"Warp" <war### [at] tagpovrayorg> wrote in message 
news:4595019d@news.povray.org...
> Mark Birch <las### [at] hotmailcom> wrote:
>> 1. Coincident surfaces - if you stack one box *exactly* next to the other
>> then Povray won't know which surface to render.  Sometimes it will render
>> 'Box A' and sometimes it will render 'Box B'.  This isn't a problem if 
>> the
>> textures on 'Box A' & 'Box B' are exactly the same, but if they are
>> different you will get random per-pixel speckling where the surfaces
>> overlap.  Simple solution is to leave a very small gap between the two
>> objects.
>
>  This might actually not be the case with axis-oriented boxes because
> the math involved is very straightforward and predictable.
>  It's still safer to leave the gap, though.

If all you want is a stack of images you could use a stack of plane{} 
instead of box{}... they would be quicker to render (ie less surfaces) and 
you'd only have one face per pane to worry about when it comes to 
image_map{} them.

You'll have fun getting all the alpha channel or transparency working right 
though!

And as someone else said, you'll have to up the max_trace_level...

Rarius

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