset value (or drag “Offset”)
•
Click ok to complete
Modeling
Drag “Move” to move the 
plane (Offset value will 
NOT be changed)
“Move” the plane 
near Section1
plane8
plane7
plane6
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 20
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
(Cont’):-
•
Double Click Plane.6
•
Click “Reverse Direction” icon
•
Click ok to confirm
•
Double Click Plane.7
•
Click “Reverse Direction” icon
•
Click ok to confirm
•
Double Click Plane.8
•
Click “Reverse Direction” icon
•
Click ok to confirm
•
(We are going to build the model on the Right-
Hand Side, therefore we flip these 3 offset 
planes onto that side)
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 21
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To Create a 3D Spline Curve (1st):-
•
Select ‘Start/Shape/Freestyle” on the menu 
bar
•
Right-Click on the red dot of the compass, then 
select “ Lock Privileged Plane Orientation 
Parallel to screen”
•
Click “Right View” icon
•
Click “3D curve” icon
•
Based on the picture, draw a 3D curve with four 
control points (as shown below)
•
Click ok to complete
Modeling
Right-
click the 
red dot
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 22
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To Create a 3D Spline Curve (2nd):-
•
(if needed) Click “Right View” icon again
•
Click “3D curve” icon
•
Based on the picture, draw a 3D curve with four 
control points (as shown below)
•
Click ok to complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 23
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To Create a 3D Spline Curve (3rd):-
•
Click “Top View” icon again
•
Click “3D curve” icon
•
Based on the picture, draw a 3D curve with four 
control points (as shown below)
•
Click ok to complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 24
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a sketch on Section D:-
•
Select “Start/Shape/Generative Shape 
Design” on the menu bar
•
Click “Sketch” icon, select “zx plane”
•
Draw a vertical axis on Section D, going through 
its center
•
Draw another two horizontal axes on Section D
•
Draw an Arc (Three point arc starting with limits)
•
Draw two Connect Curves (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the arc endpoints to finetune the profile to 
match the image
•
Click Exit to complete
Modeling
Connect 
Curve
Three point 
arc
Connect 
Curve
Three 
point arc
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 25
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To reposition the sketch of Section D:-
•
Right-click “Sketch5”
•
Select “Sketch.5 object/ Change Sketch Support“
•
Select “Plane2” (for section D)
•
Select “Positioned” as Type
•
Click ok to confirm
•
Double-Click “Sketch5” to edit
•
Multi-select “3D Curve1”, “3D Curve2” & “3D 
Curve3”
•
Click “Intersect 3D elements” icon to get 3 
intersection points
•
Select all curves & axes
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Add three coincidence constraints to make the 
profile touch the three intersection points
•
Click Exit complete
Modeling
3 intersection 
points with 
sketch plane
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 26
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a sketch on Section G:-
•
Click “Sketch” icon, select zx plane
•
Draw a vertical axis on Section G, going through 
its center
•
Draw another horizontal axis on Section G
•
Draw an Arc (Three point arc starting with limits)
•
Draw a horizontal line
•
Draw two Connect Curves (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the arc endpoints to finetune the profile to 
match the image
•
Click Exit to complete
Modeling
Connect 
Curve
Three point 
arc
Connect 
Curve
Line
Tangency 
continuous only
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 27
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To reposition the sketch of Section G:-
•
Right-click “Sketch6”
•
Select “Sketch.6 object/ Change Sketch Support“
•
Select “Plane3” (for section G)
•
Select “Positioned” as Type
•
Click ok to confirm
•
Double-Click “Sketch6” to edit
•
Multi-select “3D Curve1”, “3D Curve2” & “3D 
Curve3”
•
Click “Intersect 3D elements” icon to get 3 
intersection points
•
Select all curves & axes
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Add Two coincidence constraints to make the 
profile touch these two intersection points
Modeling
3 intersection 
points with 
sketch plane
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 28
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
(Cont’):-
•
Delete the portion as shown
•
Draw a horizontal axis starting from the 
remaining intersection point
•
Shorten the arc by dragging its 
endpoint
•
Draw a Connect Curve  between the 
axis and the arc
•
Click Exit to complete
•
(Remark: Here is the way to shorten a 
curve without changing its curvature…)
Modeling
delete
Connect 
Curve
Draw an axis 
across the 
curve
Use “Quick Trim”
to cut the curve
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 29
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a sketch on Section H:-
•
Click “Sketch” icon, select zx plane
•
Draw a vertical axis on Section H, going through 
its center
•
Draw another two horizontal axes on Section H
•
Draw an Arc (Three point arc starting with limits)
•
Draw two Connect Curves (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the arc endpoints to finetune the profile to 
match the image
•
Click Exit to complete
Modeling
Connect 
Curve
Three point 
arc
Connect 
Curve
Tangency 
continuous only
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 30
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To reposition the sketch of Section H:-
•
Right-click “Sketch7”
•
Select “Sketch.7 object/ Change Sketch Support“
•
Select “Plane4” (for section H)
•
Select “Positioned” as Type
•
Click ok to confirm
•
Double-Click “Sketch7” to edit
•
Multi-select “3D Curve1”, “3D Curve2” & “3D 
Curve3”
•
Click “Intersect 3D elements” icon to get 3 
intersection points
•
Select all curves & axes
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Add three coincidence constraints to make the 
profile touch the three intersection points
•
Click Exit complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 31
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a Sketch on Section I:-
•
Click “Sketch” icon, select zx plane
•
Draw a vertical axis on Section I, going through 
its center
•
Draw another two horizontal axes on Section I
•
Draw an Arc (Three point arc starting with limits)
•
Draw two Connect Curves (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the arc endpoints to finetune the profile to 
match the image
•
Click Exit to complete
Modeling
Connect 
Curve
Three point 
arc
Connect 
Curve
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 32
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To reposition the Sketch of Section I:-
•
Right-click “Sketch8”
•
Select “Sketch.8 object/ Change Sketch Support“
•
Select “Plane5” (for section I)
•
Select “Positioned” as Type
•
Click ok to confirm
•
Double-Click “Sketch8” to edit
•
Multi-select “3D Curve1”, “3D Curve2” & “3D 
Curve3”
•
Click “Intersect 3D elements” icon to get 3 
intersection points
•
Select all curves & axes
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Add three coincidence constraints to make the 
profile touch the three intersection points
•
Click Exit complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 33
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To create a sketch on Section B:-
•
Click “Sketch” icon, select zx plane
•
Draw a vertical axis on Section B, going through 
its center
•
Draw a horizontal axis on Section B
•
Draw an Arc (Three point arc starting with limits)
•
Draw a line
•
Draw a Connect Curve (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the arc endpoints and/or adjust the 
tensions to finetune the profile to match the 
picture
•
Click Exit to complete
Modeling
Three point 
arc
Connect 
Curve
Line
tangent
tangent
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 34
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4A
To reposition the sketch of Section B:-
•
Right-click “Sketch9”
•
Select “Sketch.9 object/ Change Sketch Support“
•
Select “Plane1” (for section B)
•
Select “Positioned” as Type
•
Click ok to confirm
•
Double-Click “Sketch9” to edit
•
Multi-select “3D Curve1”, “3D Curve2” & “3D Curve3”
•
Click “Intersect 3D elements” icon to get 3 intersection 
points
•
Select all curves & axes
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Add three coincidence constraints to make the profile 
touch the three intersection points
•
Click Exit complete
Save the file as p51.CATpart
Modeling
END of Tutorial 4A
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 35
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To create two Extrude surfaces:-
•
Select “Start/Shape/Freestyle” on the menu 
bar
•
Click “Extrude” icon
•
Select “3D Curve.1”
•
Select “Normal to the curve” as direction
•
Drag on the double arrow on the preview 
surface to the left, up to ~20mm
•
Click ok to complete
•
Similarly, create another “Extrude” surface 
from “3D Curve.2”
Hide “3D Curve1” and “3D Curve2”
Modeling
Normal to 
curve
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 36
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Create a Net Surface:-
•
Click “Net Surface” icon
•
Pressing “CTRL” key on the keyboard, multi-
select “Sketch5” , “Sketch6”, “Sketch7” and 
“Sketch8” as Guides
•
Click on the text “Profiles(0)”
in the 
command window
•
Pressing “CTRL” key on the keyboard, multi-
select the surface edge     , “3D Curve3” and 
another surface edge      as Profiles
•
Change the continuity on both surface edges as 
“TANGENT”
•
Click ok to complete
Modeling
result
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 37
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Disassemble a multi-faces Surface:-
•
Click “Disassemble” icon
•
Select “Net Surface.1”
•
Select “All Cells:3” as Disassemble mode
•
Click ok to complete
•
(Three surfaces are created, representing each 
face of NetSurface.1)
•
Delete Netsurface.1 (or hide it) 
To convert 3 surfaces into ONE Surface:-
•
Click “Concatenate” icon
•
Select “Auto Update Tolerance”
•
Multi-select two surfaces (Surface3 & Surface4)
•
Click Apply, then click ok to complete
•
Click “Concatenate” icon again
•
Select “Auto Update Tolerance”
•
Multi-select two surfaces (Surface5 & Surface6)
•
Click Apply, then click ok to complete
Modeling
result
surface3
surface4
surface5
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 38
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Create a Net Surface (2nd):-
•
Hide “Sketch5” , “Sketch6”, “Sketch7” and “Sketch8”
•
Click “Net Surface” icon
•
Pressing “CTRL” key on the keyboard, multi-select the 
surface edge      and then “Sketch9” as Guides
•
(REMARK: The surface edge must be selected FIRST 
because its shape is more important than “Sketch9”)
•
Change the continuity on the surface edge as 
“CURVATURE”
•
Click on the text “Profiles(0)”
in the command window
•
Pressing “CTRL” key on the keyboard, multi-select the 
surface edge     , “3D Curve3” and another surface edge      
as Profiles
•
Change the continuity on both surface edges as 
“TANGENT”
•
Click “Apply” to preview FIRST
Modeling
Sketch.9
3D Curve3
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 39
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
(Cont’):-
•
From the preview, the portion near Sketch9 
is not smooth, therefore …
•
Change “Curvature Continuity” to “Point 
Continuity”
•
Click ok to complete
•
(It leads to a sharp edge between this 
NetSurface and its connecting surface, but 
we will correct it later)
•
(Remark: “NetSurface2” should be a single-
face surface because it is built from an edge 
of another single-face surface)
Modeling
bad
good
Curvature continuity 
between 2 surfaces
Point continuity 
between 2 surfaces
result
If Sketch5 is used as 
the guide, the resultant 
surface will be a multi-
faces surface. To 
convert it into a single-
face surface, refer to 
the previous page.
Sketch5 (with 3 curves)
(Supplement)
Sharp edge
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 40
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
Hide “Surface1” & “Surface2” (two extrude 
surfaces)
Hide “3D curve3” & “Sketch9”
To Shorten surfaces:-
•
Click “Extend” icon
•
Click on “NetSurface2”
•
(A new surface will be created, click ok to 
accept)
•
Drag on the green dot to shorten the surface by 
around 13mm
•
Click ok to complete
•
Delete “NetSurface2” (or hide it)
•
Similarly, Shorten “Surface7” by ~13mm
To create a Blend Surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two surface edges
•
Change both continuities to “CURVATURE”
•
Click ok to complete
Modeling
surface7
netsurface2
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 41
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Create a 3D Spline Curve:-
•
Right-click on the compass, check if the option 
“Lock Privileged Plane Orientation Parallel to 
Screen” is on
•
Click “Right VIew” icon
•
Click “3D Curve” icon
•
Draw a curve with 3 control points as shown
•
Right Click on the control point near the origin, 
then select “EDIT”
•
Change “x”,”y”,and “z” to 0mm, select “Close”
•
Right-click on the control point again, then 
select “Impose tangency”
•
Right-click on the green arc, then select “Edit”
•
Change “x”, “y” to 0mm, change “z” to 1mm
•
Select Close
•
Adjust the other control points to match the 
image
•
Click ok to complete
Modeling
Control point at 
origin, pointing 
vertically
Result
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 42
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To create a Revolve surface:-
•
Click “Revolve” icon
•
Select “3D Curve.4” as profile
•
Right-Click on the entry box “Revolution axis”
•
Select “X axis”
•
Enter 0 as Angle1
•
Enter 180 as Angle2
•
Click ok to complete
•
Hide “3D Curve.4”
To create a Blend Surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two surface edges
•
Change both continuities to “CURVATURE”
•
Click ok to complete
Modeling
result
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 43
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
Check Surfaces:
•
Click “Right View” icon; The surfaces should 
match the right view
•
Click “Top View” icon; they should also match 
the top view. (because most of the control 
curves were referred to these two views)
•
Click “Front View” icon
•
If any misalignment is found, adjust the image 
location of the front view
Modeling
adjust
Fine-Tune 
front view 
image
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 44
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To make a surface SemiTransparent:-
•
Right-Click “Surface7”
•
Select “Properties”, change Transparency to 50
•
Click ok to confirm
To Make a 3D curve:-
•
Click “Right View” icon
•
Click “3D Curve” icon
•
“Disable geometry detection” (we will not click a point 
on the existing surface)
•
Draw a curve with 5 control points as shown
•
Click ok to complete
To Cut a surface by a curve (not on the surface):-
•
Click “Break Surface or Curve” icon
•
Select “Break Surfaces by Curves” as Type
•
Select “Along Compass” as direction
•
Select “Surface 7” as Cut
•
Select “3D Curve5” as Cutting
•
Click Apply
•
Click on the portion to remove
•
Click ok to complete
Modeling
Surface7
Surface.7
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 45
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
Hide “3D Curve.5”
To make a 3d curve:-
•
Click “Right View” icon (if the current viewpoint 
is not Right View)
•
Click “3D Curve” icon
•
Draw a curve with 4 control points as shown
•
(We need to rotate the model a little bit so that 
we can snap the last point onto the existing 
endpoint)
•
Click ok to complete
To create an Extrude surface:-
•
Click “Extrude” icon
•
Select “3D Curve.6”
•
Select “Normal to the curve” as direction
•
Drag the double arrow on the preview surface 
to the left, up to ~15mm
•
Click ok to complete
Modeling
3D Curve.6
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 46
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Reset the graphic properties of a surface:-
•
Right Click “Surface.7” (transparent surface)
•
Select “Surface.7 object/ Reset Properties”
•
Select “Apply to Children”
•
Click ok to confirm (the default graphic properties 
will be restored)
To Create a Blend Surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two surface edges
•
Disable “Project End points”
•
Change the continuities as shown
•
Drag the point     to match the image
•
Click “Front View” icon
•
Adjust the tension values to match the image
•
Click ok to complete
Modeling
Tangent 
continuous
Point 
continuous
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 47
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
Hide “3D Curve.6” & “Surface.11”
To make a 3d curve:-
•
Click “3D Curve” icon
•
Pick the existing endpoint
•
(When the endpoint is detected, a red dashed 
circle appears)
•
Click “Front View” icon
•
“Disable geometry detection”
•
Pick another point on the right
•
Right-click on the first point, then select “Edit”
•
Copy the Z value
•
Right-click on the second point, then select “Edit”, 
then past the previous Z value onto this Z value
•
Click ok to complete
To make another 3d curve:-
•
Rotate the 3D model as shown
•
Click “3D Curve” icon again
•
Pick the two existing endpoints
Modeling
Surface.11
3D Curve.6
1st
2nd
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 48
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
Cont’:-
•
Then click “Insert a Point” icon
•
Click the middle of the line (the middle point will 
then be created)
•
Click “Front View” icon
•
“Disable geometry detection”
•
Drag the middle point to match the image
•
Click “Right View” icon
•
Drag the middle point to match the image
•
Click ok to complete
To make a Blend curve:-
•
Click “Freestyle Blend Curve” icon
•
Select the two 3D curves
•
Change the continuities to “Tangent”
•
Drag on the endpoints to change their positions 
until the blend curve can match the image
•
Click ok to complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 49
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Cut a curve by another curve:-
•
Click “Break Surface or Curve” icon
•
Select “Curves by Curves” as Break Type
•
Select “3D Curve.7” as Cut
•
Select “Curve.1” (previous blend curve) as 
Cutting
•
Click Apply
•
Click on the portion to remove
•
Click ok to complete
•
Similarly, remove the portion on “3D Curve.8”
To Convert THREE curves into ONE curve:-
•
Click “Concatenate” icon
•
Multi-select the three curves
•
Click Apply , then click Ok to complete
Modeling
remove
3D Curve.7
Curve.1
3D Curve.8
result
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 50
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To create a Blend surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the curve
•
Select the surface edge
•
Click ok on the pop-up window
•
Select “Project Endpoints” option
•
Select “Point” as the continuity
•
Drag the three green points to limit (as shown)
•
Click ok to complete
Hide “Curve.4”
Modeling
Point continuity
Drag the 
green point
Drag
Drag
Drag the 
green point
Curve.4
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 51
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To make a 3d curve:-
•
Click “Top View” icon 
•
Click “3D Curve” icon
•
Draw a curve with 2 control points as shown
•
Click “Front View” icon
•
Drag the two control points to match the image
•
Click ok to complete
•
Similarly, draw another two 3D Curves as 
shown below (“3DCurve.10” & “3DCurve.11”)
Modeling
3D Curve.10
3D Curve.11
3D Curve.9
3D Curve.10
3D Curve.9
3D Curve.11
Top View
Front View
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 52
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To create a Sketch on Section 3:-
•
Select “Start/Shape/Generative Shape 
Design” on the menu bar
•
Click “Sketch” icon, select xy plane
•
Draw a spline curve with 4 control points on the 
image of Section3
•
Draw another spline curve with 3 control points 
on the image of Section3
•
Draw a Connect Curve (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the tensions to match the image
•
Click Exit to complete
Modeling
Spline
Connect 
Curve
Spline
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 53
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Reposition the Sketch of Section 3:-
•
Right-click “Sketch10”
•
Select “Sketch.10 object/ Change Sketch Support“
•
Select “Plane8” (for section 3)
•
Select “Positioned” as Type
•
Select “Reverse H”
•
Click ok to confirm
•
Double-Click “Sketch10” to edit
•
Multi-select “3D Curve9” & “3D Curve10”
•
Click “Intersect 3D elements” icon to get two 
intersection points
•
Select all curves
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Adjust the profile so that it can touch “3D Curve9”
•
Click Exit complete
Modeling
3D 
Curve9
3D 
Curve10
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 54
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Create a Sketch on Section 2:-
•
Click “Sketch” icon, select xy plane
•
Draw a spline curve with 4 control points on the 
image of Section2
•
Draw another spline curve with 3 control points 
on the image of Section2
•
Draw a Connect Curve (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the tensions to match the picture
•
Click Exit to complete
Modeling
Spline
Connect 
Curve
Spline
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 55
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Reposition the sketch of Section 2:-
•
Right-click “Sketch11”
•
Select “Sketch.11 object/ Change Sketch Support“
•
Select “Plane7” (for section 2)
•
Select “Positioned” as Type
•
Select “Reverse H”
•
Click ok to confirm
•
Double-Click “Sketch11” to edit
•
Multi-select “3D Curve10” & “3D Curve11”
•
Click “Intersect 3D elements” icon to get two 
intersection points
•
Select all curves
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Adjust the profile so that it can touch “3D Curve11”
•
Click Exit complete
Modeling
3D 
Curve11
3D 
Curve10
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 56
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Create a Sketch on Section 1:-
•
Click “Sketch” icon, select xy plane
•
Draw a spline curve with 4 control points on the 
image of Section1
•
Draw another spline curve with 3 control points 
on the image of Section1
•
Draw a Connect Curve (double click on it to 
change the tangential direction at the endpoints)
•
Adjust the tensions to match the image
•
Click Exit to complete
Modeling
Spline
Connect 
Curve
Spline
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 57
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Reposition the Sketch of Section 1:-
•
Right-click “Sketch12”
•
Select “Sketch.12 object/ Change Sketch Support“
•
Select “Plane6” (for section 1)
•
Select “Positioned” as Type
•
Select “Reverse H”
•
Click ok to confirm
•
Double-Click “Sketch12” to edit
•
Multi-select “3D Curve10” & “3D Curve11”
•
Click “Intersect 3D elements” icon to get two 
intersection points
•
Select all curves
•
Click “Translate” icon
•
Deselect “Duplicate mode”
•
Click the point
•
Then click the point
•
Adjust the profile so that it can touch “3D Curve11”
•
Click Exit complete
Modeling
3D 
Curve11
3D 
Curve10
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 58
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To create a Blend Surface:-
•
Select “Start/ Shape/ Freestyle” on the menu 
bar
•
Click “Freestyle Blend Surface” icon
•
Select the curve
•
Select the curve
•
Select “Point” as the continuity on both sides
•
Click ok to complete
•
Similarly, Click “Freestyle Blend Surface” icon 
again
•
Select the curves
•
Select “Point” as the continuity on both sides
•
Click ok to complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 59
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Create another Blend Surfaces:-
•
Click “Freestyle Blend Surface” icon
•
Select the surface edge
•
Select the surface edge
•
Select “Curvature” as the continuity on both sides
•
Select “Approximated” as Blend Type
•
Click “Top View” icon
•
Adjust the tension values (green numbers) on both 
sides to match the image
•
Click ok to complete
•
Similarly, create two more Blend Surfaces       as 
shown below (curvature continuous on one side)
Modeling
Top
Bottom 
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 60
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To create a Blend Surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the surface edge
•
Select the surface edge
•
Select “Curvature” as the continuity on both sides
•
Select “Approximated” as Blend Type
•
Click “Top View” icon
•
Adjust the tension values (green numbers) on both 
sides to match the image (two ends only)
•
Click ok to complete
To Modify a Surface by its Control Points:-
•
Click “Control Points” icon
•
Select the previous Blend Surface
•
Select “G2” (keep curvature continuous) on 
surface edges; select “F” (free to move) on the 
other edges
•
Change Nu to 5; Nv to 11 (right-click on the 
number, then select on the list)
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 61
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
Cont’:-
•
Select “Compass Plane” as Support
•
Select “Linear” as Diffusion
•
Select “Linear” as Cross Diffusion
•
Select “Mesh only” as Options
•
Click “Top View’ icon
•
Click on the second column, then drag it 
downward to match the image
•
Similarly, drag the third column, then the fourth 
column to match the image
•
Click ok to complete
Modeling
2nd column
3rd column
4th column
result
drag
drag
drag
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 62
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Shorten surfaces:-
•
Click “Extend” icon
•
Click on “Surface21”
•
Drag on the green dot to shorten the surface by 
around 5mm
•
Click ok to complete
•
Similarly, Shorten “Surface18” by ~5mm
To create a Fill Surface:-
•
Click “Freestyle Fill” icon
•
Select the surface edges of the opening
•
Change all continuities to “Tangent”
•
Click ok to complete
•
(Different from “Fill”, the “Freestyle Fill” surface 
will be updated if its boundary is changed)
•
(Optional: Extend Surface21 to modify this 
“Freestyle Fill” surface)
Modeling
surface21
surface18
opening
drag
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 63
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4B
To Define a Selection Set:-
•
Select “Edit/ Selection Sets Edition” on the menu 
bar
•
Click “Create Set” icon
•
Rename it as “Wing”
•
Select all the surfaces belonging to “Wing” (totally 
7 surfaces)
•
Click ok to complete
To Hide a Selection Set:-
•
Select “Edit/ Selection Sets…” on the menu bar
•
Select “Wing” on the list
•
Click “Select” icon (all surfaces belonging to 
“Wing” will be selected)
•
Click “Hide/Show” icon to hide
•
Click “Close”
Save the file again
Modeling
result
Define a selection set 
for these 7 surfaces
END of Tutorial 4B
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 64
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
Hide all elements, except surfaces & x,y,z planes
To create a 3D Spline Curve:-
•
Click “Right VIew” icon
•
Click “3D Curve” icon
•
Draw a curve with 3 control points as shown
•
Click ok to complete
To create a Curve on a Surface:-
•
Click “Curve on Surface” icon
•
Click on “Surface 7”
•
Draw a curve with 3 control points as shown
•
Click ok to complete
•
Similarly, draw another 2 Curves on the same surface 
as shown
Modeling
surface7
draw
draw
draw
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 65
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Cut a surface by curves:-
•
Click “Break Surface or Curve” icon
•
Select “Break Surfaces by Curves” as Type
•
Select “Along Compass” as direction
•
Select “Surface 7” as Cut
•
Multi-Select the three curves (on surface) as 
Cutting
•
Deselect “Tangential Extrapolation”
•
Click Apply
•
Click on the portion to remove
•
Click ok to complete
Delete the three curves on surface
To create an Extrude surface:-
•
Click “Extrude” icon
•
Select “3D Curve.12”
•
Select “Normal to the curve” as direction
•
Drag the double arrow on the preview surface 
to the left, up to ~15mm
•
Click ok to complete
Modeling
3d Curve.12
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 66
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To create a Blend Surface:-
•
Hide “3D Curve.12”
•
Click “Freestyle Blend Surface” icon
•
Select the two surface edges
•
Disable “Project End points”
•
Change the continuities as shown
•
Drag the point       closer to the point
•
Click “Front View” icon
•
Adjust the tension values to match the image
•
Click ok to complete
Modeling
Tangent 
continuous
Curvature 
continuous
Drag this point
Drag this point
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 67
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
Hide the Extrude surface 
To make a Blend curve:-
•
Click “Freestyle Blend Curve” icon
•
Select the two surface edges
•
Change the continuities as shown
•
Adjust the tensions to match the image 
(Right View)
•
Click ok to complete
To Create an Extrude Surface:-
•
Click “Extrude” icon
•
Select the curve
•
Select “Normal to the curve” as direction
•
Drag the double arrow on the preview 
surface to the left, up to ~15mm
•
Click ok to complete
•
Hide the curve
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 68
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To create a Fill Surface:-
•
Click “Freestyle Fill” icon
•
Select the surface edges of the opening
•
Change the continuities as shown
•
Click ok to complete
Hide the Extrude Surface
To make a 3d curve:-
•
Click “Right View” icon 
•
Click “3D Curve” icon
•
“Disable geometry detection”
•
Draw a curve with 2 control points as shown
•
Click ok to complete
•
Similarly, draw another 3D Curve as shown
Modeling
draw
draw
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 69
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Create a Fillet between two planar curves:-
•
Click “Styling Corner” icon
•
Select the two 3D curves
•
Enter 5mm as Fillet Radius
•
Select “Trim” option
•
Click Apply to preview
•
Click on the portion to keep
•
Click ok to complete
Hide the two 3D Curves
To Convert a multi-segments curve  into a 
single-segment curve:-
•
Click “Concatenate” icon
•
Select “Auto Update Tolerance”
•
Multi-select all segments of the Fillet Curve
•
Click Apply, then click ok to complete
•
Delete the Fillet Curve (or hide it)
Modeling
Click here to 
accept this 
solution
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 70
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To make another 3d curve:-
•
Click “Right View” icon 
•
Click “3D Curve” icon
•
Draw a curve with 2 control points as shown
•
Click “Front View” icon
•
Drag the control points to match the image
•
Click ok to complete
To make another 3d curve:-
•
Click “Right View” icon 
•
Click “3D Curve” icon
•
Draw a curve with 2 control points as shown
•
Click ok to complete
To create an Extrude surface:-
•
Click “Extrude” icon
•
Select the curve
•
Select “Normal to the curve” as direction
•
Drag the double arrow on the preview surface 
to the left, up to ~15mm
•
Click ok to complete
Modeling
draw
draw
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 71
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Create an Extrude Surface:-
•
Click “Extrude” icon again
•
Select the curve
•
Select “Normal to the curve” as direction
•
Drag the double arrow on the preview surface 
to the left, up to ~15mm
•
Click ok to complete
•
Hide the curves
To Create a Net Surface:-
•
Click “Net Surface” icon
•
Multi-select the surface edges      & the curve
•
Change the continuities to “Tangent”
•
Click ok to complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 72
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Modify a Net Surface:-
•
(The highlighted portion of the resultant surface 
is not good enough to accept; some shrinkage 
is found)
•
Double-Click the “3D curve.15”
•
Click “Right View” icon
•
Drag the endpoints horizontally until the 
highlighted portion is improved.
•
(The modified 3D curve should still match the 
front view image)
Hide the two Extrude Surfaces & the 3D 
curve
To Make a 3d curve:-
•
Click “Right View” icon 
•
Click “3D Curve” icon
•
Draw a curve with 2 control points as shown
•
Click ok to complete
Modeling
3d Curve.15
Drag 
horizontally
Drag 
horizontally
bad
good
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 73
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Cut a surface by a curve (not on the 
surface):-
•
Click “Break Surface or Curve” icon
•
Select “Break Surfaces by Curves” as Type
•
(Click “Right View” icon)
•
Select “Along Compass” as direction
•
Select “NetSurface.1” as Cut
•
Select the “3D curve.17” as Cutting
•
Click Apply
•
Click ok to complete (BOTH sides are kept)
Hide “3D Curve.17”
To Create a 3D Spline Curve:-
•
Click “Right VIew” icon
•
Click “3D Curve” icon
•
“Disable geometry detection”
•
Draw a curve with 3 control points as shown
•
Click ok to complete
•
Similarly, draw another 3D spline curve.
Modeling
Netsurface.1
3D Curve.17
draw
draw
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 74
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Cut a surface by a curve (not on the 
surface):-
•
Click “Break Surface or Curve” icon
•
Select “Break Surfaces by Curves” as Type
•
(Click “Right View” icon)
•
Select “Along Compass” as direction
•
Select the two surfaces       as Cut
•
Select the “3D curve.18” as Cutting
•
Click on the portion to remove
•
Click Apply
•
Click ok to complete
•
Click “Break Surface or Curve” icon again
•
Select the surface       as Cut
•
Select the “3D curve.19” as Cutting
•
Click on the portion to remove
•
Click Apply
•
Click ok to complete
Hide “3D Curve.18” & “3D Curve.19”
Modeling
3D Curve.18
3D Curve.19
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 75
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To create a Blend surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two surface edges
•
Disable “Project End points”
•
Change the continuities to Tangent
•
Drag the point        onto the point
•
Drag the point        onto the point
•
Click ok to complete
To make a Blend curve:-
•
Click “Freestyle Blend Curve” icon
•
Select the two surface edges
•
Change the continuities as shown
•
Click “Right View” icon
•
Adjust the tensions to match the image
•
Click ok to complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 76
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To create an Extrude surface:-
•
Click “Extrude” icon
•
Select the curve
•
Select “Normal to the curve” as direction
•
Drag the double arrow on the preview surface 
to the left, up to ~15mm
•
Click ok to complete
•
Hide the curve
To create a Blend surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two surface edges
•
Move the endpoint to the position
•
Change the continuities as shown
•
Adjust the tensions
•
Click ok to complete
Modeling
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 77
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To create a Fill surface:-
•
Click “Freestyle Fill” icon
•
Select the surface edges of the opening
•
Change the continuities as shown
•
Click ok to complete
Hide the Extrude Surface
To make a 3d curve:-
•
Click “Top View” icon 
•
Click “3D Curve” icon
•
Draw a curve with 2 control points as shown
•
Click “Front View” icon
•
Drag the two control points to match the image
•
Click ok to complete
Modeling
Top view
Front view
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 78
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To make a 3d curve:-
•
Click “Top View” icon 
•
Click “3D Curve” icon
•
Draw a curve with 2 control points as shown
•
Click “Front View” icon
•
Drag the two control points to match the image
•
Click ok to complete
To create a Blend Surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two 3D Curves
•
Click ok to complete
Make the nearby surfaces semi-transparent::-
•
Right-click on the surfaces
•
Select “Properties”, set Transparency to 50
•
Click ok to complete
Modeling
Top view
Front view
draw
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 79
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Modify a Surface by its Control Points:-
•
Click “Control Points” icon
•
Select the previous Blend Surface
•
Change Nu to 6; Nv to 5 (right-click on the number, 
then select on the list)
•
Right-Click the compass
•
Deselect “Lock Privileged Plane Orientation 
Parallel to Screen”
•
Select “Make XY the Privileged Plane”
•
Select “Normal to Compass” as Support (Pulling 
Direction)
•
Select “Linear” as Diffusion
•
Select “Convex Law” as Cross Diffusion
•
Click “Select all Points” icon             to activate all 
mesh points
•
Drag the first row upward 
Modeling
Drag 
upward
Linear relation
Convex relation
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 80
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
Cont’:-
•
Drag the first row upward to match the image 
(Right View)
•
Drag the second row upward to match the image
•
Click ok to complete
To create a Blend surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two 3D Curves
•
Click ok to complete
To Modify the Surface by its Control Points:-
•
Refer to previous pages
Modeling
Drag 
upward
result
Create a 
surface here
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 81
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Shorten surfaces:-
•
Click “Extend” icon
•
Click on “Surface32”
•
Drag on the green dot to shorten the surface by 
around 2mm
•
Click ok to complete
•
Similarly, Shorten “Surface33” by ~2mm
To Create a Blend Surface:-
•
Click “Freestyle Blend Surface” icon
•
Select the two surface edges
•
Change the continuities to Tangent
•
Click “Top View” icon
•
Adjust the tensions to match the image
•
Click ok to complete
Hide the two 3D Curves
Modeling
surface32
surface33
Create a blend 
surface here
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 82
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Extend surfaces:-
•
Click “Extend” icon
•
Click on “Surface32”
•
Drag on the green dot to extend the surface by 
around 5mm
•
Click ok to complete
•
Similarly, Extend “Surface33” and “Surface34”
by ~5mm
To Show a Selection Set:-
•
Select “Edit/ Selection Sets…” on the menu bar
•
Select “Wing” on the list
•
Click “Select” icon (all surfaces belonging to 
“Wing” will be selected)
•
Click “Hide/Show” icon to show
•
Click “Close”
Modeling
surface32
surface33
surface34
Selection Set “Wing”
is now visible
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 83
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
Tutorial 4C
To Make a Mirror:-
•
Click “Symmetry” icon
•
Select all Surfaces (visible)
•
Then click on “ZX plane” as Reference
•
Click ok to complete
(The resultant model should match the reference 
image of Front View, Right-View and Top View)
Save your File again 
Modeling
END of Tutorial 4C
Version 1a - Jan 08
By Dickson Sham (ME Dept, HKPU)
A- 84
CATIA V5R16 Freeform Surfaces – Rebuild P51 Mustang
For enquiries, please contact:
Mr. Dickson S.W. Sham
CATIA Certified Professional,
Department of Mechanical Engineering,
The Hong Kong Polytechnic University
Tel
: (852) 2766 4507
Email
: mmdsham@polyu.edu.hk
Website : http://myweb.polyu.edu.hk/~mmdsham