Merge the four faces belonging to a tetrahedron

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Chenglin Li
Chenglin Li 2023-3-23
编辑： Matt J 2023-3-28
Hi,I have the element information of a mesh
but the mesh is too sparse. I extract all the faces of the mesh element and apply loop refinement for encryption
loop refinement extracts the midpoint of each face and generates a new triangle
but only generates a three-dimensional matrix
How do I merge the faces of a three-dimensional matrix into a new tetrahedron by index？

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Matt J
Matt J 2023-3-23
编辑：Matt J 2023-3-23
The process you've described doesn't uniquely determine what the new tetrahedron decomposition should be. However, you could use delaunayn on your augmented list of vertices (the original vertices plus the new ones) to generate one possible decomposition.
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Chenglin Li
Chenglin Li 2023-3-28
But now that I've refined the tetrahedron and generated the new triangle, do I need this function?
Matt J
Matt J 2023-3-28
编辑：Matt J 2023-3-28
You've added new vertices, but the vertex connection list has not been revised to form new, smaller tetrahedrons. delaunayn will do that.

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