Hello experts,
playing around with the new integrated photon mapping I met the following strage effect.
First I am using the old version (Radiance 3.7 and Photon map patch 4.3.1) and this very simple geometry (sorry for the german notes):
# LED als IES-Verteilung
# strahlt in Richtung der x-Achse
!xform LED.rad | xform -ry -90 -t -0.2 0 0
# Umlenkspiegel als Metal
void metal spiegel
0
0
5
0.9 0.9 0.9 1 0
!gensurf spiegel mir ?-0.25+s*0.5? ?-0.25+t*0.5? ?0? 1 1 | xform -ry -135
# Testflaeche
void plastic weiss
0
0
5
0.8 0.8 0.8 0 0
!gensurf weiss test ?-4+s*8? ?-4+t*8? ?-2? 1 1
A caustic map is generated like this: mkpmap -apc map2 1000000 -dp 50000
And based on that rad file:
# Rad Input File created by trad Son Aug 2 11:57:29 CEST 2015
DETAIL= Medium
EYESEP= 1
INDIRECT= 1
OCTREE= Dir_Pmap.oct
PENUMBRAS= True
PICTURE= Dir_Pmap
QUALITY= Medium
RESOLUTION= 1024
UP= Z
VARIABILITY= High
ZONE= Interior -4 4 -4 4 -2 0.5
render= -apcb map2 100 2000
scene= System_Pmap.rad
view= g1 -vtl -vp 0 0 -0.5 -vd 0 0 -1 -vu 0 1 0 -vh 8.5 -vv 8.5
I get this output: https://dl.dropboxusercontent.com/u/27495200/HGF.jpg
If I change the roughness for the "spiegel" material to 0.1, I get this output: https://dl.dropboxusercontent.com/u/27495200/RoughF.jpg
which seem to be quite Ok for me.
Now I change to the radiance HEAD from the 4th July. I use the same geometry and the following rad file:
# Rad Input File created by trad Son Aug 2 11:59:05 CEST 2015
DETAIL= Medium
INDIRECT= 0
OCTREE= Pmap1.oct
PCMAP= map3 1000000 50
PENUMBRAS= True
PICTURE= Pmap1rough
QUALITY= Medium
RESOLUTION= 1024
UP= Z
VARIABILITY= High
ZONE= Interior -4 4 -4 4 -2 0.5
mkpmap= -dp 50000
scene= System_Pmap.rad
view= g1 -vtl -vp 0 0 -0.5 -vd 0 0 -1 -vu 0 1 0 -vh 8.5 -vv 8.5
With the roughness of 0.0 I get this output: https://dl.dropboxusercontent.com/u/27495200/HGnF.jpg
Which, compared to a run with mirror material, seems to be even better than the old result.
But when I change to the roughness 0.1 I get this output: https://dl.dropboxusercontent.com/u/27495200/RoughnF.jpg
I already tried differend setting for the bandwidth parameter but the were no fundamental chages.
May thanks for any ideas
Martin Klingler