"Smws" <smw### [at] poboxcom> wrote:
> "Joanne Simpson" <cor### [at] onewhiteravencom> wrote:
> > guess what's absent (OK it's a bit obvious)
> > Joanne
> > http://www.onewhiteraven.com
>
> Wow, I like the light on the rocks vs. the background, and the rocks
> themselves are very interesting.

both v. simple.
The lighting & background come from Jaime Vives Piquere's Lightsys macros
(http://www.ignorancia.org/en/index.php?page=Lightsys) plus a single
shadowless point light inside the umbrella.
The rocks are just isosurfaces:
 #declare F_bank=function{pigment{
   granite
   turbulence 0.5
   color_map { [0 rgb 1] [1 rgb 0] }
   scale <3,2,3>
   //rotate z*-20
   }
 }

 #declare left_cliff =
 isosurface{
  function{max((y*y-1),(x*x-1),(z*z-1))+F_bank(x,y,z).grey*0.3
                                                     } // a simple plane
 max_gradient 10// the default value
 contained_by{box{<-1,-1,-1>, <1,1,1>}}
   texture {  T_Terrain}
 scale <2,6,1>
 translate x*-3
                 }

 #declare right_cliff =
 isosurface{
  function{max((y*y-1),(x*x-1),(z*z-1)) +F_bank(x,y,z).grey*0.2
                                                     } // a simple plane
 max_gradient 10// the default value
 contained_by{box{<-1,-1,-1>, <1,1,1>}}
   texture {  T_Terrain}
 scale <2,6,1>
 translate x*3
                 }

object {left_cliff}
object {right_cliff}

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