A mesh is simply a way of storing many triangles more efficiently.
Instead of #declaring a union of triangles, and having each copy use as
much memory as is needed to store the triangles(which can mean a lot of
memory with many triangles) you #declare a mesh, and copies of that mesh
only use enough memory to refer to that mesh.
In other words, a mesh is simply a union customized for storing large
numbers of triangles.

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