A touches edge B, but does not share a vertex with edge B, then
that's an intersection.
Adjust the ear clipping so that it generates strip-like
triangulations, not fan-like.
And rearrange deck chairs on the bridge-finding code, which is
still pathetically slow. It may not be possible to get reasonable
performance without kd tree type acceleration.
[git-p4: depot-paths = "//depot/solvespace/": change = 1901]
is O(n^2), not perfectly robust, and the bridge-finding code is
particularly bad. But it works, triangulates, and shouldn't ever
generate zero-area triangles like gl does.
[git-p4: depot-paths = "//depot/solvespace/": change = 1900]
from an extrusion, with piecewise linear trim curves for everything
(that are shared, so that they appear only once for the two
surfaces that each trims). No Boolean operations on them, and the
triangulation is bad, because gl seems to merge collinear edges.
So before going further, I seem to need my own triangulation code.
I have not had great luck in the past, but I can't live without it
now.
[git-p4: depot-paths = "//depot/solvespace/": change = 1899]
Jonathan Westhues