156     vector pnt, bln;  in ext_volume_texture()  local
257             pnt.x = ((ry->o.x + (ry->d.x * t)) - bx->min.x) / bln.x;  in ext_volume_texture()
258             pnt.y = ((ry->o.y + (ry->d.y * t)) - bx->min.y) / bln.y;  in ext_volume_texture()
259             pnt.z = ((ry->o.z + (ry->d.z * t)) - bx->min.z) / bln.z;  in ext_volume_texture()
262             scalar = xvol->evaluator(pnt.x, pnt.y, pnt.z);  in ext_volume_texture()
278                 N.x = (xvol->evaluator(pnt.x - ddt, pnt.y, pnt.z) -  in ext_volume_texture()
279                        xvol->evaluator(pnt.x + ddt, pnt.y, pnt.z)) *  in ext_volume_texture()
282                 N.y = (xvol->evaluator(pnt.x, pnt.y - ddt, pnt.z) -  in ext_volume_texture()
283                        xvol->evaluator(pnt.x, pnt.y + ddt, pnt.z)) *  in ext_volume_texture()
286                 N.z = (xvol->evaluator(pnt.x, pnt.y, pnt.z - ddt) -  in ext_volume_texture()
287                        xvol->evaluator(pnt.x, pnt.y, pnt.z + ddt)) *  in ext_volume_texture()