Chaos Corona Forum

Chaos Scatter => [Scatter] I need help! => Topic started by: patrick.testa on 2019-03-20, 15:33:17

Title: [solved] Strange Z depth error with Corona scatter [SOLVED]
Post by: patrick.testa on 2019-03-20, 15:33:17

Hello,
I attach a couple of renders where I have issues with scattered items (corona proxies); I have a scatter with grass and a scatter with bushes and plants. In some points of the images the bushes disappear behind the grass (they look like they have a wrong mask), while their shadow is still visible.
I still have to investigate the problem but maybe someone have a suggestion on what could have happened.
Thank you in advance!

Patrick

Title: Re: Strange Z depth error with Corona scatter
Post by: mferster on 2019-03-20, 17:28:59

Weird. Have you check to see if it still happens when they aren't proxies?

Title: Re: Strange Z depth error with Corona scatter
Post by: patrick.testa on 2019-03-21, 09:39:45

Hello Mferster, I've solved the issue. The problem was in one of the materials of the bushes which had both refraction and transucency. I removed refraction and now it works! Strangely, if I render the same bush by itself and not as a part of a scatter, it works correctly even with the old material; maybe Corona scatter uses some optimization that makes the problem come out...

Title: Re: [solved] Strange Z depth error with Corona scatter [SOLVED]
Post by: maru on 2019-04-04, 15:44:23

Yep, refraction was the first thing I was about to ask. It is both incorrect (as it should be used with solid objects only), and inefficient performance-wise.