this fixes an ensure on trying to place a new modeling tools primitive mesh in a level when a volume is in the level and volume snapping is enabled
#rb david.hill
[CL 29615343 by jimmy andrews in ue5-main branch]
- Fix conversion sometimes making degenerate tris and firing an ensure.
- Fix volume conversion sometimes creating cracks in volumes when dealing with non-convex faces (by deleting necessary colinear verts)
- Make simplification preserve group boundaries when asked.
- Remove colinear verts along group boundaries without losing boundaries when preserving groups.
- Break up faces that have holes into convexes rather than emitting per-triangle faces.
- Make mesh to volume tool use same path for conversion as tool targets, and add controls for preserving groups and simplifying
- Revert to ear clipping if delaunay triangulation fails in converting back from volume
#rb Jimmy.Andrews
#jira UE-173272, UE-152032
#prelfight 6470ccbf5b1dc793b715d66b
[CL 26002669 by semion piskarev in ue5-main branch]
(+ for code that was passing false then manually applying the same logic, remove the extra reverse orientation logic)
#rb david.hill
#preflight 630d245fe352708d44f9e007
[CL 21706500 by Jimmy Andrews in ue5-main branch]
