100
[%]
4
th
3
rd
7
th
0
th
0
20
40
60
80
bounce
1
st
2
nd
5
th
6
th
4
th
3
rd
7
th
0
th
bounce
1
st
2
nd
5
th
6
th
100
[%]
0
20
40
60
80
Figure1:
Therelativenumberofactive(green)andall(red)
threadsinwarpsafterfirstfewbounces.Thedifferencebe-
tweenthecolumnsexpressesthefractionofinactive(idle)
threads.Theoverallutilizationofprocessingunitsisonly
32%
and
35%
fortheOfficeandConferenceRoom.
0
th
kk
+
l
m
...........
4
th
3
rd
7
th
bounce
1
st
2
nd
5
th
6
th
100
[%]
0
20
40
60
80
Figure2:
Regenerationofpathsthatwereterminatedby
Russianrouletteordidnotintersectthescenegeometry.The
coloremphasizesdifferentpathgenerations,e.g.green,blue,
orredcolorshowtherelativenumberofthreadsthatper-
formedzero,one,ortworestarts,respectively.
Path Regeneration Phase
Closing Phase
(a)Office
(b)ConferenceRoom