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after the sun has set ...

Post here general questions about usage of YafaRay and about the Blender Exporter UI

Re: after the sun has set ...

Post Wed Sep 23, 2009 9:04 am

i changed all the lights to arealights. my first tests look so much better. now i can start tweaking the light amount :-)

both pics with AA 2 passes, 4 samples and 8 inc samples

this is with FG 128
Image

and this with FG 1024
Image

i will also try to see what a spot or sphere light does with the latest know how ...
lightning2911
 
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Re: after the sun has set ...

Post Wed Sep 23, 2009 9:30 am

use big warm-tinted arealights. If you are generous with YafaRay, YafaRay will be generous with you.
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Samo
 
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Re: after the sun has set ...

Post Wed Sep 23, 2009 9:33 am

:D
lightning2911
 
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Re: after the sun has set ...

Post Wed Sep 23, 2009 11:22 am

with the last tips i changed the way i light the scene a little. i am using a spotlight on each side to simulate the shining upwards along the wall and a spotlight from the top down to simulate the original spotlight being redirected by mirrors down again. then i added a larger arealight just to get some more light into the room. might not be physically correct but looks much more the way i wanted it to look.

Image

am rendering the larger and finer version now ...
lightning2911
 
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Re: after the sun has set ...

Post Wed Sep 23, 2009 3:21 pm

Use Blender controls to increase softness of the spotlight edge, now it is not very realistic
http://www.yafaray.org/documentation/us ... jects#Spot

The lighting is still poor IMO.
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Samo
 
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Re: after the sun has set ...

Post Wed Sep 23, 2009 3:32 pm

thanks for the tips i will try that tomorrow. tonight my pc is stuck with rendering something else :-) too much work, too little time!
lightning2911
 
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Re: after the sun has set ...

Post Wed Sep 23, 2009 3:58 pm

condar wrote:
Samo wrote:The problem is not meshlights, the problem is so much geometry so close to light sources. Some very bright paths are bouncing on geometry close to light sources and the image sampling is not able to domesticate those bright paths.

Adding to that problem is the fact that I believe arealights probably use a differerent and more efficient light sampling that mesh lights.

In fact, in your first examples, those crazy bright paths in secondary bounces are able to get into primary rays as well.

For instance in this example I have to use a very contundent sampling strategy, with as many as 1024 FG samples, to get rid of very bright high-contrast FG samples on geometry close to light sources

1024 FG samples x 3 AA samples

maybe a 128 FGsamplesx10 passes strategy?


Yes you are right the strategy you suggest is a good one and faster:
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testfile3.zip
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scene1.png
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Samo
 
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Re: after the sun has set ...

Post Thu Sep 24, 2009 7:28 am

my latest results. one version with sharp spot light and one with soft spotlight.

Image

Image

regarding this
The lighting is still poor IMO.


samo, do you mean the way the lightdesigner wants the lamps to be setup in reality or the way i have translated that in yafaray?
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