Chaos Corona for 3ds Max > [Max] Daily Builds

Faster caustics + volumetric caustics playground!

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maru:
The newest daily build of Corona features new improved caustics. They can be used inside volumes, be it global volume, Corona Volume Grids, Phoenix simulations, smoke, fog, murky water - you name it! They also generally render faster both on surfaces and in volumes. You can also control the intensity of surface caustics and volume caustics independently (in Render Setup > Performance).

Please note that this feature is still a work in progress, so treat the following examples as pre-production samples. We are working on further improvements!


Quick how to:
- Set up your objects with volumetric materials
- Cast some caustics onto them (directly with a Corona light, through a refractive object, reflected off a metallic surface,...)
- Make sure you have the Caustics Solver enabled in Render Setup > Performance
- Render!

Comparison 1 - https://corona-renderer.com/comparer/rrnDiG

Comparison 2 - https://corona-renderer.com/comparer/TEvjq2

CharlyRT:
Finally, a Caustic Multiplier!!!!!!
I have been asking for this for years!!!!
Glad that its finally here

marchik:
I'm happy as a clam, I've been waiting for this for several years. The only thing is that since the caustics in volumetrics need the volumetrics itself, it has now become treacherously noticeable how slowly volumetrics renders with the Inside Volume mode. Now this is a desired improvement. (and of course the ability to render caustics by region)

As for the caustics itself, everything works nice, I haven't encountered a single bug yet (once, however, it simply disappeared until I moved the camera a little). It has become much faster and cleaner, thanks to the devs!

maru:

--- Quote from: marchik on 2024-10-18, 01:07:22 ---it has now become treacherously noticeable how slowly volumetrics renders with the Inside Volume mode.

--- End quote ---
You used this mode in the "sphere" example, right? I can only recommend increasing the step size as much as possible and enabling "single bounce only". 


--- Quote ---(and of course the ability to render caustics by region)

--- End quote ---
This should now work better than before. If you render a region, this should not result in glitches/splotches, but under the hood caustics are calculated for the whole image, so there won't be as much speed up as expected.

Throwing one more. :)

marchik:

--- Quote from: maru on 2024-10-18, 09:13:12 ---
--- Quote from: marchik on 2024-10-18, 01:07:22 ---it has now become treacherously noticeable how slowly volumetrics renders with the Inside Volume mode.

--- End quote ---
You used this mode in the "sphere" example, right? I can only recommend increasing the step size as much as possible and enabling "single bounce only". 


--- Quote ---(and of course the ability to render caustics by region)

--- End quote ---
This should now work better than before. If you render a region, this should not result in glitches/splotches, but under the hood caustics are calculated for the whole image, so there won't be as much speed up as expected.

Throwing one more. :)

--- End quote ---

Yes, where the smoke above the surface is not uniform, which is usually the case in scenes closer to production. I even had to do this pic with a step size of 25 cm and render it in a very low resolution, I'm afraid to imagine what will happen in a real exterior scene, for example, like yours with the pool.

I recently had scenes with a hot jacuzzi, where I would like to get caustics from a light source at its bottom, passing through a layer of bubbling water and steam above it. Naturally, this will be the noisiest place in the whole scene and I would definitely use a render region after the rest of the scene is ready. But, according to my tests, rendering with a region still creates splotches for now, which then do not disappear later.

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