Variable t8_eclass_face_orientation

Variable Documentation

const int t8_eclass_face_orientation[T8_ECLASS_COUNT][T8_ECLASS_MAX_FACES]

Each face is either 0 or 1 oriented, depending on the order of its vertices.

We say a face is 0 oriented, if its normal vector points inwards, 1 oriented otherwise. The normal vector is computed as the cross product of v_1 - v_0 and v_2 - v_0. v_i being the i-th vertex. The faces of an eclass of dimension 2 or lower are all 0 oriented. Invalid values return -1.