// cut the portal into two portals, one on each side of the cut plane
//
ClipWindingEpsilon (p->winding, plane->normal, plane->dist,
- SPLIT_WINDING_EPSILON, &frontwinding, &backwinding);
+ SPLIT_WINDING_EPSILON, &frontwinding, &backwinding); /* not strict, we want to always keep one of them even if coplanar */
if (frontwinding && WindingIsTiny(frontwinding))
{