A black light, 0,0,0, is one that adds no illumination to the
scene so naturally it makes no difference. By setting the sliders to negative,
you’re sucking light out of the scene.
The reason for the limits to the range in the gui is because it’s
useful to have that range reflect the commonly used range, while still being
able to go beyond it if you wish to. The light range can in fact go very high
and very low. If that full range were in the gui it would be fiddly trying to
work within the more common 0-1 range.
It’s not so hard to do some typing, is it? ;-)
You can also set the intensity to –ve values.
From: owner-xsi(at)Softimage.COM
[mailto:owner-xsi(at)Softimage.COM] On Behalf Of Eriya Ito
Sent: 29 February 2008 07:38
To: XSI(at)Softimage.COM
Subject: RE: Black light?
That’s it! Thanks, Nick. (well, the specular disappears but… L)
Never had thought of sliding the sliders to anything beyond
visible.
I never got to like that feature where you can go beyond to and
from the actual boundary.
If you can do it, why not be more easier to get to it?
Thanks anyways.
Eriya
From: owner-xsi(at)Softimage.COM
[mailto:owner-xsi(at)Softimage.COM] On Behalf Of Nick
Sent: Friday, February 29, 2008 4:26 PM
To: XSI(at)Softimage.COM
Subject: Re: Black light?
You can, push
the colour into negative values... The trouble is, you may end up with negative
values if you're rendering to float and compers won't like you much, so make
sure you clamp the surface shaders output value or do a clamp on the final
images...
On 29/02/2008, Eriya
Ito <eriya.ito(at)grapecity.com>
wrote:
Might be in a verge of insanity to ask this question but is
there any work around
to add a black light (spot or point)?
I want to light up the whole scene with dark spots in
certain places.
I can use an object as a shadow but can't we have a black
light? J
Thanks,
Eriya
