On 04/01/12 02:45, Christian Froeschlin wrote:
> Very neat!

   Thanks!

> Tried some simple procedural base textures (gradient + spiral2).

   Yeah... crackle is also a good base.

> I'm still not quite sure what properties a good base texture should
> have, some are quite impossible to line up (your *_03 sample also has
> some odd edges).

   Well, already repeating patterns are the best, of course. Also, you
can get ride of the random rotation, and use instead a fixed amount, to
line up the image patterns with the tiling pattern: it should give you
more chances to get a result without obvious seams.

   Another way I've just found, is to apply successive repeat warps
combined with 120 degree rotations, "a la stbenge":

#declare t_base=
texture{
     pigment{
       image_map{jpeg imagemap interpolate 2}
       rotate 90*x
       translate rand(r_pattern)*x
       translate rand(r_pattern)*z
       rotate 360*rand(r_pattern)*y
       scale im_scale
       #local nCount = 0;
       #while ( nCount < 360/120 )
         rotate 120*y
         warp { repeat .5*x flip x}
         warp { repeat sqrt(.75)*z flip z}
         #local nCount = nCount + 1;
       #end
     }
     finish{emission 1}
}

   This limits a bit the variety of the results, but you get ride of the
visible seams.

--
Jaime

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