Hello,
I am trying to cut out a 3D mesh of a lattice structure using the “mesh trim” tool. My end goal is to have cut out a 3D mesh in the shape of a cylindrical disk with a defined diameter and thickness. I have attached my Rhino 3D model. I have tried to setup a 2d circle curve but not sure how to setup it up properly. I am curious what would be the best method to achieving this?
Thanks!
Daniel
Lattice Structure.3dm (899.0 KB)
Oh perfect! I gave it a try and was able to get a similar result. Thanks so much!
Hi ferry59,
I was attempting to use MeshBooleanDifference again and I seem to be running into issues with my resulting mesh. For some reason the object is not a complete solid, like it’s giving me the opposite result I desire compared to your shared image. Do you have any tips or general steps I should follow to ensure I get the right 3D mesh cut? I attached my slightly modified mesh/model again. Lattice_updated.3dm (1.0 MB)
Thanks,
Daniel
Hi Daniel,
no Problem here, file is attached, witch Rhino version are you working with?
Regards
Ferry
Thanks Ferry, appreciate it! I am using Rhino 7.
One thing I notice is whenever I’m trying to do a solid cylinder it doesn’t create a solid texture like on yours. Is this a version difference?
http://docs.mcneel.com/rhino/7/help/en-us/commands/gumball.htm
Try extrude handle nr. 13 on a circle, select the surface, then type cap 
Hi ferry,
Hope you are doing well. Sorry for the late reply but I eventually was able to get meshbooleandifference to work using the gumball tool, cap, and steps involving the solid part and mesh with my lattices.
This time I modified my lattice structure features and attempted the same exact steps. Frustratingly, meshbooleandifference is not giving me the inner features. I attached my new file with a similar shaped lattice with the results I got. Would you happen to have any tips or check if the method work on your end so I’m not going crazy? 
Also for some reason I get inconsistent results with meshbooleandifference sometimes where I have to make copies of the solid or mesh for it to work. Have you encountered this as well?
Thank you!
Daniel
CubicLattice_Troubleshoot.zip (9.2 MB)
Hi Daniel,
there are many reasons why boolean-operations fail. So far I could use MeshBooleanIntersection successfully, didn’t try others because as you know: this takes time…
Search in this forum, there are many topics about this and many tipps from people more with a lot of experience.
One little hint maybe: The polysrf in your file tries to cut the mesh exactly at top and bottom where many mesh-edges are settled on. BUT: maybe not exactly - maybe their z-values differ a tiny little bit, smaller then can be computed. So moving the polysrf for about 0.1 units might improve the results.
Good luck
Ferry
Thank you for you quick reply ferry! I really appreciate you helping me out in the initial stages. I’ll go about asking others on this forum and see what their opinions are on the matter.
Daniel
