/* Add special clipping plane to projection */
v4f surface;
q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
surface[3] = v3_dot( surface, gate->co[1] );
/* Add special clipping plane to projection */
v4f surface;
q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
surface[3] = v3_dot( surface, gate->co[1] );