Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] General Discussion => Topic started by: Jpjapers on 2016-01-20, 09:36:43

Title: Large areas and corona lighting VERY slow
Post by: Jpjapers on 2016-01-20, 09:36:43

Hi, im not sure if this is a bug or if its just simply the size of my scene but ive noticed that even if you use a small number of lights (less than 25) in a vast area (about 100,000sqft) corona is just ridiculously slow during precalc and during rendering and can take anything up to 10 minutes to begin rendering and about the same to successfully cancel the render and resume editability ijn max.
Any ideas how i can rectify this?

Thanks
Jack

Title: Re: Large areas and corona lighting VERY slow
Post by: Ondra on 2016-01-20, 10:06:26

can you send us an example scene, or at least renders of the scene, with the stats tab of VFB visible?

Title: Re: Large areas and corona lighting VERY slow
Post by: Jpjapers on 2016-01-20, 10:18:32

I can probably send you the render data but im not sure i can send the file as its a live scheme we are working on at work. Ill get those stats posted soon though.

Title: Re: Large areas and corona lighting VERY slow
Post by: Jpjapers on 2016-01-20, 11:47:56

i havent got the stats yet but whats interesting is that if i apply a light material to my ceiling (like a suspended tile style light gird) and render that, its much much faster and easier to cancel and start than if i had say 20 lights that were very long and thin, (im talking 250mm x 50000mm, simulating huge long led strips)

Title: Re: Large areas and corona lighting VERY slow
Post by: maru on 2016-01-20, 12:16:59

I also think an example scene would be required. Or instructions how to reproduce this.
Are you getting any error messages or warnings from Corona?

Title: Re: Large areas and corona lighting VERY slow
Post by: Jpjapers on 2016-01-20, 14:41:56

No errors, ive noticed the RAM useage climbing up towards the 30GB mark. Like i say its a huge scene. I might be able to send the file but its really not up to me unfortunately.

Title: Re: Large areas and corona lighting VERY slow
Post by: Ondra on 2016-01-20, 19:33:20

I would be interested in the stats panel screenshot. my best guess is applying light material to too many polygons (instancing is disabled in this case)

Title: Re: Large areas and corona lighting VERY slow
Post by: Jpjapers on 2016-01-20, 22:08:56

the light material is on 8 polygons. they just happen to be 8 very large polygons haha. ill post a screenshot tomorrow.

Title: Re: Large areas and corona lighting VERY slow
Post by: Ondra on 2016-01-20, 22:35:07

does the light have texture on it?