[Radiance-general] Problem with getting correct irradiance from
sky dome
Claus B. Madsen
cbm at cvmt.aau.dk
Fri Nov 23 01:50:17 PST 2007
Hi Greg,
thanks for the super advice (and for Radiance :-)
Switching from light to glow solves the irradiance level problem. Now my
problem (of course) is: I don't get "slightly dark patches" beneath
objects standing on the ground plane as you would expect (due to partial
occlusion of the incoming radiance from the sky dome). I.e., this use of
glow (I dunno what to set maxrad to since the glow material is not
applied to any geometry but just used for an infinitely distant skydome)
doesn't allow the Sky dome to cast shadow.
... eh, and yes ... thanks for teaching me the Ropes of Radiance
Best,
Claus
Greg Ward wrote:
> Hi Claus,
>
> You need to specify the sky as a "glow" source -- sources that large
> are not accurately modeled in the direct calculation. See:
>
> http://radsite.lbl.gov/radiance/digests_html/v2n5.1.html#SKY
>
> I suppose the renderer should issue a warning or something, but
> Radiance is kind of like a big pile of rope to hang yourself with.
>
> Best,
> -Greg
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