VectorSet(temp, cl.cmd.cursor_screen[2] * 1000000, cl.cmd.cursor_screen[0] * -r_view.frustum_x * 1000000, cl.cmd.cursor_screen[1] * -r_view.frustum_y * 1000000);
Matrix4x4_Transform(&r_view.matrix, temp, cl.cmd.cursor_end);
// trace from view origin to the cursor
VectorSet(temp, cl.cmd.cursor_screen[2] * 1000000, cl.cmd.cursor_screen[0] * -r_view.frustum_x * 1000000, cl.cmd.cursor_screen[1] * -r_view.frustum_y * 1000000);
Matrix4x4_Transform(&r_view.matrix, temp, cl.cmd.cursor_end);
// trace from view origin to the cursor