How to reduce sun intensity of Sun & Sky Light in Indigo RT

General questions about Indigo, the scene format, rendering etc...
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SerNick
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How to reduce sun intensity of Sun & Sky Light in Indigo RT

Post by SerNick » Tue Aug 16, 2011 1:02 am

Hi

I have problem with Sun & Sky Light. I need to tune down sun component (like in cloudy day ).
In indigo demo a could use light layers for sky and sun, but indigo rt don't support light layers. Is there any other way to do this?
I'll try with env map with blue gradient and one mesh light as a sun, but this is not so good I think...

darkblue
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by darkblue » Tue Aug 16, 2011 11:16 pm

Increase turbidity and then change the white point to something more blue, because increasing turbidity will make Sun/Sky color warmer.

SerNick
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by SerNick » Wed Aug 17, 2011 7:09 am

Unfortunately turbidity don't work for me. I show a litle example:
Turbidity, even extremly high affects sky color and slightly soften shadows.
But what I want is to tune strength of sun from completly off. I attach example from yafaray.
On first image thers no sun component (only sky ambient ). Second image: 90% sky, 10% sun. Last: 50/50.
I need something like in LuxRender where exporter give me the ability to set gain for both: sky and sun component
Attachments
ind.jpg
from indigo
yaf.jpg
From yafaray

FakeShamus
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by FakeShamus » Wed Aug 17, 2011 8:25 am

I would like to +1 this.
many times I like the look of a slightly less intense sun when using the physical sun/sky model, or sometimes I want just the sky. but I don't want the additional light layers (and ram) it requires for my final render. adding a gain parameter to the sun and sky would be very useful.

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Pibuz
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by Pibuz » Thu Aug 18, 2011 12:19 am

Sorry, SerNick.
Do you know that you can split sun and sky layers, do you?

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Headroom
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by Headroom » Thu Aug 18, 2011 12:26 am

Indigo RT does not support light layers.

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Pibuz
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by Pibuz » Thu Aug 18, 2011 12:29 am

OH SORRY! DIDN'T KNOW THAT!

moderator should delete my post..

SerNick
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by SerNick » Thu Aug 18, 2011 2:29 am

I write in first post about Indigo RT don't support light layers. Unfortunately I forget to check it before buying RT :(
I hope it would change with future releases, because it semms to be very useful feature.

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Bosseye
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by Bosseye » Thu Aug 18, 2011 3:55 am

If you're using sketchup you could try this:

1) In Indigo settings set environment from Sun & Sky to Sketchup background (leave 'black' unticked)
2) In sketchup styles, change the model background to a dull grey colour

Not ideal I know, but works to an extent. Images below

Alternatively, do the above but tick 'black' for sketchup background in render settings and then have a massive object somewhere off camera as an emitter to act as your sun which you can set the power of? A bit bodgy, but might work with some trial and error.
Attachments
Test.jpg
Sun & sky default
Test1.jpg
Sketchup background set to grey

SerNick
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by SerNick » Thu Aug 18, 2011 4:22 am

Thank You for advice. I tried with env maps and emiters. Yes it work's but is slower and give more noisy renders.

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Headroom
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by Headroom » Thu Aug 18, 2011 4:36 am

Environment maps can be tricky. Use a lower resolution map for lighting as the higher resolution maps can lead to increased noise.

There are some excellent ones here http://www.openfootage.net that come in high and lowres version.

SerNick
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Re: How to reduce sun intensity of Sun & Sky Light in Indigo

Post by SerNick » Thu Aug 18, 2011 5:37 am

Thank you! Useful tip. Right now I'am testing hdri's from Your's link and results are good.

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