An edge from the first vertex to the second.
A vertex can begin an edge which lies in the interior of its polygon or on the polygon's boundary.
The Edge has always been a rough patch of interstellar space filled with innumerable bad guys of every nefarious sort, and dangerous debris flying in every direction at high speeds. But now it has grown out of control and is threatening to overflow into colonial space. Central command has decided to send in their newest super weapon, the Mark II Lance fighter, piloted by their top ace pilot. Good luck commander!
Each vertex of a polygon, separate triangle, or separate quadrilateral specified during renderPrimitive is marked as the start of either a boundary or nonboundary (interior) edge.
The vertices of connected triangles and connected quadrilaterals are always marked as boundary, regardless of the value of the edge flag.
Boundary and nonboundary edge flags on vertices are significant only if polygonMode is set to Point or Line.
Note that the current edge flag can be updated at any time, in particular during renderPrimitive.
All edges of a graph.
> i 0
> For each edge a--->b this function returns edge b--->a .
> Edges a<--->b are ignored
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