double MergeSearchTolerance
Edges are considered as potentially the same if their midpoints are within this distance. Due to floating-point roundoff this should be larger than MergeVertexTolerance. If zero, we set to MergeVertexTolerance*2
double MergeSearchTolerance
Edges are considered as potentially the same if their midpoints are within this distance. Due to floating-point roundoff this should be larger than MergeVertexTolerance. If zero, we set to MergeVertexTolerance*2