[solved]Light / shadow stains

[mrsacan]

Hello,

I'm having a weird problem which I don't remember I have before (with corona renderer)

As you can see, I imported a sketchup model, then I used light material for lighting, both light and ceiling in there are flat surfaces but there are some "stains".
I can't think of any good reason for that, any clue?

[FrostKiwi]

What is your Unit Setup and how far away from the 3dsMax origin are you?
Might me related to accuracy, not exactly a light leak, but still worth a shot.

[grafichissimo]

Overlapping geometry?
Did you try PT+PT if the problem is not visible then set the UHD precision at very high value something like 10.

Good luck.

[mrsacan]

@SairesArt

units are cm, my model was away from origin (easier to update and import something right into a specific place), so I moved to origin and tried a draft render, same result.

@grafichissimo

I also tried to model that ceiling in 3ds max (I thought maybe imported model was not flat or overlapped as you said), still same.

but, I tried PT + PT, it seems fixed that way. So I assume I need higher settings for this scene.

[grafichissimo]

This did happen to me some days ago.
Have a look at the precision setting.

[maru]

This is fixed in Corona 1.5 hotfix 2. Pressing "reset settings" in scene setup is however required for older scenes which were saved with incorrect settings (e.g. UHD Cache precision set to 0,4 - manually changing precision to 1.0 is not enough!).
https://corona-renderer.com/download/