Hi all.
I have 2 separate questions regarding 'scale' and what it means.
1) The scale factor : I have heard people talk about 'scale' as of 'a scale xyz power w mandelbulb' etc... I don't know what it is and how to implement it. For example, here is my mandelbulb glsl code :
float DE (vec3 pos) {
vec3 z = pos;
float wr = length(pos);
float dr = 1.0;
float escape = FEscape;
float Power = FPower;
float Scale = 1.0;
for (int i = 0; i != FMaxIterations && wr < FEscape; i++) {
float wo = acos(pos.y / wr);
float wi = atan(pos.x, pos.z);
dr = pow(wr, Power - 1) * Power * dr + 1;
wr = pow(wr, Power);
wo = wo * Power;
wi = wi * Power;
pos.x = sin(wo) * sin(wi);
pos.y = cos(wo);
pos.z = sin(wo) * cos(wi);
pos = pos * wr;
pos = pos + z;
wr = length(pos) * Scale;
}
return min(2.0, 0.5 * log(wr) * wr / dr);
}This code works as it should. How would I 'insert' a scale variable into the formula ?
2) General size of a fractal : the code above gives me a bulb roughly contained in a radius 2 sphere (I guess). How would I have it contained in a radius 2'000'000 sphere (for example)
The idea is : glsl float precision is so bad that I can barely go under the 10
-6 barrier. with a 10
6 scaled bulb, I would have twice as much precision to play with.
Maybe a similar question has been asked already I dunno
thx for any insight
November 11, 2006, 03:49:14 AM
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