[Radiance-general] Problem with getting correct irradiance from sky dome

[Claus B. Madsen]

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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: cbm.vcf
Type: text/x-vcard
Size: 391 bytes
Desc: not available
Url : http://radiance-online.org/pipermail/radiance-general/attachments/20071123/768b9774/cbm.vcf