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[chrism <>]

I need to apply a rotation to each triangle in my Delauny (2D) triangulation.
To do this, I calculate the rotation to move each triangle's vertex into the
new coordinate system. Because I need to perform triangle-triangle
intersection in this new coordinate system I need to update the x,y,z values
at each vertex to the new x',y',z' values. Critically though, I need to
maintain the triangles (despite the fact they will no longer be Delaunay) --
therefore removal/insert doesn't work.

Therefore, what would be the best way forward to modify the vertex's x,y,z
values?

 Ideally I'd do something like:

Delaunay prj(original_tri);
    for (triangulation::Finite_faces_iterator fit =
prj->finite_faces_begin(); fit != prj->finite_faces_end(); ++fit)
    {
        //interpolate the station data to the current element
        triangulation::Face_handle face = fit;

        vert(0) = face->vertex(0)->point().x();
        ver(1) = face->vertex(0)->point().y();
        vert(2) = face->vertex(0)->point().z();

        rot_vert = rotation(vert);
        face->vertex(0)->set_x(rot_vert(0));
        face->vertex(1)->set_x(rot_vert(1));
        face->vertex(2)->set_x(rot_vert(2));


.....


Thanks.



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