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I appear to have hit a transparent blob bug.
I initially though the bug was related to task 53, which it is noted is
fixed in the latest beta but the scene I trying to render will still not
render a specific part of the scene given reasonable time, i.e. 18 hours
just for one specific square (bucket?), when in MacMegaPov 1.2.1 the
whole scene renders in 8 hours. Using non transparent spheres in the
blob it renders in seconds in either version.
The scene is rather large, well for me, with over 5000 spheres
contributing to the blob so I know its not ideal for debugging other
than the 'start it off in, a debugger and wait a day and see where its
at and them start debugging' style.
I'm currently rendering it again, in order to locate the spot it stops
again and seeing if a partial render of that area with allow for a
quicker run to the point it stops.
The system specs are...
2.0Ghz CoreDuo 2Gb iMac, running OSX 10.6.2
The version of POV-ray I'm running is the Yvo's 3.7.0.beta.35 Universal
build for Mac OS 10.5 or later.
Persistence of Vision(tm) Ray Tracer Version 3.7.0.beta.35
Compiler: gcc 4.2.1 (Apple Inc. build 5646) (dot 1)
This is an unofficial version compiled by:
The scene can be downloaded from
http://planetgenesis.sf.net/blob_bug.zip and is 133kb
The ini file saved from the beta is....
Antialias_Depth=3
Antialias=On
Antialias_Threshold=0.3
Bits_Per_Color=8
Bounding=On
Bounding_Threshold=10
Continue_Trace=On
Create_Ini="/Users/vargol/Source/Releases/StructureSynth-v1.0.0/output.ini"
Display=On
End_Column=1000
End_Row=1000
Height=1000
Input_File_Name="/Users/vargol/Source/Releases/StructureSynth-v1.0.0/output.pov"
Jitter_Amount=1
Jitter=On
Library_Path="/Users/vargol/Source/Releases/StructureSynth-v1.0.0/"
Library_Path="/Users/vargol/Apps/POV-Ray 3.6/include/"
Output_Alpha=On
Output_File_Name="/Users/vargol/Source/Releases/StructureSynth-v1.0.0/output.png"
Output_File_Type=n
Output_To_File=On
Quality=9
Remove_Bounds=On
Render_Block_Size=32
Sampling_Method=2
Split_Unions=On
Start_Column=1
Start_Row=1
Version=3.6
Width=1000
Work_Threads=2
Dave
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David Burnett wrote:
> I appear to have hit a transparent blob bug.
>
I've looked into this a little bit more...
I rendered the full scene as a 10 x 10 image and got the following
statistics. The obvious issue is that in the beta Max Level is 1/5
compared to 5/5 for MMP. Is the bug http://bugs.povray.org/task/53
really fixed or have I hot a similar bug ?
MacMegaPov
Scene Statistics
Finite objects: 1
Infinite objects: 1
Light sources: 3
Total: 5
Render Statistics
Image Resolution 10 x 10
----------------------------------------------------------------------------
Pixels: 100 Samples: 1898 Smpls/Pxl: 18.98
Rays: 1665597 Saved: 0 Max Level: 5/5
----------------------------------------------------------------------------
Ray->Shape Intersection Tests Succeeded Percentage
----------------------------------------------------------------------------
Blob 2661332 1610028 60.50
Blob Component 106136840 39954543 37.64
Blob Bound 790006766 254708868 32.24
Plane 2661332 580312 21.81
----------------------------------------------------------------------------
Roots tested: 2644412 eliminated: 964181
Calls to Noise: 1868607 Calls to DNoise: 1868617
----------------------------------------------------------------------------
Shadow Ray Tests: 4343884 Succeeded: 1358385
Transmitted Rays: 1663699
----------------------------------------------------------------------------
Smallest Alloc: 20 bytes
Largest Alloc: 600496 bytes
Peak memory used: 7904254 bytes
Total Scene Processing Times
Parse Time: 0 hours 0 minutes 0 seconds (0 seconds)
Photon Time: 0 hours 0 minutes 0 seconds (0 seconds)
Cloth Time: 0 hours 0 minutes 0 seconds (0 seconds)
Mechsim Time: 0 hours 0 minutes 0 seconds (0 seconds)
Render Time: 0 hours 1 minutes 15 seconds (75 seconds)
Postpr. Time: 0 hours 0 minutes 0 seconds (0 seconds)
Total Time: 0 hours 1 minutes 15 seconds (75 seconds)
3.7.0.beta.35
----------------------------------------------------------------------------
Parser Statistics
----------------------------------------------------------------------------
Finite Objects: 1
Infinite Objects: 1
Light Sources: 3
Total: 5
-----------------------------------------------------------------------------------------------------------------------------
Render Options
Quality: 9
Bounding boxes.......On Bounding threshold: 10
Antialiasing.........On (Method 2, Threshold 0.300, Depth 3, Jitter
1.00)
----------
Render Statistics
Image Resolution 10 x 10
----------------------------------------------------------------------------
Pixels: 121 Samples: 757 Smpls/Pxl: 6.26
Rays: 51319216 Saved: 3833664 Max Level: 1/5
----------------------------------------------------------------------------
Ray->Shape Intersection Tests Succeeded Percentage
----------------------------------------------------------------------------
Blob 116511167 61770583 53.02
Blob Component 5529425260 1394028228 25.21
Blob Bound 41648703980 13122426436 31.51
Plane 190663483 48890011 25.64
----------------------------------------------------------------------------
Roots tested: 124197493 eliminated: 53757710
Shadow Ray Tests: 143177931 Succeeded: 52063455
Shadow Cache Hits: 1403792
Transmitted Rays: 51318338
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Render Time:
Photon Time: No photons
Radiosity Time: No radiosity
Trace Time: 0 hours 54 minutes 40 seconds (3280.049 seconds)
using 2 thread(s) with 0.-02 CPU-seconds total
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> David Burnett wrote:
>> I appear to have hit a transparent blob bug.
This is more of a performance issue...
it's unrelated to ticket #53.
It renders in a reasonable time with 3.6,
so there definitely is something else wrong somewhere
in the 3.7 blob code.
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Tim Attwood a écrit :
>> David Burnett wrote:
>>> I appear to have hit a transparent blob bug.
>
> This is more of a performance issue...
> it's unrelated to ticket #53.
>
> It renders in a reasonable time with 3.6,
> so there definitely is something else wrong somewhere
> in the 3.7 blob code.
Having looked deeply at the 3.7 blob code, during #53, and compared it
to 3.6... the code are nearly identical, IIRC.
But it might be related to the calling code, which was/still doing a
fancy (IMHO) tweaking when counting the depth of a ray.
(see trace.cpp, circa line 192)
--
Real software engineers work from 9 to 5, because that is<br/>
the way the job is described in the formal spec. Working<br/>
late would feel like using an undocumented external procedure.
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