Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] General Discussion => Topic started by: Jeff Grigsby on 2019-02-05, 15:21:44

Title: Corona Distance Shader slows scene to a crawl
Post by: Jeff Grigsby on 2019-02-05, 15:21:44

am I do something wrong, just moving geo around the scene cause Max to hang up for 30 seconds, I assume it the corona map distance always calculating  causing this. There should be some kind of global check box to only calculate at render time or scenes can become unusable.

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: Jeff Grigsby on 2019-02-05, 15:42:23

After running a few test this absolutely is the case. I can understand why a person would want to have it calculate all of the time for propagating trees in scatter, or using as a physical displacement, but if you are using Corona distance map to blend materials and have several in your scene, it brings scene speed down to a crawl. This needs to be addressed, there should be some sort of global override that only calculates this at render time.

jeff

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: maru on 2019-02-05, 15:52:00

Hi, can you send us a scene (even very simple) where this can be observed, and instructions how to reproduce it? (just hit render? or start IR?)
You can use this uploader and let us know here what was the file name: https://corona-renderer.com/upload

Thanks in advance!

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: Jeff Grigsby on 2019-02-05, 16:33:00

Hey, thanks for the quick response.  I will send you the problem geo from the old scene later today.  I love the feature, but I may have figured out how to break it because this has yet to happen to us.

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: pokoy on 2019-02-05, 16:41:39

Yeah, that would be a solution. The more objects distance map has to consider the slower it gets, a checkbox for rendertime only would be great, but instead of a global setting, it should be set per distance map.

Is the lag you get present while rendering with IR only? I've learnt the hard way to avoid doing any changes to the map or the distance objects while IR is running, it's either unstable or locks up Max for a... while.

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: Jeff Grigsby on 2019-02-05, 17:04:57

I am talking about view port lag. I feel like this shader is ramming out my video card, anyone confirm where this map is being stored, because I know I can create real time displacements in the viewport from it, so it so it is either  resident in ram, or the video card's ram.

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: pokoy on 2019-02-05, 19:16:00

That happens usually if you have many objects added to a distance map or have multiple maps and you move any of these or edit them in some way. If the material editor is open and displays a map or material using these maps it gets a lot worse, closing it may help. Collapsing these objects so the object list to update is shorter helps too. Not feasible in many situations, though.

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: matsu on 2019-02-11, 16:34:15

Quote from: pokoy on 2019-02-05, 16:41:39

a checkbox for rendertime only would be great, but instead of a global setting, it should be set per distance map.

Agreed! I don't really use distance map due to this reason.

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: maru on 2019-02-15, 14:10:00

Has someone already sent a scene demonstrating this to us? The uploader is in my signature. After the upload, please let me know what's the file name.
We will definitely look into this.

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: sprayer on 2019-02-16, 10:37:25

maru
Not sure if this is the same issue, i fond long ago examples scenes for distance map is very slow to render, for example that with render boolean scene, i think SSS material rendering faster

Title: Re: Corona Distance Shader slows scene to a crawl
Post by: maru on 2019-02-20, 13:48:34

Quote from: maru on 2019-02-15, 14:10:00

Has someone already sent a scene demonstrating this to us? The uploader is in my signature. After the upload, please let me know what's the file name.
We will definitely look into this.

^this :)