will do for real; now handling the special cases of plane against a
surface of extrusion. Still need to fix up line-surface
intersection to work for curved things, but then some simple curved
cases should work (as well as plane-plane).
[git-p4: depot-paths = "//depot/solvespace/": change = 1919]
way to think about the cases; I'm classifying the regions to the
left and right of each edge, and keeping the edges if those regions
(2d, surfaces) classify different.
Still screws up with edge-on-edge intersections; but if I make the
surface intersection stuff handle that, then might be more
straightforward to use that info.
[git-p4: depot-paths = "//depot/solvespace/": change = 1914]
segments in Boolean against the shell, not the intersection
polygon. (We just cast a ray, and use the surface-line intersection
function that already existed.) That's slow, but can be
accelerated later.
[git-p4: depot-paths = "//depot/solvespace/": change = 1911]
non-coincident faces. There's also a problem when I don't generate
the full intersection polygon of shell B against a given surface in
shell A; I need to modify the code to not require that.
[git-p4: depot-paths = "//depot/solvespace/": change = 1910]
trim curves for all surfaces lie between 0 and 1. And add routines
to merge the curves and surfaces from two shells into one, and to
split the trim curves into their piecewise linear segments and then
reassemble them into trim curves.
[git-p4: depot-paths = "//depot/solvespace/": change = 1905]
Add stubs for functions to perform Booleans, and get rid of mesh
stuff, including the kd tree accelerated snap to vertex (which
should not be required if the shell triangulation performs as it
should).
Also check that a sketch is not self-intersecting before extruding
it or whatever. This is dead slow, needs n*log(n) implementation.
[git-p4: depot-paths = "//depot/solvespace/": change = 1902]
Jonathan Westhues