I just had a brainwave!

I changed fn(x, y, z) to log(fn(x, y, z)), and changed the max_gradient 
to 4. I'm now getting several thousand pixels/second.

Of course - the logarithm function makes the crazy vertical sides less 
"vertical", while not flattening out the parts near the solutions so 
POV-Ray still has some contours to go on.

(I read somewhere that dividing your function by a big number makes 
max_gradient lower, but doesn't make it trace any faster. But this trick 
makes the big numbers small, but leaves the small numbers alone so 
POV-Ray doesn't go around taking tiny steps there any more.)

Post a reply to this message