message: Calculate filter width from tile size
diff: @@ -33,6 +33,9 @@ inline vector<4, unorm<8>> tex2D(PtexPtr<PtexTexture> const& tex, coordinate<flo
  Ptex::PtexFilter::Options opts(Ptex::PtexFilter::FilterType::f_bspline);
  PtexPtr<Ptex::PtexFilter> filter(Ptex::PtexFilter::getFilter(mutable_tex.get(), opts));
  + auto face_data = mutable_tex->getData(coord.face_id);
  + auto res = face_data->res();
  +
  vec3 rgb;
  filter->eval(
  rgb.data(),
  @@ -41,10 +44,10 @@ inline vector<4, unorm<8>> tex2D(PtexPtr<PtexTexture> const& tex, coordinate<flo
  coord.face_id,
  coord.u,
  coord.v,
  - 1.0f,
  + 1.0f / res.u(),
  0.0f,
  0.0f,
  - 1.0f
  + 1.0f / res.v()
  );
  return vector<4, unorm<8>>(rgb.x, rgb.y, rgb.z, 1.0f);
  