I've been trying to develop a texture which resembles old 
paper/parchment.  I've not yet got the effect I want - I can get a 
texture that looks fine from a distance, but cannot get something which 
has that fibrous look close-up.  I'm also having trouble matching the 
tan/brown colour of old paper (maybe I need a color_map?).  The only 
other "catch" is that I need something which'll render relatively fast, 
as I'm going to be using this in a fairly long animation - i.e. I'm 
trying to avoid functions and isosurfaces.

Here's what I've got so far - the pigment is white; just to highlight 
the texture.  As you can see, I've got a long ways to go:

#declare T_Paper = texture {
   pigment { color rgb <1,1,1> }
   normal { wrinkles 1 scale 0.01 }
   finish { diffuse .7 roughness .0085 ambient 0.2 }
   }//end paper texture

Any ideas?

Bryan

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