Okay. Good that you think it'll work for you. I thought afterward that I 
should maybe have said something about the "alpha.png" being used for both 
height_field and pigment, along the lines of: it might not do well to use 
the same exact image file because of the HF using a specific color=height 
thing. Probably not always going to work right. And water_level I gave it 
would drop any dark parts- including those that are in your logo/symbol. 
Best thing would be a cutout kind of image so whole thing is just black and 
white, that way you have a reasonably good edge for the graphic your trying 
to create the extrusion for.

Not always easy to convey every detail for a new POV-Ray user. Good to read 
the documentation for what you find in the scripts, in order to get the 
details figured out or move on to the next question.

Oh yeah, and thanks for the offer to see the result but no need to do that. 
Unless you want to post at povray.binaries.images, of course.

Bob Hughes

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