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Summary: Issue here most probably is that the start point in ray-casting is too far away from the mesh. As a result the triangle intersection code can sometimes miss the ray intersection. To solve this, we project the ray segment to the boundary of the root node. Reviewers: brecht, sergey, campbellbarton Reviewed By: brecht Maniphest Tasks: T37177 Differential Revision: http://developer.blender.org/D115