Re: Black light?

Date : Fri, 29 Feb 2008 03:30:20 -0800
To : XSI(at)Softimage.COM
From : "Alan Fregtman" <alan.fregtman(at)gmail.com>
Subject : Re: Black light?
I don't think it works with intensity, Kim. I tried and it kept
staying at 0. Am on 6.02.

   -- Alan

On Fri, Feb 29, 2008 at 2:22 AM, kim aldis <xsi(at)kim-aldis.co.uk> wrote:
>
>
>
>
> 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? ;-)
>
>
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> You can also set the intensity to –ve values.
>
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>
>
> 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
>
>
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>
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> 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

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