MG_TETRA(unsigned long num, MG_ELEMENT_TOPOLOGIQUE *topo, class MG_NOEUD *mgnoeud1, class MG_NOEUD *mgnoeud2, class MG_NOEUD *mgnoeud3, class MG_NOEUD *mgnoeud4, class MG_TRIANGLE *mgtriangle1, class MG_TRIANGLE *mgtriangle2, class MG_TRIANGLE *mgtriangle3, class MG_TRIANGLE *mgtriangle4, int origine)