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You probably don't need to worry about the edge concept explicitly, in scene graphs. Any time that a parent object in the scene graph holds a reference to one or more children, that reference (pointer) is itself the connection that would be termed an "edge". It it is likely that the child also holds a reference back to the parent. These are just pointers. ...


It's hard to tell without source code but it looks like some triangles are overlapping one another: I'm guessing another issue is that segment A-B is not always considered the same as segment B-A and you end up with internally 2 different edges sharing the same points. Because the edge looks twice as thick on your screenshot Red & Blue are probably 2 ...

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