bmc wrote:
> "Steely" <nomail@nomail> wrote:
> 
>>In our german POV forum a guy came up with this question and no one of us
>>was able  to solve it. So I decided to forward it.
>>// -----------------
>>
>>The task is to make a big stone wall made by boxes, half a unit high and a
>>unit wide. The single stones shall have a marble texture that way, that
>>every stone is slight different from the others. But instead of building
>>the wall out of 500 single stones, he wants *one* box with a brick pattern
>>*and* every brick shall have a different look.
>>// -----------------
>>
>>Any Ideas ?
>>
>>TIA
>>
>>Steely
> 
> 
> 
> i had a similar problem a few weeks ago. this is what i came up with:
> 
> #declare brick_length = 2;
> #declare brick_d = .1;  // thickness of the motar
> // position "inside" the stone
> #declare fn_brick_u = function(u,v) { u - floor(v)*brick_length/2 - floor((u
> - floor(v)*brick_length/2)/brick_length)*brick_length }
> #declare fn_brick_v = function(u,v) { v - floor(v) }
> // middle point of the stone
> #declare fn_brick_n_u = function(u,v) { floor((u -
> floor(v)*brick_length/2)/brick_length)*brick_length }
> #declare fn_brick_n_v = function(u,v) { floor(v) }
> // mask for motar
> #declare fn_mortar = function(u,v) {
>   max (
>     select(u-brick_d,1,select(brick_length-brick_d-u,1,0)),
>     select(v-brick_d,1,select(1-brick_d-v,1,0))
>   )
> }
> 
> ....together with a pattern for the stones...
> 
> #declare fn_pig = function {
>   pattern {
>     marble
>     warp { turbulence 1 }
>   }
> }
> 
> .... gives a nice stone wall pigment:
> 
> pigment {
>   function { fn_mortar(fn_brick_u(x,y),fn_brick_v(x,y)) }
>   pigment_map {
>     [ 0.0 //the stones
>       function { fn_pig(
>                    fn_brick_u(x,y)+fn_brick_n_u(x,y)*100,
>                    fn_brick_v(x,y)+fn_brick_n_v(x,y)*100,z) }
>       color_map {
>         [0.0 color rgb 0.0 ]
>         [1.0 color rgb 1.0 ]
>       }
>     ]
>     [ 1.0 // the mortar
>       color Red
>     ]
>   }
>   scale .5
> }
> 
> hope that helps!
> 
> thilo mack
> 
> 
But the whole point is to randomly apply a large variety of different 
textures to different bricks without producing discreet brick objects. 
Are you not just applying the same stone texture across a brick texture?

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