Sorry, yesterday I addressed the general question of the possibility of 
CSG operations with media and not your special example. Now reading 
Alains post, I think your actual problem has nothing to do with media at 
all, but with the way POV handles textures in case of a CSG difference. 
May be sections 3.6.1.9 and 3.6.1.10 in the docs about interior and 
cutaway textures solve your special riddle since the default of an 
undefined texture is black as is your background. In your case the 
texture of the subtracted second box is undefined as well as the 
interior/cutaway texture of the first with the df3-interior. Anyway, 
Alains remedies shuld help.

Best regards
Michael

Post a reply to this message