Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: mrsacan on 2016-11-17, 13:17:10

Title: Translucent object and its reflection
Post by: mrsacan on 2016-11-17, 13:17:10: Hi,

So as you can see in image, I used translucent material for curtain. I have an exr (no model outside) for environment, I used coronasky for direct visibility (environment override).
What I don't understand is, why curtains reflection is much brighter than actual sky?
Title: Re: Translucent object and its reflection
Post by: maru on 2016-11-21, 14:00:33: What version of Corona is this?

-You are using exr in environment slot.
-You are using Corona Sky for direct visibility.
-Are you also using some reflection/refraction override?

Is there a chance that the map which is used for lighting (environment) is brighter than what is visible directly?
Title: Re: Translucent object and its reflection
Post by: mrsacan on 2016-11-22, 07:19:04: corona 1.5 hotfix 2

attached some samples with variations

exr may be brighter than coronasky, I really don't know how to measure without rendering one by one
Title: Re: Translucent object and its reflection
Post by: Ludvik Koutny on 2016-11-22, 08:31:18: It's not a bug. That's how it's supposed to work. The ceiling reflects relatively dark ground color of CoronaSky and bright color of the curtain. Curtain scatters light in all directions, including towards the ceiling, where as glass does not scatter any light, and just passes through color of the CoronaSky ground. If you place your camera at that exact place where the reflection occurs, and point that camera down towards window, you will see what kind of lighting arrives there, and you will see that from the point of reflective ceiling, curtain indeed appears a lot brighter.
Title: Re: Translucent object and its reflection
Post by: mrsacan on 2016-11-22, 09:02:07: @rawalanche

i didn't think it was a bug, I posted this to "general discussion" just because of my curiosity, but some of you moved this into "bug" / "i need help" category

¯\_(ツ)_/¯
Title: Re: Translucent object and its reflection
Post by: romullus on 2016-11-22, 11:00:00: I can't see nothing wrong with the board your thread is in at the moment. This isn't bug reporting board, but a place where you can post questions about something you don't know or don't understand and would appreciate some help from fellow forum members or Corona Team themselves.
Title: Re: Translucent object and its reflection
Post by: Ludvik Koutny on 2016-11-22, 13:12:21: It was more of a generally pointed statement :) To save Maru some time he could spend searching for a bug or scene setup error :)
Title: Re: Translucent object and its reflection
Post by: maru on 2016-11-22, 15:39:26: Ok. So this simply means that my imagination is working worse and worse proportionally to the level of tiredness. ;)