Caustics playground!

[maru]

I spent some time today testing Corona 4 release candidate. I must say I'm in love with this release, can't wait when it's officially available.
Attached the image taken from under the pool of water, testing caustics and learning Grow Fx.
Are volumetrics not supported while using caustics yet? Out of curiosity I rendered version without caustics enabled and volumetric pass looks completely different.
Anyways, I'm amazed how quickly corona handled those!

The new caustics solver does not work with volumetric media yet. Caustics in volumes will be resolved using the classic path tracing, which will be a loooot slower and probably almost non-visible.

By the way, is the camera placed underwater here? If so, the IOR should be different - you should create a Corona material with refraction level 1 and refraction IOR of 1,33 and use it as the global volume material. :)

[Ink Visual]

The new caustics solver does not work with volumetric media yet. Caustics in volumes will be resolved using the classic path tracing, which will be a loooot slower and probably almost non-visible.

By the way, is the camera placed underwater here? If so, the IOR should be different - you should create a Corona material with refraction level 1 and refraction IOR of 1,33 and use it as the global volume material. :)

Thanks Maru!
And no camera is not under water, idea behind this was just to have a thin water surface on top of the glass to achieve nice caustics penetrating the well.
But what you proposed sounds cool, I will use your tip and do the underwater version later today ;)

[Javadevil]

I'm playing with Caustics and finding lots of fireflys that do not want to go away.
Heres a test with a Hdri map with the enable caustics environment from the render settings

[Feodor]

Found another limitation in caustic, it does not work on hair and fur.

[maru]

I'm playing with Caustics and finding lots of fireflys that do not want to go away.
Heres a test with a Hdri map with the enable caustics environment from the render settings

Could you share this scene with us? That would really help us understand the issue.

Found another limitation in caustic, it does not work on hair and fur.

We will definitely look into this!

[Javadevil]

I'm playing with Caustics and finding lots of fireflys that do not want to go away.
Heres a test with a Hdri map with the enable caustics environment from the render settings

Could you share this scene with us? That would really help us understand the issue.

Do you still need it? If so I'll cut down the scene, should I PM you a link?

[maru]

I'm playing with Caustics and finding lots of fireflys that do not want to go away.
Heres a test with a Hdri map with the enable caustics environment from the render settings

Could you share this scene with us? That would really help us understand the issue.

Do you still need it? If so I'll cut down the scene, should I PM you a link?

Yes, that would be great. We are always interested in user scenes. You can use this private uploader and then let me know which upload method you used and what was the file name: https://corona-renderer.com/upload

[Javadevil]

I'm playing with Caustics and finding lots of fireflys that do not want to go away.
Heres a test with a Hdri map with the enable caustics environment from the render settings

Could you share this scene with us? That would really help us understand the issue.

Hi Maru,
Scene uploaded and PM sent, File was to big for the Corona Uploader so I used onedrive.

cheers

Do you still need it? If so I'll cut down the scene, should I PM you a link?

Yes, that would be great. We are always interested in user scenes. You can use this private uploader and then let me know which upload method you used and what was the file name: https://corona-renderer.com/upload

[maru]

( internal note: Javadevil persistent splotches: id=370421839 )

[maru]

I'm playing with Caustics and finding lots of fireflys that do not want to go away.
Heres a test with a Hdri map with the enable caustics environment from the render settings

The latest daily (27.08.2019) shows huge improvement in this scene. You can get it here: https://coronarenderer.freshdesk.com/support/solutions/articles/5000570015
Please let us know if you can confirm our findings.

[annkos]

Hi guys a just for fun test with caustics..the animation quality is a bit crap fo now

link

[marchik]

Literally in every second scene, caustics cant become clean and remains noisy regardless of the number of passes.
Is it possible to denoise the Cshading_Caustics element with Nvidia denoiser separately and use Corona HQ denoising for other passes? im pretty tired from using photoshop smudge tool every time)

[zelyonyi]

here is a quick test.

[Nejc Kilar]

Literally in every second scene, caustics cant become clean and remains noisy regardless of the number of passes.
Is it possible to denoise the Cshading_Caustics element with Nvidia denoiser separately and use Corona HQ denoising for other passes? im pretty tired from using photoshop smudge tool every time)

Observing the same thing here. Every other scene basically is too tough for the caustic solver to resolve. I'm talking 400+ passes to at least get something usable. :\

[TomG]

Be sure to send in such scenes where at all possible :)