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Support => Terragen Support => Topic started by: AP on August 04, 2015, 08:46:13 PM

Title: Painted shader and SSS issue
Post by: AP on August 04, 2015, 08:46:13 PM
I would like to know why there is a grey color along my masked region. I have never run into this problem before so i am confused as to what is causing it. All i need is some large scale negative displacement to work here without that color being there.
Title: Re: Painted shader and SSS issue
Post by: Matt on August 04, 2015, 09:33:20 PM
If you have strong negative displacement there, perhaps it is atmosphere. Its density increases exponentially as altitude decreases.

Matt
Title: Re: Painted shader and SSS issue
Post by: AP on August 04, 2015, 10:22:59 PM
That was one of the first thoughts i had but i wonder what is causing the grey color. I changed the haze color to red to see if it was the haze and it was not that. The atmosphere is all blue. I do not think it is a shadow. I did disable the atmosphere and the spot disappeared. Just odd.
Title: Re: Painted shader and SSS issue
Post by: AP on August 04, 2015, 10:30:47 PM
I changed the atmosphere color and yes, it is the atmosphere.
Title: Re: Painted shader and SSS issue
Post by: Matt on August 04, 2015, 10:36:31 PM
A dense enough atmosphere will converge on the "horizon colours" of the atmosphere. There is a Haze horizon colour which the haze converges to, and this defaults to grey. There is also a Bluesky horizon colour which the "bluesky" component converges to, which defaults to a slightly-blueish grey. So even if your haze density is 0, your bluesky density has the potential to converge on a blueish grey colour if the atmosphere gets dense enough or you look through a large enough distance.

Matt
Title: Re: Painted shader and SSS issue
Post by: AP on August 05, 2015, 02:39:19 AM
OK, that makes sense. Thank you. At least i know now what the issue is.    :)