It was a regression introduced in rev36301. Average normal calcilation
used to fail due to triangular faces which are too slight.
Do not use triangles with too small area for average normal calculation.
vlr->v3= RE_findOrAddVert(obr, startvert+index[2]);
vlr->v4= NULL;
- normal_tri_v3(tmp, vlr->v3->co, vlr->v2->co, vlr->v1->co);
- add_v3_v3(n, tmp);
+ if(area_tri_v3(vlr->v3->co, vlr->v2->co, vlr->v1->co)>FLT_EPSILON) {
+ normal_tri_v3(tmp, vlr->v3->co, vlr->v2->co, vlr->v1->co);
+ add_v3_v3(n, tmp);
+ }
vlr->mat= matar[ dl->col ];
vlr->flag= 0;