[Radiance-general] Lighting from a light probe

[Tarik Rahman]

Yeah I'm pretty sure it's the spherical light probe that the code is for. I
don't know if it matters what the up vector, azimuth and elevation angles are
from the .pic file and because I think HDRShop reads the view parameters and
converts it to a .hdr light probe correctly.

Quoting Santiago Torres <tiago at tkh.att.ne.jp>:

> Hi Tarik,
> I`ve never used a mirror sphere, but have mapped to source. You have to look
> that the .cal file corresponds to the kind of light probe you are using
> (i.e. that the directions are transated correctly into pixel coordinates)
> I think Debevec uses at least two kind of light probes, cubic and spherical.
> Maybe that`s the problem?
> HTH,
>
> Santiago
>
>
>
>
> > -----Original Message-----
> > From: radiance-general-bounces at radiance-online.org
> > [mailto:radiance-general-bounces at radiance-online.org]On Behalf Of
> > Tarik Rahman
> > Sent: Friday, January 28, 2005 1:19 AM
> > To: Radiance general discussion
> > Subject: [Radiance-general] Lighting from a light probe
> >
> >
> > Hi
> > I'm trying to light a room with the light that's irradiated onto
> > a mirror sphere
> > in order to insert synthetic objects into the room. In radiance I
> > take a close
> > up .pic of the mirror sphere and convert it to a light probe
> > using HDRShop. Do
> > I use same code as in Debevec's tutorial, you know
> > void colorpict hdr_env
> > 7 red green blue lp_smallMirr.hdr angmap.cal sb_u sb_v
> > 0
> > 0
> >
> > hdr_env glow env_glow
> > 0
> > 0
> > 4 1 1 1 0
> >
> > !genbox env_glow room 50 30 50 -i | -t 2.5 2.85 2.5
> >
> > for the lighting? Will angmap.cal work for any light probe or do
> > I have to write
> > my own because when I render this, the reflections from the light
> > probe aren't
> > mapped onto the walls of the room properly?
> >
> > Thanks for any help
> >
> > Tarik
> >
> >
> > --
> > Tarik Rahman
> > PhD student, Institute of Perception, Action and Behaviour
> > School of Informatics
> > University of Edinburgh
> >
> > _______________________________________________
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> > Radiance-general at radiance-online.org
> > http://www.radiance-online.org/mailman/listinfo/radiance-general
> >
> >
>
>
>
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--
Tarik Rahman
PhD student, Institute of Perception, Action and Behaviour
School of Informatics
University of Edinburgh