message: Don't use transmission factor for scaling
  Rely on fresnel equations and IOR instead
diff: @@ -89,7 +89,7 @@ using viewer_type = viewer_glut;
  // support for emissive objects
  //
  -#define USE_PLASTIC_MATERIAL 1
  +#define USE_PLASTIC_MATERIAL 0
  //-------------------------------------------------------------------------------------------------
  @@ -815,7 +815,7 @@ int main(int argc, char** argv)
  glass<float> gl;
  gl.ct() = from_rgb(mat.cd);
  - gl.kt() = mat.transmission;
  + gl.kt() = 1.0f;
  gl.cr() = from_rgb(mat.cs);
  gl.kr() = 1.0f;
  gl.ior() = from_rgb(mat.ior);
  