Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: RenoJ on 2019-06-10, 20:47:08

Title: New Caustics - Fireflies
Post by: RenoJ on 2019-06-10, 20:47:08

Hi,

I'm trying to get the new caustics working on a current project swimming pool scene but I just get tons of fire flies.

The water is a solid object with a large noise displacement map, IOR 1.33 for both. The water object is bigger than the container would that be an issue? If so how would I manage that with displacement also being on?

The example on the blog looks amazing with the caustics in the pool and wall but cant seem to get anything like that.

I did try a new test scene with just a glass, plane and light but still cant seem to get it.

- Material Editor - Caustics (slow) - on
- Render setup - Caustics solver - enabled

I was wondering if the swimming pool scene was available somewhere on the site so I can see where I've gone wrong?

Thank you in advance

Title: Re: New Caustics - Fireflies
Post by: Giona on 2019-06-11, 10:18:50

For how long did you let the image render? Some fireflies that appear at the start of the rendering may disappear after few minutes.

Can you post a screenshot of the problem?

Title: Re: New Caustics - Fireflies
Post by: maru on 2019-06-11, 16:04:39

An example image showing the issue would be very appreciated. Otherwise we don't really know what exactly we are talking about here.

Title: Re: New Caustics - Fireflies
Post by: RenoJ on 2019-06-12, 19:54:57

Hi,

I cant upload the scene I was having trouble with as it's a live project but through trial and error I realised the sun angle didn't lend itself to the caustics I was looking for + not waiting long enough.

Title: Re: New Caustics - Fireflies
Post by: Rimas on 2019-06-17, 17:48:22

Honestly, I've tried it with a water plane, then solid geometry and... I'm just seeing a bunch of fireflies that don't converge into what should look like caustics. Not sure what I'm doing wrong. Maybe my random test HDRi doesn't suit the need.

Title: Re: New Caustics - Fireflies
Post by: TomG on 2019-06-17, 17:59:48

HDRIs are not a great way to get caustics - far better to have them come from a light source (e.g. a Corona sun). Maybe try that and see if it makes a difference? (You can disable caustics from the environment, usually those are going to be much harder to calculate than caustics from a light source).

Title: Re: New Caustics - Fireflies
Post by: maru on 2019-06-18, 14:24:58

We will soon release a new build with improved caustics. Please re-test your scenes once it's out.