Creating modified cavities in 3D models.
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The only difference is I wish to have more control over the size of the cube and sphere, possibly add multiple, and control the location of the sphere within the 3D space, is any/all of this possible?
3 个评论
darova
2020-6-15
Can you make a simple sketch of desired result? Did you try sphere?
Luke Benham
2020-6-15
Nathan Welch
2020-6-30
I'm having a similar issue that I posted here
However, I wish to mesh the internal cavity and include it in my model. So the cavity mesh must match up with the body mesh, i.e. same nodes and same faces at the interface surface.
Is this possible in MATLAB? The example that you reference above does something close but it isn't very good as the 'mesh' that is used to model the spherical cavity is just a set of terrible tetrahedrals not a delaunay type mesh.
I know about other meshing softwares, GMSH etc, but I want something in MATLAB (even if I have to write it myself) as I need to do a lot of optimisation and solving PDEs, whilst updating meshes and carrying out incremental alterations - rather than entirely recreating them. My BIG stumbling block is just getting even a basic, terribly performing discretization method for an arbitrary geometry.
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ADSW121365
2020-6-15
编辑：ADSW121365
2020-6-15
0 个投票
All of this is definitely possible, but the inbuilt CAD capabilities/geometry design in MATLAB aren't its strongest point.
From experience complicated geometries generally fall into two catagories for use in the toolbox:
- Direct Geometry Design Inside an external mesh generator: See a question I asked for nested cubes on stackexchange here. GMSH is free, robust, has inbuilt optimisation and isn't too hard to learn, though finding anything in the documentation is long. There are many other mesh generators, but GMSH also has a direct export to a .m file for MATLAB.
- CAD Design & Creation of an STL/BREP/STEP file depending on the geometry, subsequent external meshing then importing to MATLAB. Some questions I've answered on this forum which maybe helpful to this approach can be found here and here
Edit: The approach via alphashapes mentioned in the comments is actually really good for this type of problem and worth considering.
4 个评论
Luke Benham
2020-6-15
ADSW121365
2020-6-15
My recommended route is via geometryfrommesh, that way you can design everything in CAD seperately.
It is almost certainly possible to setup the same thing with alphashapes, but you mentioned a need for flexibility - more cavities, moving the cavities, maybe different shaped cavities would be a feasible extension and my experience suggests in the long run using CAD will probably save you time and give you access to boolean operators and the like which give you much more flexibility in your geometry design.
So my current work for example looks at a nested 3D domain which contains 20 internal subdomains (some with their own internal divisions), the toolbox can handle this happily when using geometryfrommesh, but I haven't found another approach which supports subdomains in the same way (though the addFaces feature released in 2020a probably helps).
Luke Benham
2020-6-15
ADSW121365
2020-6-15
The approach suggested is actually really good - I'm thinking too generally, the CAD approach allows a drag-and-drop type approach to geometry design which is probably more beneficial when you wish to consider complicated embedded stuctures.
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