Function if

kernels/subdiv/patch.h:349–351

      }
#if PATCH_USE_GREGORY == 2
      else if (ty & CatmullClarkRing::TYPE_GREGORY_CREASES) { 
        assert(depth > 0); return GregoryPatch::create(alloc,patch,border0,border1,border2,border3); 
      }
#endif
      else if (depth >= PATCH_MAX_CACHE_DEPTH) {
        return EvalPatch::create(alloc,patch);