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I have a strange problem with my IRTC entry when I turn on radiosity. This
was working OK so it seems to be something I have added to the image.
Problem is the image is nearly 12,000 lines of SDL and I have added a fair
bit since last generating the radiosity data. I am not really sure what has
been added since I last switched on radiosity. I am trying to eliminate
objects and the radiosity settings but have not yet found out what causes
it. Thought I would see if anyone has seen this problem before?
This happens with POV 3.6 and megapov 1.2
My Radiosity settings are
global_settings{
assumed_gamma 1.0
ambient_light 0.0
max_trace_level 15
#if (use_rad)
radiosity{
// save settings: modified Outdoor settings from rad_def.inc
#if (use_rad=2)
pretrace_start 0.08
pretrace_end 1/image_width
count 200
nearest_count 20
error_bound 0.1
recursion_limit 2
low_error_factor .9
gray_threshold 0
minimum_reuse 0.015
brightness 1
adc_bailout 0.01/2
normal on
save_file "oldtrain.rad"
#else
// load settings
pretrace_start 1 pretrace_end 1
load_file "oldtrain.rad"
error_bound 0.1 // it's important to specify the same value used to
save data
recursion_limit 2 // also the same if specified
always_sample off // no more samples: specially useful with focal blur
normal on
#end
}
#end
}
For megapov I used:
radiosity{
// save settings: modified Outdoor settings from rad_def.inc
#if (use_rad=2)
pretrace_start 1
pretrace_end PRETRACE_END //1/image_width
count 200
nearest_count 10
//error_bound 0.2
error_bound { 0.2 adaptive 2.0, 20 }
low_error_factor .8
gray_threshold 0
recursion_limit 2
brightness 0.8
adc_bailout 0.01/2
normal on
randomize on
save_file "oldtrain.rad"
#end
#if(use_rad=1)
// load settings
pretrace_start 1 pretrace_end 1
load_file "oldtrain.rad"
// error_bound 0.07 // it's important to specify the same value used
to save data
error_bound { 0.2 adaptive 2.0, 20 }
recursion_limit 2 // also the same if specified
always_sample off // no more samples: specially useful with focal blur
normal on
randomize on
#end
}
#end
}
If I use the default (low level) radiosity settings (when just inserting
radiosity from the menu I don't seem to get the problem.)
Also if I don't render all objects I don't seem to get the problem but I
have not yet found the culprit (either setting or object).
The image to the left has radiosity turned on the one to the right has it
turned off..
Help..
Sean
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Attachments:
Download 'radproblem.jpg' (43 KB)
Preview of image 'radproblem.jpg'
![radproblem.jpg](/povray.binaries.images/attachment/%3Cweb.44eecfde20d2d6465149fd40%40news.povray.org%3E/radproblem.jpg?ttop=443866&toff=4250&preview=1)
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OK, I think I have found the problem, I think it is the "normal on" in the
radiosity settings, the problem only seems to show up with fairly high
count values though and I think it is because some of my normals are set
very high. Never had this problem before but I am fairly sure it is to do
with this. I changed to using normals as I was using isosurfaces before but
the render times were too slow for this IRTC round deadline.
Sean
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"s.day" <s.d### [at] uel ac uk> wrote:
> OK, I think I have found the problem, I think it is the "normal on" in the
> radiosity settings, the problem only seems to show up with fairly high
> count values though and I think it is because some of my normals are set
> very high. Never had this problem before but I am fairly sure it is to do
> with this. I changed to using normals as I was using isosurfaces before but
> the render times were too slow for this IRTC round deadline.
>
> Sean
was experiencing same problem with an outdoor scene. Will try turning off
normal.
Thanks
Joanne
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From: Alain
Subject: Re: HELP!! Strange radiosity problem with my latest IRTC image..
Date: 28 Aug 2006 19:04:34
Message: <44f37682@news.povray.org>
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Joanne Simpson nous apporta ses lumieres en ce 27/08/2006 21:46:
> "s.day" <s.d### [at] uel ac uk> wrote:
>> OK, I think I have found the problem, I think it is the "normal on" in the
>> radiosity settings, the problem only seems to show up with fairly high
>> count values though and I think it is because some of my normals are set
>> very high. Never had this problem before but I am fairly sure it is to do
>> with this. I changed to using normals as I was using isosurfaces before but
>> the render times were too slow for this IRTC round deadline.
>>
>> Sean
>
> was experiencing same problem with an outdoor scene. Will try turning off
> normal.
> Thanks
> Joanne
>
Only set normal on if you REALY need to as it makes radiosity calculations a lot
more complex, resulting in greatly increased render times.
--
Alain
-------------------------------------------------
Don't waste your time on a man/woman, who isn't
willing to waste their time on you.
Post a reply to this message
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