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Trying to whip up a spiroform compact fluorescent light bulb, all seemed
well until I flicked on the high ambient and radiosity. It took freakin'
4 hours for a little 320x320 swatch!
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Scene Statistics
Finite objects: 562
Infinite objects: 1
Light sources: 6
Total: 569
Render Statistics
Image Resolution 320 x 320
Pixels: 117663 Samples: 260097 Smpls/Pxl: 2.21
Rays: 25682366 Saved: 2994586 Max Level: 15/15
Ray->Shape Intersection Tests Succeeded Percentage
Box 12167475 6235321 51.25
Cone/Cylinder 52542338 26269426 50.00
CSG Intersection 19066704 10143355 53.20
CSG Union 15876905 15818031 99.63
Plane 42394448 12473732 29.42
Sphere 34522020 32168741 93.18
Sphere Sweep 62860863 30115671 47.91
Torus 31929828 8356481 26.17
Torus Bound 31929828 9443106 29.57
Clipping Object 25660773 7068664 27.55
Bounding Box 921869187 436347103 47.33
Light Buffer 11780860 6728420 57.11
Vista Buffer 2208478 2144762 97.11
Function VM calls: 88
Roots tested: 217585910 eliminated: 43232
Calls to Noise: 3544 Calls to DNoise: 36760
Shadow Ray Tests: 34071387 Succeeded: 8334916
Reflected Rays: 9021048 Total Internal: 17
Refracted Rays: 7998251
Transmitted Rays: 970
Radiosity samples calculated: 42010 (9.07 %)
Radiosity samples reused: 421288
Smallest Alloc: 18 bytes
Largest Alloc: 92896 bytes
Peak memory used: 8283571 bytes
Total Scene Processing Times
Parse Time: 0 hours 0 minutes 1 seconds (1 seconds)
Photon Time: 0 hours 0 minutes 0 seconds (0 seconds)
Render Time: 4 hours 7 minutes 38 seconds (14858 seconds)
Total Time: 4 hours 7 minutes 39 seconds (14859 seconds)
CPU time used: kernel 946.48 seconds, user 11311.77 seconds, total
12258.25 seconds
Render averaged 8.35 PPS over 102400 pixels
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#include "rad.inc" version 1.1-2006nov11. Radiosity is ON.
radiosity
{ brightness 1.000
count 200
error_bound 0.450
normal on
pretrace_end 0.01000
pretrace_start 0.080
recursion_limit 1
}
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Incredibly, POV-Ray seems to have been granted only 82% of the CPU. I
suspect that the remainder was dominated by my Web browser being kicked
around by ad requests and YouTube pulls. However, my Internet connection
is so capricious that I really hesitate to close any windows, especially
YouTube. (When it takes an hour to download a 4 minute video--and this
after several attempts spanning hours--you don't want to let it go.)
Normal is on because it defaults that way in my include file. I could
have sworn I'd changed it. In any case, I don't think it make much, if
any, difference for this scene. Radiosity notwithstanding, I suspect that
the real slowdown was in the sphere_sweep:
Spiral form with radiosity 12258 seconds (3:24:18)
Spiral form without radiosity 736 seconds (0:12:16)
Dummy shape with radiosity 82 seconds
Dummy shape without radiosity 6.25 seconds
Ratios of spiral to dummy were 150:1 and 118:1.
Ratios of radiosity to non were 17:1 and 13:1.
That it took 12 minutes *without* radiosity should have been a tip-off.
Another slowdown may have been in my attempt at limb-darkening, which
involved refraction and a near-duplication of the tubing. While the
real-life effect far exceeds the dynamic range of the typical CG image, it
is noticeable enough in real life that a saturated CG render looks flat
and unnatural. (I didn't do a controlled timing test of that feature
because of the trouble it would take to dismantle it; I may do it later.)
The second attachment is welder's-eye view mock-up (the lighting is all
staged) of the effect that I'm trying to achieve.
--
<Insert witty .sig here>
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Attachments:
Download 'compact_fluo-swept.jpg' (13 KB)
Download 'compact_fluo-look.jpg' (7 KB)
Preview of image 'compact_fluo-swept.jpg'
Preview of image 'compact_fluo-look.jpg'
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