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how to project vertex along a tangent
Hi, I want to project a vertex along its tangent and figure that the vertex normal would be the tangent I would like to use to project the vertex along it so that I can increase or decrease the vertices distance from the origin. The assumption is that the vertex I want to project is not set at the origin. For, instance, if I were to select any vertex on a sphere, how could I then project the vertex along its tangent. Thanks for any help. Rob.