web.4638100b40b8ee6c7a9334df0@news.povray.org...
>I am looking for help on an effect (or maybe it's two effects)
>
> 1. I want to create a 3D image which looks like transparencies stacked one
> on top of the other. Each transparencey will have an image or text on it
> (via image_map I think).   I can use Box{} to simulate the sheet with
> dimensions of the sheet and z dimension being thickness (i.e. a very thin
> box).  If I put several on top of each other will I need to increase the
> maxtrace value?

If you use boxes, the rays will cross 2 surfaces per box. Why not use planes 
or pairs of triangles (if you want edges) which have no thickness at all 
beeing single face objects? You certainly will need to increase 
max_trace_level which default value is5.

>
> 2. Is it possible to determine where on the Box{} the image is placed?
>
You can apply transformations to you pigment.
Here is an exemple of texture :

   texture
   {
      pigment
      {
         image_map
         {
            jpeg   "You_image.jpg"
            once // image displayed only once, no tiling!
            filter all 1.0 // filter transparency  as coloured filter , you 
can use transmit as well (or any mixed amount of both) as a thin fabric 
behaves with light
         }
         translate    <-0.2, -0.5, 0.0>  // here a translation but you can 
scale and rotate as usual
      }
      finish
      {
         ambient 0.0
         diffuse 0.8 // diffuse value higher than 0.6 default value to keep 
a contrasted image
      }
   }


Marc

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