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The following mesh is created by converting a curve with bevel effect like below:

enter image description here

The mesh has some faces which extrude into the inside of the shape. This effect can be seen by cutting the mesh into halves (using boolean modifier):

enter image description here

If I want to get rid of the internal faces and only retain the outside faces which can be seen from this graph, what is the best way to achieve that without too much manual work? (I have a lot of characters to deal with, so I am seeking an automatic way)

enter image description here

I have tried clean the mesh up and use "Intersect (Knife)", but that does not do the job cleanly. It still misses some faces and leaving them extruded inside the shape. Basically I only want to keep the contour of the mesh.

Attached a blender file for demo.

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  • $\begingroup$ your topology seems a bit crazy, are you sure you've chosen the best possible topology to build your object? $\endgroup$ – moonboots Nov 5 '18 at 14:21
  • $\begingroup$ The topology is created simply by beveling a curve of a letter. What are some other alternatives to achieve the same effect? I am only concerned with getting the "outside crust" $\endgroup$ – WawaBrother Nov 5 '18 at 23:29
  • $\begingroup$ could you please show a picture or a drawing of the shape you want? $\endgroup$ – moonboots Nov 5 '18 at 23:35
  • $\begingroup$ The last picture is what I want, but with all the faces underneath the surface removed $\endgroup$ – WawaBrother Nov 6 '18 at 4:40
  • $\begingroup$ so you could select the faces you want to keep with the lasso, then inverse the selection with ctrl i, and delete, all the invisible faces will be deleted, does it work? $\endgroup$ – moonboots Nov 6 '18 at 8:35
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Shrinkwrap is actually the best way I can found and it works pretty well. Comparing to the heightmap approach talked about here BlenderExchange, the shrinkwrap approach is easier to operate and involves less processes.

Here is how I do it, first create a plane mesh over the beveled object, subdivide the surface with 30 slices:

![image|690x473](upload://qA7NklU4vR5BkVgdaNUDj1rjehq.png)

Add subdivision surface and shrinkwrap modifiers. The subdivisions need to set to 4 or 5. The mode of the shrinkwrap need to be "Project" (You might need to turn on "Negative" if "Positive" doesn't work.)

![image|690x413](upload://50My2LsquPzNMTgz0iYbsBLM4Wa.png)

Apply the modifiers and edit the mesh. To do this easily, go to a side view and box select the vertices on the top layer, remove the vertexes:

![image|668x500](upload://vleYQjJtkj3z8yxdQbVjECQONbr.png)

Then you get a beautiful top contour without internal intervening faces:

![image|690x447](upload://mWVBfgiIlK3sCmJFgAuHVb35n4q.png)

The shape will have more details then necessary. Use limited dissolve to fix that

![image|570x500](upload://wiy6SAKTpNAntLsF6ebwfakBZR9.png)

End result:

enter image description here

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