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Old 9th December 2013, 11:21 PM   #1
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Join Date: Nov 2007
Posts: 139
Default Plug-in features for 3-d print modeling

Lately I've been thinking about some features it would be great to have in AC3D to help in preparing models for 3D printing:
  • Better extrude by normal. I roughed some math in pseudo code on this thread that keeps the new surface parallel to the old surface so the extrusion distance is more exact.
  • Water tight test. I believe ensuring every edge is shared by exactly two edges is a simple test of water tightness. Perhaps the plug-in could change leaky surfaces to a specified material. A brief look through the SDK makes me think this is already 95% done in AC3D.
  • Consistent normals. Once we've achieved every edge being shared by exactly (one or) two vertexes, I think if we test the edges to ensure one goes from V0->V1 and the other goes from V1->V0 we can know the normals are consistent.

I am hoping to gain some free time in the near future to work on these things. If someone would like to step-up to mentor my on the internals of AC3D, that would be great.

There are also some things I don't have an idea how to solve:
  • Self-intersection test. Testing to make sure no surfaces intersect each other.
  • Wall thickness test. The 3D print service I've been using has minimum required wall thicknesses.
  • Object volume. The 3D print service I've been using also charges by the cubic centimeter, so it would be nice to figure out how much a model would cost before I upload it.
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