164 static void Rotate3d(RotMat *rot, vector *vec) {  in Rotate3d()  argument
166     tmp.x = (vec->x * (rot->rx1) + vec->y * (rot->rx2) + vec->z * (rot->rx3));  in Rotate3d()
167     tmp.y = (vec->x * (rot->ry1) + vec->y * (rot->ry2) + vec->z * (rot->ry3));  in Rotate3d()
168     tmp.z = (vec->x * (rot->rz1) + vec->y * (rot->rz2) + vec->z * (rot->rz3));  in Rotate3d()
169     *vec = tmp;  in Rotate3d()
172 static void Scale3d(vector *scale, vector *vec) {  in Scale3d()  argument
173     vec->x = vec->x * scale->x;  in Scale3d()
174     vec->y = vec->y * scale->y;  in Scale3d()
175     vec->z = vec->z * scale->z;  in Scale3d()
178 static void Trans3d(vector *trans, vector *vec) {  in Trans3d()  argument
179     vec->x += trans->x;  in Trans3d()
180     vec->y += trans->y;  in Trans3d()
181     vec->z += trans->z;  in Trans3d()