Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: sailor on 2018-03-22, 05:25:53

Title: circular light artifact in cube map
Post by: sailor on 2018-03-22, 05:25:53

Hi,

I created cube map at first time and see strange ceiling light effect. The attached images are a section of cube map looking up the ceiling and camera setting.

The 3D model is 5 story building and those top ceiling lights heavily have circular light effect, the lower ones have less but not perfect when I check it on an online VR panorama viewer. I don't use a tool like Oculus.

Is it because of the Virtual reality(stereo) enabled? How can I get rid of them? Please help.

Title: Re: circular light artifact in cube map
Post by: maru on 2018-03-22, 12:56:46

Hi, this is because bloom and glare effects cannot be used with cube map projection right now. The only supported format is spherical. I am afraid that disabling bloom and glare is the only solution here.
It can be later added in 3rd party post-production as processing cube maps is easier than spherical maps anyway.

Of course fix is planned, but there is so much to do currently.

Title: Re: circular light artifact in cube map
Post by: sailor on 2018-03-22, 13:25:12

Thank you, Maru. How about setting those light invisible to camera? Do they still show up? I have them visible to camera now.

Title: Re: circular light artifact in cube map
Post by: maru on 2018-03-23, 10:49:47

Quote from: sailor on 2018-03-22, 13:25:12

Thank you, Maru. How about setting those light invisible to camera? Do they still show up? I have them visible to camera now.

If you make lights invisible to camera, then they will be invisible to camera. I don't quite understand what your comment was about.

The issue seen in your picture is because of bloom and glare. If you disable bloom and glare, everything will be fine, and then you can add it in some 3rd party post-production soft.

Title: Re: circular light artifact in cube map
Post by: Frood on 2018-03-23, 14:00:15

... or render a spherical and reproject to cube (If you really need cube)...


Good Luck

Title: Re: circular light artifact in cube map
Post by: sailor on 2018-03-24, 03:37:41

Sorry for confusion. I'm so used to Vray and it had a feature that makes its light source visible or invisible to camera. Either way, they illuminate the scene but you see their bright light source or not.

I'll stick to equirecutangular for now.

Title: Re: circular light artifact in cube map
Post by: TomG on 2018-03-24, 13:38:18

You can do that with a Corona Light too, control whether it is visible directly, visible in reflections, etc. Bloom and Glare then wouldn't have that bright light source to generate Bloom and Glare - but, Bloom and Glare would still be distorted in a cube map, whatever generates it, and so best not to use B&G with cube maps :)

Title: Re: circular light artifact in cube map
Post by: sailor on 2018-03-25, 08:19:28

Thanks for your reply, Tom. I tried that on and off and found more or less sweet spot.