I have to write a SolidWorks addin where the user can set textures that are mapped to ERP articles. In my case it is important that the direction of the texture is displayed correct ( wood materials ).

So, the user should select the face where the rendermaterial should be added and the edge where the direction of the texture should relate.

I can rotate the texture via rendermaterial.RotationAngle but how do i get the angle between the texture direction and the edge direction ?

Any ideas ?