In some edge configurations two 'terminator' vertices (at the end of open bevel edge paths) are directly connected by a non-bevel edge that we will "open", and this creates a quad-shaped hole instead of a triangle-shaped hole (which was already handled). Detecting this case will arise is simpler before we change the topology, so it is done in BuildVertexSets(), stored in FBevelVertex::ConnectedBevelVertex, and used during mesh generation to call new AppendTerminatorVertexPairQuad function.
In BuildTerminatorVertex(), the search for a terminator split-edge may fail if the filtered triangle list ends up non-contiguous, preventing the vertex from being beveled (ie it is "stuck"). Code was added to both handle that case, and also try to force the list to stay contiguous.
#rb jimmy.andrews
#preflight 6319fbe3304480f8f8565048
#jira UE-160073
[CL 21908190 by ryan schmidt in ue5-main branch]
GeometryProcessing: add support for beveling the border ring(s) of a triangle or polygroup-face selection. Improve polygroup assignment around bevel loops, previously the entire loop received a single polygroup which is not what the user expects in polygroup-modeling. Now a new polygroup is assigned for each unique group-edge-pair. Terminator vertices now also generate a new polygroup if there are 2 or more adjacent groups, previously behavior (assigning to arbitrary nbr) was not useful during polygroup-edting.
#rb rinat.abdrashitov
#rnx
#jira none
#preflight 6193ddccb32bbfdc50d9ed07
#ROBOMERGE-AUTHOR: ryan.schmidt
#ROBOMERGE-SOURCE: CL 18208908 in //UE5/Release-5.0/... via CL 18209386
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Staging -> Release-Engine-Test) (v895-18170469)
#ROBOMERGE[STARSHIP]: UE5-Main
[CL 18209422 by ryan schmidt in ue5-release-engine-test branch]
Add test coverage for polygon triangulation functions to ensure they create triangulations with the expected orientations
#jira UE-133286
#rb rinat.abdrashitov
#rnx
#preflight 6181fc82612e950001c9b4ee
#ROBOMERGE-AUTHOR: jimmy.andrews
#ROBOMERGE-SOURCE: CL 18032811 in //UE5/Release-5.0/... via CL 18032831
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Staging -> Release-Engine-Test) (v885-17909292)
#ROBOMERGE[STARSHIP]: UE5-Main
[CL 18032838 by jimmy andrews in ue5-release-engine-test branch]
