v3_sub( src_verts[tri[1]].co, src_verts[tri[0]].co, ac );
v3_cross( ac, ab, tn );
+#if 0
if( v3_length2( tn ) <= 0.00001f )
continue;
+#endif
dst_indices[real_indices+0] = tri[0] + ctx->vertex_count;
dst_indices[real_indices+1] = tri[1] + ctx->vertex_count;