Am 19.04.2018 um 00:53 schrieb Bill Pragnell:
> This is fun! I always meant to make some random bricks, so I've just had a go
> myself. I ended up with almost exactly what you've got (more or less) which is
> good. However, I don't think you need the oversized offset value - just 1.5 in x
> and z is fine.
> 
> I've boiled it down a little. Here's a macro to insert a pigment - I went with
> the same principle of using the brick pattern for the mortar and the cells
> pattern for the bricks themselves.
> 
> (BrickSize is a vector describing the brick dimensions, BaseCol and MortarCol
> are colour vectors, and MortarThickness is just the mortar float value.)
> 
> 
> #macro RandBrick(BrickSize, BaseCol, MortarCol, MortarThickness)
>   #local RBrick = pigment {
>    cells
>    color_map { [0 rgb BaseCol] [1 rgb 0.25*BaseCol] }
>    translate z*0.5
>    warp { repeat y offset <1.5, 0, 1.5> }
>    scale BrickSize
>   }
>   pigment {
>    brick
>    pigment { rgb MortarCol },
>    pigment { RBrick }
>    brick_size BrickSize
>    mortar MortarThickness
>   }
> #end
> 
> 
> 
I never came up with the idea to use the cells pattern this way. But my 
goal was not different textured bricks but rubble work. So i played a 
little bit with the brick pattern (and still need some time to get a 
better approximation). One of the most annoying issues was that I had 
only two textures (mortar and brick). But now you gave me a new 
direction to play a little bit more with something like this:

#declare BrickSize = <8,3,4.5>; // Default, but needed to scale the 
cells pattern
#declare CellsStoneTex = texture {
    cells
    texture_map {
      [ 0.00 T_Grnt20 ]
      [ 0.25 T_Grnt7 ]
      [ 0.50 T_Stone21 ]
      [ 0.75 T_Stone10 ]
      [ 1.00 T_Grnt28 ]
    }
    translate z*0.5
    //warp { repeat y offset <1.5,0,1.5> }
    scale BrickSize
}
texture {
    brick
    texture { T_Grnt1 finish { phong 0.5 } }, // Mortar
    texture { CellsStoneTex }
    brick_size BrickSize

    mortar 0.2
    scale 0.1

    warp { turbulence 0.4 octaves 8 lambda 3 omega 0.5 }

}

Many thanks to both of you!

Best regards
Michael

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