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June 22nd, 2007
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#1 (permalink) |
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Senior Member
Join Date: Feb 2003
Location: Norwich, UK
Age: 28
Posts: 248
Name: Derek Jackson    |
Faking a cloudy day
Hi,
I'm wanting to create a scene simulating a cloudy but bright day. I don't want to use the sun as it would be obscured by the clouds, but I want a degree of soft shadows. My HDRI maps aren't much use as their resolution is too low, and the good ones I do have are all bright, sunny days. I've heard a trick is to use a large emitter to diffuse the light, but I'm having trouble getting a realistic colour and shadow strength. Has anyone tried this? Any idea of good emitter settings? I'm also not sure how big / far away to make the emitter. Cheers for any help! Derek |
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June 22nd, 2007
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#2 (permalink) |
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Veteran Member
Join Date: Dec 2003
Location: chicago
Age: 30
Posts: 1,980
Name: Tom Livings  |
Re: Faking a cloudy day
Do a little reading about the behaviour of light, you will benefit alot.
Your hdri maps do not have to be high resolution, especially for an overcast day. The only time you'll need a sharp HDRI environment is for reflections and getting crisp shadows with pure hdri (very difficult). HDRI's are usually blurred intentionally and lower res to reduce render times, with virtually no quality penalty.
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http://thomaslivings.blogspot.com/ |
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June 22nd, 2007
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#4 (permalink) |
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Junior Member
Join Date: Jun 2005
Location: Karlsruhe
Age: 34
Posts: 21
Name: Per Becker  |
Re: Faking a cloudy day
here are some free hdri's from evermotion - some overcast skies too
  http://www.evermotion.org/index.php?...fold=exclusive they are 4000x2000pix - not very big don't know if the quality is high enough...  |
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