POV-Ray : Newsgroups : povray.binaries.images : Photon problems? : Re: Photon problems? Server Time
15 Aug 2024 08:19:58 EDT (-0400)
  Re: Photon problems?  
From: earthdog
Date: 10 Jul 2002 11:47:46
Message: <3D2C5729.3050209@NOSPAMevil3d.net>
earthdog wrote:
> TinCanMan wrote:
> 
>>> I've posted the source for the scene in povray.text.scene-files.  I
>>> wouldn't think the scene is scaled abnormally.  The sphere is one
>>> pov-unit in radius.  The camera is location<-7,6,-4>.  I'm stumped.
>>>
>>> -- Jeff
>>>
>>
>>
>> Yeah I see that now.  I think it is as ingo said.  The light source is 
>> too
>> close to the object.  The resulting photons get spread out too much to 
>> cover
>> the entire object. In order to get smoother results at this distance you
>> need to play with the various settings, either increase 'count' or 
>> deacrease
>> 'spacing' (use only one of the two as they mutually exclusive, only 
>> one is
>> used if both are specified), also try increasing 'radius'.
>>
>> -tgq
>>
>>
> 
> Thanks for the help.  As I told Ingo, I used his suggestions and got rid 
> of any 'count' reference and decreased my spacing and added a glass 
> cylinder.  I may have gone overboard with 'spacing 0.001'.  I took about 
> 6 minutes to open up this reply window while pov sorts ~18,000,000 
> photons -- not to mention other open apps on my desktops.  So far, the 
> results look good, using the just released 3.5 final.  Seems very 
> stable.  I think if there were a memory leak in the linux version, I'd 
> have found it :).
> 

Done Tracing
Statistics for ball.pov, Resolution 320 x 240
----------------------------------------------------------------------------
Pixels:           77120   Samples:           92472   Smpls/Pxl: 1.20
Rays:          97612642   Saved:          19447212   Max Level: 25/25
----------------------------------------------------------------------------
Ray->Shape Intersection          Tests       Succeeded  Percentage
----------------------------------------------------------------------------
Cone/Cylinder                 60967976        41877574     68.69
Plane                         78514450        57743972     73.55
Sphere                        54848089        34338253     62.61
Bounding Box                 156629782       121151998     77.35
Light Buffer                   1480185         1235915     83.50
Vista Buffer                    268009          216165     80.66
----------------------------------------------------------------------------
Calls to Noise:                  0   Calls to DNoise:             10
----------------------------------------------------------------------------
Shadow Ray Tests:           370062   Succeeded:               168376
Reflected Rays:           47503012   Total Internal:        10855157
Refracted Rays:           20684856
Transmitted Rays:         15962997
Number of photons shot:       13369305
Surface photons stored:       17603052
Priority queue insert:          640406
Priority queue remove:          106504
Gather function called:         120143
----------------------------------------------------------------------------
Smallest Alloc:                 10 bytes   Largest:           327688
Peak memory used:        352516132 bytes
----------------------------------------------------------------------------
Time For Parse:    0 hours  0 minutes   1.0 seconds (1 seconds)
Time For Photon:   0 hours 32 minutes  25.0 seconds (1945 seconds)
Time For Trace:    0 hours 22 minutes  54.0 seconds (1012 seconds)
     Total Time:    0 hours 49 minutes  18.0 seconds (2958 seconds)


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