Caustics Dream

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Caustics Dream

Postby joenyc » Tue Aug 04, 2020 2:10 am

joenyc Tue Aug 04, 2020 2:10 am
I know new caustics capabilities are on the roadmap, but I want to pop on and say I'd LOVE to see whatever voodoo LuxCoreRender is using implemented into Octane. Their caustics converge almost instantly without fiddling with a bunch of different settings or battling fireflies:

CausticsComparison.png


Gorgeous! Caustics have for too long been the missing link in cg photorealism (they're everywhere!), I look forward to taking them for granted in the future.
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Re: Caustics Dream

Postby promity » Tue Aug 04, 2020 2:33 am

promity Tue Aug 04, 2020 2:33 am
I completely agree.
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Re: Caustics Dream

Postby whersmy » Tue Aug 04, 2020 11:49 am

whersmy Tue Aug 04, 2020 11:49 am
Wow!
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Re: Caustics Dream

Postby james_conkle » Tue Aug 04, 2020 1:02 pm

james_conkle Tue Aug 04, 2020 1:02 pm
Is that 5 hour render time with path tracing kernel? I would imagine for a scene like this PMC would actually speed things up. Not to the LuxCore 1 min mark but 5 hours is crazy.
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Re: Caustics Dream

Postby joenyc » Wed Aug 05, 2020 2:19 am

joenyc Wed Aug 05, 2020 2:19 am
james_conkle wrote:Is that 5 hour render time with path tracing kernel? I would imagine for a scene like this PMC would actually speed things up. Not to the LuxCore 1 min mark but 5 hours is crazy.


Yes, unfortunately. I’ve been experimenting with PCM settings and have exhausted all the tutorial info I can find online about Octane caustics, but I can’t get caustics to resolve adequately unless I crank up the caustic blur which destroys all the interesting caustic detail.

Happy for any tips if you’ve got em!
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Re: Caustics Dream

Postby bepeg4d » Wed Aug 05, 2020 8:39 am

bepeg4d Wed Aug 05, 2020 8:39 am
Hi
PMC is not fast, and the time obviously depends on the OctaneBench power of your system (mine is ~600), but 5h seems definitely too high :roll:
Please, try with the following PMC settings, the most important for caustics, is the Parallel Samples, that must be set to 1:
1BA29478-9E4C-446E-A5DC-02606B8399B6.jpeg


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Re: Caustics Dream

Postby joenyc » Thu Aug 13, 2020 1:12 am

joenyc Thu Aug 13, 2020 1:12 am
bepeg4d wrote:Hi
PMC is not fast, and the time obviously depends on the OctaneBench power of your system (mine is ~600), but 5h seems definitely too high :roll:
Please, try with the following PMC settings, the most important for caustics, is the Parallel Samples, that must be set to 1:
1BA29478-9E4C-446E-A5DC-02606B8399B6.jpeg

ciao Beppe


Interesting, I'll give it a try. FYI - The Octane manual for Houdini and the YouTube tutorial videos that Otoy has published only mention that raising Parallel Samples can help render speed. There is no connection made to caustic rendering (even in the video about the PMC kernel and caustics). It might help others to have that info published.
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Re: Caustics Dream

Postby joenyc » Thu Aug 13, 2020 1:10 pm

joenyc Thu Aug 13, 2020 1:10 pm
bepeg4d wrote:Hi
PMC is not fast, and the time obviously depends on the OctaneBench power of your system (mine is ~600), but 5h seems definitely too high :roll:
Please, try with the following PMC settings, the most important for caustics, is the Parallel Samples, that must be set to 1:
The attachment 1BA29478-9E4C-446E-A5DC-02606B8399B6.jpeg is no longer available


ciao Beppe


No luck with those settings, sadly. Still the same result in almost 6 hours.
Screen Shot 2020-08-13 at 9.05.59 AM.png
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Re: Caustics Dream

Postby bepeg4d » Fri Aug 14, 2020 7:12 am

bepeg4d Fri Aug 14, 2020 7:12 am
Hi,
do you mind to share the scene with me via Private Message?

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