Im currently carrying out a project where one task requires that i calculate the surface normal of a face from a shape selected by the user. The shape may be rotated/translated/etc before picking. To do this i want to be able to pick a face, return 3 of the vertices making up the corners of the face (in anti-clockwise or clockwise) and calculate the faces normal via Cramers rule. So far i know how to register picks which return a single vertex on the surface of a picked face (via a pick ray) but iam having trouble accessing the geometry of the shape to find the vertices i require.
I was wondering if any one knew how i could return a list of vetices which make up the face i select. I know how to use PickIntersection to return a GeometryArray but at the moment i cant seem to find a way to extract the info that i want (im not even sure if im even using the correct approach).
Any help would be welcome,
Darren
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