3D sphere tangent to four triangles

Ray Jones thouis at graphics.lcs.mit.edu
Fri Feb 7 12:49:23 PST 2003

I'm looking for a discussion (or decipherable code) for finding the
set of spheres tangent to four triangles.  

I imagine the straightforward way to do this is to iterate over the
corners (points), edges (lines), and interior (plane) and find a
sphere tangent to four such elements, one from each triangle.  But I
haven't found a description of the solution to this subproblem,

Ray Jones

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