I've been scratching my head for a while over this one (I'm sure it's
something stupid I've done). But I'm exporting from Ecotect using a
100lux overcast sky, rendering with the -i option to get a daylight
factor image. I've narrowed it down to something that looks like
self-luminous ceiling soffits (I've rendered the scene with all the
other objects apart from the floor slabs and it's fine) - tracing the
illuminance value on the roof gives 100Lux as expected, but the floor
slabs are ablaze with light (>1kLux). The image
(http://ndoylend.fastmail.fm/temp/test0_c5.jpg) looks pretty cool, but
it's absolutely useless.
Can anyone shed some light (sorry) on this one?
Nick
The image
(http://ndoylend.fastmail.fm/temp/test0_c5.jpg) looks pretty cool, but
it's absolutely useless.
Cool indeed! I vote for it for the Radiance Gallery!
Can anyone shed some light (sorry) on this one?
Looks like your ceilings and floors are emitting light onto the next plane below.
Check the material definition of the ceiling material. This looks like a glow
(for example from the sky definition) or illum because it seems to emit only in one
direction (the face's front which is pointing down here).
What material or material name did you assign to the ceiling? Did you modify the
Ecotect scene manually?
Regards,
Thomas
···
On 20 Sep 2008, at 22:58, Nick Doylend wrote:
Here's another one:
What's your -av setting? You have a very dark sky and a typical -av value
would increase your lighting levels quite significantly in this situation. At
the edges of the floors/ceilings this would be less noticeable because there
is some sky or ground glow in direct view. In the centre of the planes the -av
setting would brighten up the material when the number of ambient bounces
is exceeded.
It might just be an insane idea I head over my breakfast coffee.
Thomas
···
On 20 Sep 2008, at 22:58, Nick Doylend wrote:
Can anyone shed some light (sorry) on this one?
I think that was it, it must have been good coffee. I found Rad was
setting an ambient value of 10. I added -av 0.01 0.01 0.01 to the .rif
file's render option and got images that weren't so groovy looking but
did give a better indication of something like a reasonable daylight
factor. (http://ndoylend.fastmail.fm/temp/test02_c5.jpg)
This is with an indirect setting of 2. I suppose I should reduce the
ambient value to zero and increase the indirect to get a more realistic
DF, but is it worth it (these are for visualisation only)?
Thanks for the suggestion,
Nick
···
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
Thomas Bleicher
Sent: 21 September 2008 09:22
To: Radiance general discussion
Subject: Re: [Radiance-general] Insane Daylight Factor Rendering
On 20 Sep 2008, at 22:58, Nick Doylend wrote:
Can anyone shed some light (sorry) on this one?
Here's another one:
What's your -av setting? You have a very dark sky and a typical -av
value would increase your lighting levels quite significantly in this
situation. At the edges of the floors/ceilings this would be less
noticeable because there is some sky or ground glow in direct view. In
the centre of the planes the -av setting would brighten up the material
when the number of ambient bounces is exceeded.
It might just be an insane idea I head over my breakfast coffee.
Thomas
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You can increase the -ab to 3 or 4. Beyond that I don't think it would
make a visible difference.
Keep a small value for your '-av' setting. This will also smooth out the
image a bit and if you're not after accuracy you don't have to worry if
the DF gets a bit of a lift.
PS: You're right, the first image looks much cooler!
Thomas
···
On 21 Sep 2008, at 23:29, Nick Doylend wrote:
This is with an indirect setting of 2. I suppose I should reduce the
ambient value to zero and increase the indirect to get a more realistic
DF, but is it worth it (these are for visualisation only)?
