Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: cecofuli on 2013-09-27, 15:08:09

Title: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: cecofuli on 2013-09-27, 15:08:09
Hello,
unfortunately, with Corona is impossible to render, correctly, liquid inside containers. Look at the images.
Also, with VRay I can achieve better (correctly) result in less time (VRay-RT GPU Nvidia 560GTX)
In Corona, water is dark.

(*) In my render I used a solid box for the water (PT+HD)
(*) The refraction color is perfect white


(http://www.francescolegrenzi.com/Temp/Corona/0023_Corona_vs_VRay.png)
Title: Re: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: maru on 2013-09-27, 15:13:40
Old problem. For this you should use Bidir/VCM with solid refraction mode or set MSI to some high value or 0 and wait wait wait until it refines.
Title: Re: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: Ondra on 2013-09-27, 15:15:15
until you use specular light sources, you can get away with this by increasing MSI ;)
Title: Re: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: cecofuli on 2013-09-27, 15:15:23
I know, it's old problem. Jut I found weird the shadow inside the container when I use Hybrid.
Title: Re: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: cecofuli on 2013-09-27, 15:18:41
until you use specular light sources, you can get away with this by increasing MSI ;)

(*) I tried with 800 and 8000 MSI + progressive mode. I have dark shadows inside the container. It isn't like VRay.
(*) Bidir/VCM is just experimental right now.
Title: Re: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: maru on 2013-09-27, 17:20:36
So I guess hybrid mode doesn't cast direct shadows but blocks GI.
Title: Re: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: Ludvik Koutny on 2013-09-27, 20:17:20
For twosided glass mode, keymaster used shadow model that subtracts some light based on the amount that got reflected by fresnel reflection. And i think he has used the same model for hybrid glass as well. In Vray, checking affect shadows just makes shadow transparent based on the amount of refraction, but does not take reflection into account.
Title: Re: Corona and liquid: OneSide vs TwoSide vs Hybrid
Post by: Ondra on 2013-11-25, 18:15:30
duplicate of a mantis entry