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.
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
Build a graph from a list of nodes uniquely identified by keys, with a list of keys of nodes this node should have edges to. The out-list may contain keys that don't correspond to nodes of the graph; they are ignored.
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