message: Quads ptex improvements.  Looks fairly correct on kava leaves.
  # Conflicts:
  #	ospray/render/scivis/SciVisRenderer.ispc
diff: @@ -66,6 +66,15 @@ vec4f SciVisRenderer_computeGeometrySample(SciVisRenderer *uniform self,
  shadeMaterials(dg, info);
  + foreach_unique(material in (SciVisMaterial*)dg.material) {
  + if (material->ptexFilter) {
  + info.Kd = info.Kd * evalPtexFilter(material->ptexFilter,
  + ray.primID,
  + make_vec2f(ray.u,ray.v));
  + }
  + }
  +
  +
  info.local_opacity = path_opacity * info.d;
  if (info.local_opacity > self->super.minContribution) { // worth shading?
  