Is it possible to construct a constrained tetrahedral mesh of a domain using Tetgen or similar software? What I mean by constrained is that there are some nodes or edges that are not free but are predefined by the user.
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$\begingroup$ Yes, all unstructured mesh generators (that are worth using) can generate constrained delaunay triangulations in 2d or 3d. I personally do not have experience with tetgen, but i have used gmsh successfully for this. $\endgroup$– Tyler OlsenJun 13, 2014 at 22:52
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Yes, I've used tetgen to do precisely this.
If you're filling a surface mesh, you'll have to generate facet triangulations first. Then you can decide whether or not you want a constrained or conforming tetrahedral mesh.
The result of either choice is described in better detail within the manual.
