3D Voronoi substraction with original MESH...

Replies to This Discussion

Permalink Reply by Luca Borro on February 22, 2015 at 8:46am

Thank you so much! This is what I looking for!

I've another question:
I noted that you use MESH BREP. I use only MESH (non MESH BREP). My mesh is an .stl file that arrives from anatomical bioimages.
In this case how can I set the intersection from Vronoi CELLS and ORIGINAL MESH (.stl)?

I try to replace MESH in place of your MESH BREP but does not work. 
Thank you again.

Luca

Permalink Reply by Luca Borro on February 22, 2015 at 12:23pm

Remove edges manually is a big problems for me with bones structure.
And If I convert MESH in NURBS (with Reverse Engeneering Operation)?
If I convert mesh in nurbs is it possible to extract edge?
I'm sorry but I'm not a great expert on parametric modeling.

Permalink Reply by peter fotiadis on February 22, 2015 at 12:36pm

OK, POST these @%$@% bones or some of them  (a skull could be rather OK, he he) and we'll see what we can do.

To clarify: you need an "outline" (so to speak) from these ex breps (and now meshes), right? Like being  "on-line" with MESHLAB and doing the magic (if it's doable). AGAIN: this is "doable" working with the ex Voronoi brep planar faces (that now consist from many quads/triangles because that's the way that a mesh works).

I have a feeling that this is a quite challenging issue - but if no solution could be around you could try MESHLAB (it's free) against your mini bones (mini meshes actually).

Permalink Reply by Kim hauer on February 22, 2015 at 6:37pm

Meshlab is a very sophisticated program, it can also take as much time to learn as Grasshopper.

Meshlab can create random Voronoi holes in any mesh, should one chose not to use Grasshopper.

In the attached pic the selected mesh was perforated with holes, you have control over hole quantity and hole size, via random parameters, that will occupy the surface of the mesh.

Attachments:

• drumstick.PNG, 530 KB

Permalink Reply by Luca Borro on February 23, 2015 at 1:35am

Sorry but my english is not good and then I'm afraid of not being able to express myself well.

The MESH model on which I work is this:

The model inside is semi-empty.

Inside there is a dense network of trabeculae like this: http://www.medicitalia.it/public/uploadedfiles/minforma/mannino.mar...

I want to recreate trabeculae with 3D Voronoi. So, i try to re-explain what i need.

I need:

• Create 3D Voronoi ONLY inside the MESH;
• Delete all 3D Voronoi cells (face, edge, point) outside the mesh;
• Extract the edge of the 3D Voronoi that I created inside MESH.
  
  

(These extractst edge I need for make trabeculae with Wavebird plugin.)
 

I do not need:

• Extract the edge on surface of MESH rather I want to delete the edge of voronoi that are on surface of mesh!

Thanks

Luca

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