Hollow out 3D meshes by this tool? about sdfx

[deadsy]

The function you are looking for is sdf.Offset3D()
You can see an example of it's use in ./examples/offset_box.
Note that the "hollowing out" operation just occurs on the SDF. It has nothing to do with the source being an STL.

Pseudo code is something like:

s0 := ImportSTL("file.stl)
s1 = Offset3D(s0, thickness)
s2 := Difference3D(s0, s1)
Render(s2)

[Megidd]

Thanks @deadsy I'm going to try it. Probably I'll be back with some questions 🙂

[Megidd]

Conclusion

PR #54 introduces an example to carve out the inside of the input STL surface mesh. The corresponding comments of PR #54 should be noted.

So, steps 1 and 2 of this algorithm can be done by this package:

1. Represent the original 3D surface mesh by signed distance field - SDF.
2. Extract an internal iso-surface from SDF. It's inside the original surface mesh.
3. Flip the normal vectors of the new internal iso-surface.
4. Merge new internal iso-surface with the original external surface mesh.

Steps 3 and 4 are trivial.