Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: Vyacheslav Volkov on 2017-04-30, 12:04:13

Title: Fireflys
Post by: Vyacheslav Volkov on 2017-04-30, 12:04:13

I haven't used corona a lot before, i am doing exterior rendering and i am having problems with fireflies can someone explain to me why something like this is happening?

Title: Re: Fireflys
Post by: romullus on 2017-04-30, 12:15:58

Most likely it's from incorrectly setup of leaves and grass materials. Could you show settings of those aforementioned materials?

Title: Re: Fireflys
Post by: Vyacheslav Volkov on 2017-04-30, 12:27:07

I think the material is okay, pretty standard one

Title: Re: Fireflys
Post by: Vyacheslav Volkov on 2017-04-30, 13:42:08

What i found out is that i use hdri in reflection override and because of hdri, i have those weird fireflies, is there a way how to use hdri, without having problems with fireflies?

Title: Re: Fireflys
Post by: PROH on 2017-04-30, 16:42:17

Here's an old tricks that sometimes works: put the HDRI map in an "output" map with "clamp" activated (checked).

Hope it helps

Title: Re: Fireflys
Post by: Juraj on 2017-04-30, 17:09:50

Quote from: PROH on 2017-04-30, 16:42:17

Here's an old tricks that sometimes works: put the HDRI map in an "output" map with "clamp" activated (checked).

Hope it helps

At which point it isn't HDRi anymore ?

Title: Re: Fireflys
Post by: PROH on 2017-04-30, 18:12:08

Well in the reflections override slot it shouldn't be a problem, or..... ?

Title: Re: Fireflys
Post by: romullus on 2017-04-30, 19:25:18

Quote from: neskafee on 2017-04-30, 12:27:07

I think the material is okay, pretty standard one

I'd set refraction to 0, just in case your refr colour isn't completely black and 0,5 translucency is too much for greenery - 0,2-0,25 should be better. Other than that, yes pretty normal material.

Quote from: neskafee on 2017-04-30, 13:42:08

What i found out is that i use hdri in reflection override and because of hdri, i have those weird fireflies, is there a way how to use hdri, without having problems with fireflies?

Do you really need reflection override in a scene like that? Normally refl override shouldn't cause problems, but it is slightly buggy at the moment, so you'd better avoid using it if you can.

Quote from: PROH on 2017-04-30, 18:12:08

Well in the reflections override slot it shouldn't be a problem, or..... ?

It shouldn't... if you like flat unrealistic reflections that is.

Title: Re: Fireflys
Post by: PROH on 2017-04-30, 19:59:02

:)

Title: Re: Fireflys
Post by: Rhodesy on 2017-05-31, 15:23:18

Damn it im just trying this for having a HDRI show in a buildings windows whilst using the corona sun/sky for the lighting. Looks great apart from the fireflies. Hoping there is a fix in the core for this as it looks better than adding the reflections in post even if its a bit of a fake.