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Chaos Corona for Cinema 4D => [C4D] General Discussion => Topic started by: iacdxb on 2018-11-28, 12:22:18

Title: Bloom and Glare on Selected object..?
Post by: iacdxb on 2018-11-28, 12:22:18

Hi,

Gold metal ring and inside some light bulbs. I added some bloom and glare but its effecting ring also, can I disable bloom and glare form gold ring....?
I have to do two renders... with and without bloom and glare....?
Also I did not saw any include exclude option for bloom and glare..!

Thanks.
...

Title: Re: Bloom and Glare on Selected object..?
Post by: tuami on 2018-11-28, 15:01:00

Can you provide us with a demo scene?

Title: Re: Bloom and Glare on Selected object..?
Post by: TomG on 2018-11-28, 15:19:05

Bloom and Glare is a 2D process (like in the real world, where it occurs due to the lens) and is based purely on pixel intensity, so at the moment (like the real world) there is no turning it on and off for specific objects etc. (so one thing to consider is the light intensity, and manipulating the Threshold parameter, to limit it to things of a particular brightness, which can be above 1 in the Threshold for things that exceed RGB 255,255,255 as far as I know)

Title: Re: Bloom and Glare on Selected object..?
Post by: FrostKiwi on 2018-11-28, 16:52:03

Quote from: iacdxb on 2018-11-28, 12:22:18

Hi,

Gold metal ring and inside some lights. I added some bloom and glare but its effecting ring also, can I disable bloom and glare form gold ring....?
I have to do two renders... with and without bloom and glare....?
Also I did not saw any include exclude option for bloom and glare..!

Thanks.
...

Yes you can.

1. Use render selection (https://coronarenderer.freshdesk.com/support/solutions/articles/5000675887-using-area-to-render-selected-with-no-selected-objects-in-the-viewport-an-empty-scene-will-be-ren) to render just the lights.
2. Export Bloom / Glare pass. (If some are brighter than white, export with floating point.)
3. Export Beauty pass (of whole scene). (If some are brighter than white, export with floating point.)

Either use 3dsMax Material editor or Photoshop or Gimp:
Put Bloom above Beauty pass using Additive mode / Add blending /  (Called Linear Dodge in older Photoshops)

Title: Re: Bloom and Glare on Selected object..?
Post by: iacdxb on 2018-11-29, 15:22:20

Thanks guys.

Saved with and without bloom & glare and fixed in PS.

Thanks.
...

Title: Re: Bloom and Glare on Selected object..?
Post by: iacdxb on 2018-12-09, 13:05:14

I think this request feature will be better....!

Instead of two renders.... It is not nice to have include and exclude panel for Bloom and Glare as like Light have include / Exclude.

Thanks.
...

Title: Re: Bloom and Glare on Selected object..?
Post by: houska on 2018-12-10, 09:34:04

Quote from: iacdxb on 2018-12-09, 13:05:14

I think this request feature will be better....!

Instead of two renders.... It is not nice to have include and exclude panel for Bloom and Glare as like Light have include / Exclude.

Thanks.
...

Imran, unfortunately this is not so easy as one would imagine. For example - what about mirrors, reflection highlights, refraction (i.e. all windows), light dispersed through fog, global illumination, ... Basically, you're not so easily able to find out, whether the light comes from the given Light object or not. Or rather, you're able to find this out, but as a user, you'd find out that this criterion would often mean that you'd have bloom and glare where you don't want it and you'd miss it in places, where you want it. This is the same as with "prevent black appearance" for example - that's why directional lights in mirrors will still be black even with "prevent black appearance".

Title: Re: Bloom and Glare on Selected object..?
Post by: iacdxb on 2018-12-10, 16:50:33

Thanks Houska for detailed reply.

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