Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: Kristoffer Andersen on 2014-11-03, 15:44:00

Title: Bright spots in rendering
Post by: Kristoffer Andersen on 2014-11-03, 15:44:00

Hi. I did a render of a low-poly surgical lamp, and noticed two artifacts in the image. 1 small pixel-artifact (which I've experienced before) and the yellow halo on the background. Im not sure if it's an artifact, but the material on the wall has rounded corners enabled, but there are no edge at that point; the models are intersecting eachother. That render is actually 3800 passes..

(http://i62.tinypic.com/2cmrtjp.jpg)

(http://i61.tinypic.com/2iudrwz.jpg)

Title: Re: Render artifact(?)
Post by: Ondra on 2014-11-03, 17:07:04

Is the wall/ceiling slightly glossy?

Title: Re: Render artifact(?)
Post by: Kristoffer Andersen on 2014-11-03, 21:24:46

Yes! I believe the wall has a glossiness of about 0,7 and somewhat grey-white reflection color so that's correct and I believe the ceiling has very very low reflectivity/refl. glossiness settings..

Title: Re: Render artifact(?)
Post by: Ondra on 2014-11-03, 22:16:18

then this behavior is most likely normal - since the normal changes smoothly at the ceiling, it is picking some highlights from the scene

Title: Re: Render artifact(?)
Post by: demmi on 2014-11-04, 00:25:18

if u dont tell me i would never find that artifact LOL
if was my image i would go to photoshop =) you have a good eye

Title: Re: Render artifact(?)
Post by: borisquezadaa on 2014-11-04, 04:21:33

I thought for a moment that had a dead pixel.

Title: Re: Render artifact(?)
Post by: Kristoffer Andersen on 2014-11-04, 11:33:05

I re-rendered a few passes of the same view, but disabled all reflection and rounded corner-settings on both shaders. Seems to me the problem still presents itself? Also, you can see how the two objects intersects..

(http://i60.tinypic.com/r8e1ok.jpg)

OT: What sites do people usually upload images from on this forum? Im not used to BB code bus afaik I cant upload images straight from my PC?

Title: Re: Render artifact(?)
Post by: romullus on 2014-11-04, 11:58:45

Quote from: Kristoffer Andersen on 2014-11-04, 11:33:05

OT: What sites do people usually upload images from on this forum? Im not used to BB code bus afaik I cant upload images straight from my PC?

You can use forum attachments system for that. Look under text input field whan typing new post.

Title: Re: Render artifact(?)
Post by: Kristoffer Andersen on 2014-11-04, 12:03:32

I use glasses but apparently I'm still blind; Thank you, sir!

Title: Re: Render artifact(?)
Post by: Ludvik Koutny on 2014-11-04, 13:12:35

That looks like leak. There's a tiny gap between the geometry. Just seal it by moving verticles so the two objects or faces overlap.

Title: Re: Render artifact(?)
Post by: Kristoffer Andersen on 2014-11-04, 15:50:45

That's what I tried to pinpoint in the image I posted; the faces already do overlap. The ceiling the one in seethrough shading (alt+x) and the other is the beam.

Title: Re: Render artifact(?)
Post by: Ludvik Koutny on 2014-11-05, 11:12:27

Using Rounded corners feature by any chance?

Title: Re: Render artifact(?)
Post by: Coronaut on 2014-11-05, 21:21:49

cap holes if there is any(only if you have open polygons) if that doesn't sort this problem out try adding shell modifier to the ceiling if it's plane...

Title: Re: Render artifact(?)
Post by: Ondra on 2014-12-08, 18:03:49

ok, the single pixel is probably some random reflection and is therefore normal. The light leaks - could you send me the scene? https://corona-renderer.com/upload/