left_xform.transform(im_vec[1]); canvas.getVworldProjection(left_xform, right_xform); left_xform.transform(im_vec[0]); left_xform.transform(im_vec[1]);
left_xform.transform(im_vec[1]); canvas.getVworldProjection(left_xform, right_xform); left_xform.transform(im_vec[0]); left_xform.transform(im_vec[1]);