[?] sampling acceleration

Feature requests, bug reports and related discussion
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CTZn
Posts: 7240
Joined: Thu Nov 16, 2006 4:34 pm
Location: Paris, France

Here's the baby

Post by CTZn » Thu Apr 05, 2007 12:29 am

Ok, I'll try to go beyond my primal fears... like working on a computer :lol:

My second try to resume an image with Indigo was to test it's ability to take different values from the first render (actually my very first try didn't work at all, I was using the command uncorrectly).

More theory:

It seems logical to make evoluate the noise from very low frequency to high frequency, and max change from a rather high to a very small value, but effectively I had contradictory results. I didn't push the tests further enough to decide wich approach was more efficient.

But the very first step now is to define clearly what <max_change> and <large_mutation_prob> are exactly, and how they behave (linearly or not). Basically, I think that:

<max_change> concerns colors, how drastically they can be different from one sample to the next,

<large_mutation_prob> is the scale of the noise. Low values are low frequency noise AFAIK. Try very low values, you should even see clearly the stochastic path. Another example:

Do someone know exactly what these to guys are after ? Er... Ono maybe ? :D

If a plugin is made to manage these two, it should make them evoluate permanently from a start value to an end value (defined by user if not automatically (after analysys of the best response for start values)). If we have to resume by hand (or script) I think we should use "harmonics" of the start values for successive resuming.

... ok, I think I've said pretty much all I could...

Image
If I remember correctly this is only the first iteration. You can see that large parts of the image are covered, while others were untouched.

Misc tests I did with noise settings (same render time for all images):
Image
ImageThis is a 50% gray plane :D (1mn render maybe)

Got to go, but you see there is a lot to do !

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