Hi
I hope this is the right place to ask.
I'd like to reproduce the fractal from this blog post:
http://blog.hvidtfeldts.net/index.php/2011/08/distance-estimated-3d-fractals-iii-folding-space/comment-page-1/#comment-20302 section "A Real Fractal". The post uses Raymarchiing and a distance function.
The problem is, that my ray misses the fractal. I don't know what sensible values for "Iteration" and "scale" to set and I guess, that may ray construction is also a little bit off...
Here is my code:
Constants:
const float Iterations = 4;
const float Scale = 5.0;
Fractal DE:
float distanceFromPoint(vec3 z) {
vec3 a1 = vec3(1,1,1);
vec3 a2 = vec3(-1,-1,1);
vec3 a3 = vec3(1,-1,-1);
vec3 a4 = vec3(-1,1,-1);
vec3 c;
int n = 0;
float dist, d;
while (n < Iterations) {
c = a1; dist = length(z-a1);
d = length(z-a2); if (d < dist) { c = a2; dist=d; }
d = length(z-a3); if (d < dist) { c = a3; dist=d; }
d = length(z-a4); if (d < dist) { c = a4; dist=d; }
z = Scale*z-c*(Scale-1.0);
n++;
}
return = (length(z) ) * pow(Scale, -float(n));
Construction of rays
vec2 q = gl_FragCoord.xy / u_ws.xy;
q = -1.0 + 2.0 * q;
q.x *= u_aspect;
vec3 planePoint = vec3(q.xy, 0.0);
vec3 ro = vec3(0.0, 0.0, 1.3); //eye-position
vec3 rd = normalize(planePoint - ro);
vec4 debugColor = vec4(vec3(0.1).xyz, 1.0);
vec4 color = vec4(trace(ro, rd));
I hope someone can give me a hint.
December 27, 2013, 08:48:22 PM
Fast fake montecarlo for raymarching - Now with fragmentarium script!
Fragmentarium
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