[Radiance-general] rtcontrib issue (stuck on p.16 of understanding rtcontrib tutorial)

[Greg Ward]

You can check if an image is all-black by running "pextrem" on it and checking the output.

-Greg

> From: Ji Zhang <hope.zh at gmail.com>
> Date: June 30, 2012 9:44:55 PM PDT
> 
> Dear list, following Kyle's post:
> 
> I was trying to render an image for the view from the back of the room regarding the contribution from each of the 145 sky patches (Axel's tutorial pp. 17)
> 
> The 146 individual sky patches hdr sterographic images are stored in the "145_patches_rcontrib" directory.
> 
> Then I ran the following bash shell script:
> 
> DIMS=600
> vw="-x $DIMS -y $DIMS -vf ./views/back.vf"
> vwrays -ff $vw | rcontrib -bn 146 @./rtc.opt \
> -fo -ffc $(vwrays -d $vw) -f tregenza.cal -b tbin \
> -o ./145_patches_rcontrib/p%03d.hdr -m sky_glow \
> -w ./testroom_whitesky.oct
> 
> Each of the 146 sky patch hdr images was replaced by a room view rendering. However, some of the hdr images seem to have problem and can't be open with PhotoSphere, such as p001-008, p024-038, p054-066, p080-090, p104-113, p123-129, p137-140, and p144
> 
> May I ask if this is because no contribution from these specific sky patches to the visible surfaces can be identified from this point of view at the back of the room (e.g. the sky patch is "behind" the vertical window plane judging from the change of the shadow pattern of the renderings) ?
> 
> Thanks! 
> - Ji 
> 
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