}
static int dl_compare(const void *tav, const void *tbv) {
+ int i;
const Triangle *const *tap= tav, *ta= *tap;
const Triangle *const *tbp= tbp, *tb= *tbp;
- double za= ta->vertex[0][2];
- double zb= tb->vertex[0][2];
+ double za=0, zb=0;
+ for (i=0; i<3; i++) {
+ za += ta->vertex[i][2];
+ zb += tb->vertex[i][2];
+ }
return za > zb ? -1 :
za < zb ? +1 : 0;
}