Frosted Glass Challenge (Any Render Engine)

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  11 November 2013
Originally Posted by uglykids: The Investigation part was aimed at KeyCZ for posting a meaningless image from Maxwell.

Challenge on what? The initial challenge was if the frosted dragon can be done properly. Maxwell could and can solve the recent issues as well.

A new challenge should go deeper to rule out all biased approaches imo.

Sorry if I came off snippy. Thought you were talking to me. Cheers.
  11 November 2013
Originally Posted by uglykids: A proper rendering was shown in the maxwell forum, showing the caustics after 1 hour at SL21.

Least to say its rather pathetic to draw this faulty comparison, I'd suggest to investigate before claiming and assuming wrong cases.

Maxwell could do these caustics well before 2012.

1) read my disclaimer
2) watch your tone and stay polite, please
3) By "reliably render" I've meant "in most scenes with good quality and acceptable render time". 1 hour for a cornell box is not an acceptable time. Of course it is possible to render such caustics with all unbiased algorithms (excluding them requires extra effort - they are "turned on" by default just by implementing the algorithm correctly). It just takes different amount of time for each one of them. The point is, pre-2012 algorithms (bidir, pt, metropolis implementations without manifold exploration) cannot render scenes with SDS paths reliably - PT won't clean up any caustics, BDPT won't clean up any reflected caustics, PPM won't clean up diffuse parts of the scene, and different metropolis flavors will just randomly succeed or fail depending on a scene and its settings. You can try grabbing the VCM and manifold papers and rendering them with Maxwell. I can guarantee you it will fail horribly in at least one scene, if you don't use either of the two algorithms.
  11 November 2013
So what was it you wanted to prove here then, if not : maxwell cannot do it properly?
  11 November 2013
Originally Posted by uglykids: So what was it you wanted to prove here then, if not : maxwell cannot do it properly?

That there are different types of caustics, some can be rendered with simple path tracing, some need bidirectional path tracing/metropolis, and some are even more complicated and could not be rendered in reasonable time and quality by any render engine, not just maxwell, before VCM and manifold exploration was introduced in late 2012.
  05 May 2014
I find this challenge pointless. As it does not have a real-world item to compare. Viewing each image on its own is highly subjective. Nearly every one, when viewed alone, could be the best. We are all looking at what we think frosted glass looks like. Classic artist blunder when building shaders and textures. ALWAYS have the real thing to compare to.

What needs to happen is we need to get a frosted glass trinket, shoot it in a proper studio photo-box then run the challenge.

Real-world reference and comparison.
Kevin "Q" Quattro
VFX CG Supervisor "Star Trek"
CBS Television Productions, In-House

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