theorem; it's evaluated as a surface integral over each triangle.
And don't regenerate the emphasized edges unless we have to;
specifically, don't do it when the only dirty group is the
drawing group.
[git-p4: depot-paths = "//depot/solvespace/": change = 1849]
as the difference between the cosines of the two angles. All of the
angle stuff generates huge expressions (Expr *), but doesn't seem
noticeably slow.
[git-p4: depot-paths = "//depot/solvespace/": change = 1847]
where it was, move the export (DXF, PNG, STL) stuff to export.cpp,
and move the regen/solve stuff to generate.cpp.
[git-p4: depot-paths = "//depot/solvespace/": change = 1825]
Jonathan Westhues