Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] Bug Reporting => [C4D] Resolved Bugs => Topic started by: Cinemike on 2022-09-30, 21:43:21

Title: 100% light directionality isn't that
Post by: Cinemike on 2022-09-30, 21:43:21

I have an area disc light with 100% directionality, but the light still disperses conically - otherwise it would stay parallel and just illuminate the cylinder cap.
Bad for laser effects in fog.

Michael

C4D 2023.0, Corona V9 RC1, Windows 10

Title: Re: 100% light directionality isn't that
Post by: TomG on 2022-09-30, 22:33:16

Have you tried passing it through a hole after it is set to 100% directionality?

Title: Re: 100% light directionality isn't that
Post by: burnin on 2022-09-30, 22:58:59

We already had a couple of Q's about this here:
 Spot light beam angle and CoronaLight Directionality (https://forum.corona-renderer.com/index.php?topic=32800.msg183392#msg183392)

Do as advised by TomG, there's no other way (for now).

Title: Re: 100% light directionality isn't that
Post by: Cinemike on 2022-10-01, 21:43:07

Quote from: TomG on 2022-09-30, 22:33:16

Have you tried passing it through a hole after it is set to 100% directionality?

To my surprise this did not help/work either.

Title: Re: 100% light directionality isn't that
Post by: Cinemike on 2022-10-01, 21:47:33

Quote from: burnin on 2022-09-30, 22:58:59

We already had a couple of Q's about this here:
 Spot light beam angle and CoronaLight Directionality (https://forum.corona-renderer.com/index.php?topic=32800.msg183392#msg183392)

Do as advised by TomG, there's no other way (for now).

Thanks for the links.
So there is nothing but to wait and wonder.

Title: Re: 100% light directionality isn't that
Post by: burnin on 2022-10-01, 23:17:35

or you could model a laser,
but note, since light source is "hard to find" & experimental bidir VCM engine is no longer available (+ I'm not aware, nor have I experimented to check, if there's any other new engine/tech in Corona for such cases), I'd expect "noise & long gone days"

Title: Re: 100% light directionality isn't that
Post by: Cinemike on 2022-10-01, 23:25:11

Quote from: burnin on 2022-10-01, 23:17:35

or you could model a laser,
but note, since light source is "hard to find" & experimental bidir VCM engine is no longer available (+ I'm not aware, nor have I experimented to check, if there's any other new engine/tech in Corona for such cases), I'd expect "noise & long gone days"

For now I am going with thin cylinders with a lightmaterial.
Although I am not worried about render times. I won't be the one rendering it ;)

Title: Re: 100% light directionality isn't that
Post by: Beanzvision on 2022-10-03, 12:44:47

Maybe faking it with a spline might pass? ;)

(https://forum.corona-renderer.com/index.php?action=dlattach;topic=37995.0;attach=172101;image)

Title: Re: 100% light directionality isn't that
Post by: Cinemike on 2022-10-03, 17:24:52

I hadn't even noticed that spline rendering was in already, nice! Cool update (the chemtrails are cool, too ;))

What both spline rendering and my cylinder substitute are missing, though, is the interaction with the fog medium. Lasers are invisible per se, just passing through "fog" makes them visible, so a noisy fog just does that. I can fake it with opacity noise in the (light) material.