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SubDEdgeTag

SubDEdgeTag enum

ON_SubDEdgeTag identifies the type of subdivision edge. Different tags use different subdivision algorithms to calculate the subdivision point.

Derived Classes:

Namespace: Rhino.Geometry
SubDEdgeTag: references

Values (4)

Unset = 0

Not a valid edge tag and the default value for ON_SubDEdge.m_edge_tag. This encourages developers to thoughtfully initialize ON_SubDEdge.m_edge_tag. or use ON_SubD.UpdateAllTagsAndSectorCoefficients() to automatically set the m_edge_tag values at an appropriate time.

Smooth = 1

At least one the edge's vertices must be tagged as ON_SubDVertexTag::Smooth. The edge must have exactly two faces. The edge's subdivision point is (A1 + A2 + S(f1) + S(f2))/4, where Ai = ON_SubDEdge.Vertex(i)->ControlNetPoint() and S(fi) = ON_SubDEdge.Face(i)->SubdivisionPoint().

Crease = 2

Both of the edge's vertices must be tagged as ON_SubDVertexTag::Dart, ON_SubDVertexTag::Crease, or ON_SubDVertexTag::Corner. (The vertex tags can be different.) The edge can have any number of faces. The edge's subdivision point is (A1+A2)/2 where Ai = ON_SubDEdge.Vertex(i)->ControlNetPoint().

SmoothX = 4

This tag appears only on level 0 edges that have exactly two neighboring faces and both of the edge's vertices are tagged as ON_SubDVertexTag::Dart, ON_SubDVertexTag::Crease, or ON_SubDVertexTag::Corner. The level 1 subdivision point for a level 0 edge tagged as ON_SubDEdgeTag::SmoothX is the standard smooth edge subdivision point. When subdivided, the new subdivision vertex will be tagged as ON_SubDVertexTag::Smooth and the subdivided edges will be tagged as ON_SubDEdgeTag::Smooth. The tag ON_SubDEdgeTag::SmoothX can only appear on a level 0 edge. This tag exists because the ON_SubD subdivision algorithm requires any edge with both end vertices tagged as not smooth must be subdivided at its midpoint. Sector iterators treat "SmoothX" edges as smooth. Both edge m_sector_coefficient[] values must be set so the smooth subdivided edges will be valid.

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