Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] General Discussion => Topic started by: stereoV on 2018-07-19, 13:01:14

Title: What is corona sun object ´textured´ ?
Post by: stereoV on 2018-07-19, 13:01:14
Hey Buddies,
in the corona sun object there is a hook called ´textured´ under the view size slot. What is it there for ? How can i use it ?

thx guys
Title: Re: What is corona sun object ´textured´ ?
Post by: romullus on 2018-07-19, 13:39:55
You don't need it, unless you rendering sunrise/sunset scene where sun is directly visible. Textured option will make sun's borders appear slightly dimmer, thus increasing realism. AFAIK, it is advisable to keep it off in regular scenes, as it slightly affects performance.
Title: Re: What is corona sun object ´textured´ ?
Post by: maru on 2018-07-19, 16:36:10
this :)
Title: Re: What is corona sun object ´textured´ ?
Post by: burnin on 2018-07-19, 17:45:17
Yup... It's about Limb Darkening. (https://en.wikipedia.org/wiki/Limb_darkening)

Comparison example:
(https://i.imgur.com/I7IUPgd.gif)

& Sunrise demo:
(https://i.imgur.com/6KWq8on.gif)
Title: Re: What is corona sun object ´textured´ ?
Post by: Cinemike on 2018-07-19, 21:00:44
They thought of everything!
Title: Re: What is corona sun object ´textured´ ?
Post by: romullus on 2018-07-19, 21:43:38
No, they didn't, where's the rainbow?! :]
Title: Re: What is corona sun object ´textured´ ?
Post by: Cinemike on 2018-07-20, 01:43:08
Quote from: romullus on 2018-07-19, 21:43:38
No, they didn't, where's the rainbow?! :]

The are also no sun spots, sun flares and a proper eclipse simulation, but I wanted to sound positive ^^
Title: Re: What is corona sun object ´textured´ ?
Post by: romullus on 2018-07-20, 10:00:12
Don't tell me, it even hasn't corona! Can you believe it?!
Title: Re: What is corona sun object ´textured´ ?
Post by: Beanzvision on 2018-07-20, 10:21:01
Quote from: Cinemike on 2018-07-20, 01:43:08
Quote from: romullus on 2018-07-19, 21:43:38
No, they didn't, where's the rainbow?! :]

The are also no sun spots, sun flares and a proper eclipse simulation, but I wanted to sound positive ^^
Those features seem to work for me! ;)
(https://forum.corona-renderer.com/index.php?action=dlattach;topic=21186.0;attach=88304;image)
Title: Re: What is corona sun object ´textured´ ?
Post by: Cinemike on 2018-07-20, 20:04:57
Fake news!
^^
Title: Re: What is corona sun object ´textured´ ?
Post by: Beanzvision on 2018-07-20, 22:17:40
How dare you! ;)
Title: Re: What is corona sun object ´textured´ ?
Post by: Br0nto on 2018-08-29, 20:49:06
Quote from: burnin on 2018-07-19, 17:45:17
Yup... It's about Limb Darkening. (https://en.wikipedia.org/wiki/Limb_darkening)

Comparison example:
(https://i.imgur.com/I7IUPgd.gif)

& Sunrise demo:
(https://i.imgur.com/6KWq8on.gif)

Burnin, how did you manage to get the sun below the level of the horizon?
Title: Re: What is corona sun object ´textured´ ?
Post by: romullus on 2018-08-29, 23:11:44
I think this is just fake horizon :] Currently it's not possible to have Corona sun below horizon - the sun always shines on TV... in Corona.
Title: Re: What is corona sun object ´textured´ ?
Post by: Br0nto on 2018-08-29, 23:21:18
Dang, yeah I'd heard as much so when I saw this animation I was quite surprised. Oh well.
Title: Re: What is corona sun object ´textured´ ?
Post by: Eddoron on 2018-08-30, 17:49:26
fuckin face on the sun. i knew it!
Title: Re: What is corona sun object ´textured´ ?
Post by: burnin on 2018-08-30, 23:48:54
Oh, well...

I've seen almost all CG Sky models being limited by a simple human flaw - a predisposition that planets are flat, thus horizons are straight flat also - but, since i prefer real truth, i mimic nature >>> Earth Curve Calculator (http://dizzib.github.io/earth/curve-calc/index.html?d0=63.634&h0=3.5&unit=metric) ;)

BTW, i think more advanced Environment model is needed in Corona (especially for architectural viz!!!), with added settings & options for atmosphere, haze, color shift, ground, reflection, shadow intensity, horizon height, blur and curvature... better naming conventions (azimuth, zenith..), supporting multiple skies and suns...  would be of great benefit to everyone. Similar to that which iray uses (tho it has no limb darkening) ;)

(https://media.giphy.com/media/ZNBkOOCkrhgfA0LpK1/giphy.gif)
... and it's recorded in real time...