Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] Bug Reporting => [C4D] Resolved Bugs => Topic started by: TomG on 2018-02-08, 18:49:39

Title: Corona Light Material emits light whether Emit Light is checked or not
Post by: TomG on 2018-02-08, 18:49:39
Beta 1, C4D R19 - for me, a Corona Light Material now always emits light regardless of the checkbox setting.

Title: Re: Corona Light Material emits light whether Emit Light is checked or not
Post by: burnin on 2018-02-08, 21:19:51
Confirming issue.
Unchecking "Emit light" makes it emit on both sides - also, adding extra noise to the scene...
eg
(https://i.imgur.com/5Nv8AYM.gif)
Title: Re: Corona Light Material emits light whether Emit Light is checked or not
Post by: Cinemike on 2018-02-08, 22:20:26
A Corona Light material with "Emit Light" turned off is like a Corona material with self-illumination turned on - and it brings the same amount of noise.

See for example: https://forum.corona-renderer.com/index.php?topic=14469.msg92489#msg92489
Title: Re: Corona Light Material emits light whether Emit Light is checked or not
Post by: burnin on 2018-02-08, 23:29:10
Quote from: Cinemike on 2018-02-08, 22:20:26
A Corona Light material with "Emit Light" turned off is like a Corona material with self-illumination turned on - and it brings the same amount of noise.

See for example: https://forum.corona-renderer.com/index.php?topic=14469.msg92489#msg92489

:D
So it's simply bad use of naming convention, since it looks like majority understands unchecking "Emit Light" = "Turn Off the Light" 
... i'd then like to suggest renaming "Emit Light" to "Self illumination" (or alike) & of course accordingly set the checker/switch box action, if it's not a problem ;)
Title: Re: Corona Light Material emits light whether Emit Light is checked or not
Post by: TomG on 2018-02-09, 14:13:54
Unchecking Emit Light should indeed mean "turn the light off" - here's how it looks in Max, working as expected:

Self Illumination in the Corona Mtl always casts light into the scene, which is where the Light material with Emit Light off comes in :)

I think Cinemike was just pointing out that the result with Emit Light on and off does in fact change, but rather than turning off the emitted light, it simply starts acting the same as a CoronaMtl with Self Illumination enabled (based on what is seen in the noise).
Title: Re: Corona Light Material emits light whether Emit Light is checked or not
Post by: burnin on 2018-02-09, 16:58:11
yup, was clear ;)
... feature request then:
- add "self emitter" checkbox
Title: Re: Corona Light Material emits light whether Emit Light is checked or not
Post by: TomG on 2018-02-09, 17:13:51
Still not understanding the feature request, sorry :(

The checkbox that is there already is named correctly, but is not working like it should (and like it does in Max), so that part remains a bug. Beyond that, not sure what feature is being requested?

Thanks!
Title: Re: Corona Light Material emits light whether Emit Light is checked or not
Post by: houska on 2018-02-12, 13:58:52
There actually was one small material flag that we forgot to set. Should be fixed in one of the daily builds.