message: don't make tfcn in gensv::loadVolume go to actual 0
diff: @@ -245,7 +245,7 @@ namespace gensv {
  vec3f(1, 0, 0),
  vec3f(0.5, 0, 0)
  };
  - const std::vector<float> opacities = {0.0, 1.0};
  + const std::vector<float> opacities = {0.0001, 1.0};
  ospray::cpp::Data colorsData(colors.size(), OSP_FLOAT3, colors.data());
  ospray::cpp::Data opacityData(opacities.size(), OSP_FLOAT, opacities.data());
  colorsData.commit();
  