I compiled pvmega tonight and got some differences compared to normal
mega, look at the images (same
topic) in p.b.i. The first one is standard mega and the second one is
pvmega. 
I used the source from Kari Kivisalos post Realistic radiosity in
p.b.s-f
The image made by pvmega is brighter than the one from mega, most
noticable on the roof, but there
are also some more subtle differences, the small box in pvmega doesn't
have the same inderect lighting
on the forward facing side, it's actaullay darker, and has a sligh
reddish tint in the upper right
corner, mega has a little bit brighter lower left corner and darker
upper right then pvmega has.

There are also some slight differences in the shadow of the large box,
but it's not that noticable
but it's the shadow in the corner, that is, the shadow from the
innermost lefthand lower corner of 
the large box to the corner of the room, there is some differences. And
also on the large box the
lower corner closest to the camera, the red colorbleed is more noticable
than on the image by mega.

/Peter, who hopes anyone understands what he's trying to tell... *tired*

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