This is my first post on these news groups so I'm unsure of the 
prevailing etiquette here, and how strictly it is observed.   I 
apologize in advance if I have violated the rules by posting a text 
request for help, image, and some source text in the same message/group.

I've been trying to make my first scene using primarily the POV SDL.  
The initial scene and some of the objects were modeled in Moray.  
Rendering has been done using MLPOV V0.81 (for HDR image support).

What has me perplexed is the exact effect and relation between the 
<rgbf> color in the 'pigment' section and fade_color and such in the 
'interior' section.  Here are the material definitions for the wine and 
the glass:

#declare winered = 
   material  // winered
   {   
      texture
      {      
         pigment
         {
            color rgbf <0.3, 0.0, 0.0, 1.0>
         }      
         finish
         {
            ambient 0.1
            diffuse 0.1
            phong 1.0
            phong_size 100.0
            specular 0.8
            roughness 0.0003
            reflection 0.1
         }
      }   
      interior
      {
         ior 1.45
         fade_distance 100.0
         fade_power 1.0
         fade_color <1.0, 0.0, 0.0> 
           }
   }

#declare Crystal_1_1_1 = 
   material  // Crystal_1_1_1
   {   
      texture
      {      
         pigment
         {
            color rgbf <.98, .98, .98, .9>
         }      
         finish
         {
            ambient 0.0
            diffuse 0.1
            phong 1.0
            phong_size 100.0
            specular 0.8
            roughness 0.0003
            reflection 0.1
         }
      }   
      interior
      {
         ior 1.45
         fade_distance 10.0
         fade_power 1.0
         fade_color <0.98, 0.98, 0.98> 
              }
   }


I think I've read most of the relevant documentation, and I'm still not 
100% sure if what I'm trying to do can be done with POVRay or not.  I'm 
trying to get a colored shadow cast by the wine in the glass.  So far I 
haven't been able to get anything but a gray shadow.

I've also tried photons to get a colored caustic but that hasn't worked 
out either.  I think my problem with the photons is that I only want a 
caustic from the wine and not the glass, but the wine is inside the 
glass, and I suspect that the glass is blocking the photons.  I put a 
photon block in the glass object (also added a global photon block and a 
light source photon block of course) with a 'pass_through' in it, but it 
still didn't look like it was working correctly.  

I'd appreciate any advice or suggestions anyone might have, either 
related to the problem mentioned above or just general comments and 
ideas.  To give a better idea of what the scene looks like right now 
here is an image from render I did with radiosity, but no photons. 

Thanks.

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