Sorry. I see Mike Williams has answered better anyhow and I didn't see his 
reply before. I almost suggested HF.

I mistakenly thought it would be simple to use an image file for media 
density and yet it's relegated to needing to be in df3 format applied via 
'density_file'. My lack of using POV-Ray lately is making it difficult to 
discuss the program anymore! But I'll get by okay.  ;^)

Bob Hughes

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