Great Looking Caustics in Redshift (Redshift Tutorial)

[@smyrkphace]

Ok, if like me you spent 30 minutes wondering why caustics werent comig through check on bucket rendering in the preview window.

[@jaygemini87]

ahahahahah, omg me too

[@_UpVector_]

I'm learning it on Katana and man I was going nuts! There is almost no material on the subject and obviously the settings are all scrambled around. Took me a day to figure this out and I thought it was a bug - now I know it's not. Cheers!

[@smyrkphace]

@@_UpVector_ Learning this stuff is a never ending series of little gotchas like this. Even when youve done it a hundred times, youll come back later and make the same mistakes. lol.

[@Terry_Williams]

I always come back to this video whenever I'm doing caustics because I always forget to right settings to put, thanks again.

[@DannyLrsn]

Great walkthrough, Zak! Very happy to see how to best optimize caustics and how to be able to art direct them better.

[@igobyzak]

Thanks so much!

[@JonathanWinbush]

Great stuff I love seeing C4D Redshift tutorials like this keep it up!

[@igobyzak]

Ah! Thanks, WINBUSH!

[@bulba1561]

Thank you for sharing such valuable knowledge. Definitely one of those channels where you can tell it’s by the heart

[@igobyzak]

Thanks so much for watching and for the kind words!!

[@SPu1se]

superb, bro! Wish you make more of such tutorials.

[@igobyzak]

Thanks so much!

[@robmorissette7586]

Oh man, another banger. Thanks again for this detailed walkthrough.

[@jerostephan]

Honestly, wow. I love you. Well, at least every tutorial you are doing, thank you so much!

[@dominicsagona1186]

Thanks!!! Easy to digest and I don't even have to 'test/explore' myself. Will be ready to go next time!

[@theodoredaley2229]

Really love how thorough you were with the methodology. Only thing would be maybe to linger a bit more on the settings you dial in but otherwise super duper clear! In terms of next tutorials, maybe go through settings for a realistic skin shader next? Or if too much, then perhaps lighting an interior scene (akin to a arch viz scene), it seems like you really are detail oriented (which is a great thing!). Also perhaps Render setting optimization when doing animations?

[@zxcvbs]

Great video, i was fighting with lighting conditions and caustics. I also add an optix denoiser to remove some noise.

[@marcelschaufelberger9637]

really nice tutorial. very detailed and comprehensive. understandable explanations which are easy to follow. that's how it should be for a good learning effect. please do more of them. subsurface scattering would be nice, or controlling reflections with images seems a deep topic. thanks!

[@igobyzak]

Thanks, Marcel! Will definitely keep those suggestions in mind.

[@christian_spies]

Very insightful tutorial! Thanks Zak

[@vincentschwenk]

nice work around, thanks

[@dandin8321]

Fantastic!

[@zeettaaz]

Great tutorial. Thanks!!!

[@Cinema4DTutorialsSV]

Good explanation! Thanks!

[@igobyzak]

Thanks!

[@MotionDesignersCommunityTV]

Thanks!!

[@qmarskalami3323]

Thanks Zak it was really helpful

[@kadarrgo]

Really good stuff here. Thanks much. :)

[@igobyzak]

Thanks, kadarrgo!

[@arthurvalerevich8699]

Soooo good & useful. Thx!

[@루삼]

awesome

[@mike-synthetica]

Hey thanks, this was super helpful!

[@adam44200]

that was really helpful thanks alot

[@petesvids]

this is great, thanks for sharing :-)

[@igobyzak]

Thanks!

[@ELECTR0HERMIT]

BUCKET RENDER must be used to preview caustics in the redshift preview window live.

[@joemorgan1990gd]

Thanks for the tut Zak! Having a lot of difficulty reducing the noise on the caustics even after following each step. Any ideas?

[@igobyzak]

Just make sure your spotlights for caustics are narrow and only hitting the objects that cast caustics. Split your scene up into multiple caustics spotlights if necessary. Only the photon number in the lights affect noise level of caustics so crank those up. 10,000,000+ photons is not unheard of for clean renders. You can "blur" your caustics results with the "Search Radius" in the settings, but I've found this produces more of a muddled look rather than a "clean" look.

[@onedayornever]

Thanks a lot bro

[@irinashamarina987]

Thanks a lot for the tutorial! I don't know if I'm the only one to have this problem, but doing the exact same thing doesn't help to produce any caustics. Already checked settings, tags etc. Can it depend on my GPU? Or anything else?

[@igobyzak]

Double check your RS object tag visibility has caustics enabled, your light is casting caustics photons, and you're using bucket rendering not just ipr progressive mode. Should work!

[@irinashamarina987]

@@igobyzak Thank you for your response! I checked everything, turned on the bucket rendering as well. Everything should be fine, so it seems more like a bug. Hope it will work one day haha

[@igobyzak]

@@irinashamarina987 The only other thing I can think is to make sure your light is bright enough. Try cranking up the intensity of your caustics light and see if anything shows up. Also, if you haven't already, add a Caustics AOV pass and check to see if anything is showing up there. Good luck!

[@emmanuelodoom4737]

Yea I know it’s a year later. But I’m having the same issue.

[@duncanworrall9820]

Hey Zak great tutorial - any idea how to turn off the spotlights "affect diffuse" & "affect specular" in RS3.06 (32mins in) so im just generating Photons - The ray tab has disappeared!

[@igobyzak]

Hey thanks so much! Yeah, there are sliders now under the Details tab of the light where you can reduce diffuse, refections, transmission, etc to 0 for caustic photon emission only.

[@duncanworrall9820]

​@@igobyzak Ah great found it - thanks

[@rayan]

Just curious, how would you apply AOVs in the IPR or render view? I use maya but I figure it should be similar to C4D.

[@BKMuziac]

under redshift AOV manager

[@yoyoz333]

im getting a bi build up of blow out light at the base of my model. how do you avoid that?

[@nicolasmounier9520]

Hey Zak, thanks a lot for this great tutorial! It seems nothing is happening for me when I emit caustic photons from the light + from the material. Could you send me the scene at the beggining so I can check if I did something wrong? Thanks!

[@smyrkphace]

switch on bucket mode, I spent a good 30 minutes scratching my head too.

[@dumadumskaya]

Thanx!

[@jluisroga]

Nerdss? Squeeeeze me???????????? hahaha In al seriousness great tuts, man. Thanks!

[@shahrilsuhaimi5109]

awesome tutorial...hope can share files project too~

[@xpez9694]

what video cards are you using? I am curious. These caustics are rendering pretty quick.

[@igobyzak]

I've sped up the video during the renders, so it's quicker than it seems. But I do talk about some of the render times. I believe most of the caustics calculations happen on the processor side, not the graphics card. Make sure you're using the latest version of Redshift...there was an pretty big speed improvement made a while back that dramatically increased photon processing times.

[@adamfilip]

how do you get light to split into colours like a prism?

[@igobyzak]

That's Dispersion. A setting of 0 is invalid so the effect is off. A low value gives extreme rainbows while a high value gives a subtle prism effect.

[@adamfilip]

trying to achieve water caustics. like in a murky lake.

[@ttmmaacc]

Hey nerds