Workshop 6.3
CAD Repair
DesignModeler
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Workshop 6.3, CAD Repair
Workshop Supplement
• Project Page> Component Systems> Geometry
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Workshop 6.3, CAD Repair
Workshop Supplement
• Project Page> Component Systems> Geometry
b
RMB
a
• DM will Open. When prompted choose “mm” as the
length unit
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Workshop 6.3, CAD Repair
Workshop Supplement
1. Click File > Import External Geometry File and select test11.x_t to import
• The model comes in as a surface body. If you look closely you can see
that there are three areas with missing faces. If you switch to the
wireframe display (View > Wireframe), you will see that the edges of
the missing faces are highlighted in red
Wireframe View
Shaded Exterior with Edges
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Workshop 6.3, Automatic Surface Patches
Workshop Supplement
First fix the small hexagonal patch near the end of the cylinder:
2. Select the six edges from the Model View and select Tools > Surface Patch
3. Click on Apply in the Patch Edges entry box to select the 6 edges
4. Leave the Patch Method set to Automatic and Generate the patch
• Note that a smooth single surface is generated.
Before
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After
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Workshop 6.3, Second Automatic Patch
Workshop Supplement
Next fix the four-sided missing face near the base of the handle:
5. Select the four edges from the Model View and select Tools > Surface Patch
6. Click on Apply in the Patch Edges entry box to select the 4 edges
7. Leave the Patch Method set to Automatic and Generate the patch
– Note that again a smooth single surface is generated. In the Wireframe
view, note that the edges for the two missing faces that you’ve fixed with
patches are no longer highlighted in red.
Patch 1
Patch 2
Missing Face
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Workshop 6.3, Third Patch – Automatic
Workshop Supplement
•
The last area where faces are missing spans regions of two different curvatures and the automatic
method will have more difficulty filling it in smoothly. There are two missing edges in this last region.
8. Select the two missing edges from the Model View and select Tools > Surface Patch
9. Click on Apply in the Patch Edges entry box to select the edges
10. Leave the Patch Method set to Automatic and Generate the patch
– Note the ripples in the surface that’s created. In this case, the Natural Healing method was
chosen and the cylindrical surface curvature is not maintained.
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Workshop 6.3, Third Patch – Patch Healing
Workshop Supplement
11. Change the Patch Method to Patch Healing and Generate the patch
In this case, the patch is created based on the edges and neither curvature is
maintained. There is an apparent “divot” taken out of the model, although it is possible
that this is the correct reconstruction.
Neither curvature is respected by the patch
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Workshop 6.3, Surface Extension
Workshop Supplement
•
12.
13.
14.
The use of the Surface Extension tool can lead to a better quality fix for the missing faces:
Delete the Surface Patch you created for this face
Select the shorter edge for the missing face and select Tools > Surface Extension
Set the Extent Type to Natural and set the Extent to Fixed with a value of 50 mm. Click Generate to
extend the surface.
– Note that the missing bit of the end surface is restored and the extended surface stops at the
natural bounds of the face
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Workshop 6.3, Final Surface Patch
Workshop Supplement
•
With the missing bit of the end surface smoothly restored, an Automatic Surface Patch
can be used to restore the final missing face:
15. Select the two edges of the missing face from the model view and create a Surface Patch
with the Method set to Automatic. Click Generate.
– Note that a smooth surface is created which follows the curvature of the cylinder
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Workshop 6.3, Sew Body Operation
Workshop Supplement
• Although there are no longer any missing faces, the model still consists
of a single surface body
• Since the body encloses a volume, it can be converted to a solid using
the Sew Body Operation
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Workshop 6.3, Sew Body Operation
Workshop Supplement
16. Select Create > Body Operation
17. Select the Body
18. Set the Type to Sew and set the Create Solids?
toggle to Yes
19. Click Generate to convert the Surface Body to a
Solid
– Note the change in the Model Tree
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