I figure that subject line will get some attention :-)
Well, to explain myself, I checked 3 renders against each other (by eye, not
extensively) concerning render time and appearance. I was stunned to find a
16 X slower render without any visible benefit from it. A low count of 50
and recursion of 1 took a mere 19 minutes and 11 seconds. Then using count
100 recursion_limit 2 it went to 5 hours and 15 minutes! Without radiosity
at all was a 5 min 42 sec render.
The peak memory amount really jumps too. I mean, wow, is that really needed
when the 6 minute render looks okay? At most the 20 minute one...
I have to add that the 3rd image actually did finish but I stupidly
rerendered using the same filename to make sure about the non-radiosity one.
Luckily I had screen captured it before that. Believe me, no noticeable
difference between the recursion 1 and 2 except for a texture change on the
chimney I did in the script.
Following are excerpts from those stats in WinMegaPov 0.5a:
----------------------------------------------------------------------------
No radiosity, it was skipped using #if(), statistics even so?
----------------------------------------------------------------------------
Radiosity samples calculated: 38461 (5.26 percent)
Radiosity samples reused: 692156
----------------------------------------------------------------------------
Smallest Alloc: 26 bytes Largest: 49200
Peak memory used: 5463401 bytes
----------------------------------------------------------------------------
Time For Parse: 0 hours 0 minutes 1.0 seconds (1 seconds)
Time For Trace: 0 hours 5 minutes 41.0 seconds (341 seconds)
Total Time: 0 hours 5 minutes 42.0 seconds (342 seconds)
Total cache size: 16880
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Radiosity with count=50, recursion=1, error bound=0.36
----------------------------------------------------------------------------
Radiosity samples calculated: 38461 (5.26 percent)
Radiosity samples reused: 692156
----------------------------------------------------------------------------
Smallest Alloc: 26 bytes Largest: 49200
Peak memory used: 11965226 bytes
----------------------------------------------------------------------------
Time For Parse: 0 hours 0 minutes 1.0 seconds (1 seconds)
Time For Trace: 0 hours 19 minutes 10.0 seconds (1150 seconds)
Total Time: 0 hours 19 minutes 11.0 seconds (1151 seconds)
Total cache size: 16880
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Radiosity with count=100, recursion=2, error bound=0.321
----------------------------------------------------------------------------
Radiosity samples calculated: 410694 (4.31 percent)
Radiosity samples reused: 9126101
----------------------------------------------------------------------------
Smallest Alloc: 26 bytes Largest: 49200
Peak memory used: 77512206 bytes
----------------------------------------------------------------------------
Time For Parse: 0 hours 0 minutes 1.0 seconds (1 seconds)
Time For Trace: 5 hours 10 minutes 9.0 seconds (18609 seconds)
Total Time: 5 hours 10 minutes 10.0 seconds (18610 seconds)
Total cache size: 16880
----------------------------------------------------------------------------
I know there are scenes that do wonderfully but this apparently was a flop.
Bob
--
omniVerse http://users.aol.com/persistenceofv/all.htm
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