copying nature is too difficult, however making a parallel worlds using size, scale and colour distributions of nature is easy, and makes fascinating synthetic worlds to explore. i.e. rather than make an actual insect in a computer, it's better to count how many mathematical patterns exist on the insect (eyes, wings, segments, hairs) the pattern sizes and how much of the insect they cover, and generate objects with the same number of patterns, in any order.
Anyways, I want to make a world texture generator for some games, what I am missing is a fractal generator adapted for textures, in shader programming. I would love something like the patterns showing in the picture, which are LastArc Lake-functions on a Julia set? except the code necessitates high zoom, high iteration and double precision numbers, and I would like similar code which is very fast and good at single precision computation of the graphics card. Any suggestions?
all suggestions and web referrals would be very welcome!
current simple CG shader code: half4 frag (v2f i) : COLOR
{
float2 p = i.uv;
float time= _Time*4;
float speed = 0.25;
float3 color = float3(1.0f,0.5f,0.25f);
float2 loc = float2(
cos(time/4.0f*speed)/1.9f-cos(time/2.0f*speed)/3.8f,
sin(time/4.0f*speed)/1.9f-sin(time/2.0f*speed)/3.8f
);
float depth;
for(int i = 0; i < 40; i+=1){
p = float2( p.x* p.x-p.y * p.y,
2.0f * p.x * p.y) + loc;
depth = float(i);
if((p.x*p.x+p.y*p.y) >= 4.0) break;
}
}
(i wish to mix in many similar textures as highlights of background scenes)
February 08, 2010, 02:39:09 AM
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