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Playing a bit with the saving and loading radiosity data option in
MegaPov, to get rid of the blue images when using a blue sky_sphere.
Blue_blue_rad.jpg shows the standard situation, radiosity with a blue
sky_sphere.
Blue_wh_rad.jpg, here the radiosity data are used of a rendering with
a white sky. In the final there is of course the blue one.
Blue_red_rad.jpg, now with the radiosity data of a red sky.
Blue_wh_nc_rad.jpg, white radiosity data, but in the final all object
colours are removed.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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Attachments:
Download 'Blue_blue_rad.jpg' (10 KB)
Download 'Blue_wh_rad.jpg' (11 KB)
Download 'Blue_red_rad.jpg' (11 KB)
Download 'Blue_wh_nc_rad.jpg' (10 KB)
Preview of image 'Blue_blue_rad.jpg'
Preview of image 'Blue_wh_rad.jpg'
Preview of image 'Blue_red_rad.jpg'
Preview of image 'Blue_wh_nc_rad.jpg'
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ingo <ing### [at] home nl> wrote:
> Playing a bit with the saving and loading radiosity data option in
> MegaPov, to get rid of the blue images when using a blue sky_sphere.
> Blue_blue_rad.jpg shows the standard situation, radiosity with a blue
> sky_sphere.
> Blue_wh_rad.jpg, here the radiosity data are used of a rendering with
> a white sky. In the final there is of course the blue one.
> Blue_red_rad.jpg, now with the radiosity data of a red sky.
> Blue_wh_nc_rad.jpg, white radiosity data, but in the final all object
> colours are removed.
Interesting, especially the last one. You can see just how much yellow the
the rearmost ellipsoid picks up from the forward one, and how much blue the
main ellipsoid picks up from the ground, as compared to the sky. On the
whole, the differences are fairly subtle, but placing the pics next to each
other really helps.
I'd be interested in seeing the no object colors for the other skies.
Geoff
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in <3aed7c1a@news.povray.org> Geoff Wedig wrote:
> I'd be interested in seeing the no object colors for the other skies.
>
As requested.
Removing objects is also fun.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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Attachments:
Download 'No_obj_rad.jpg' (12 KB)
Download 'Blue_red_nc_rad.jpg' (10 KB)
Download 'Blue_blue_nc_rad.jpg' (10 KB)
Preview of image 'No_obj_rad.jpg'
Preview of image 'Blue_red_nc_rad.jpg'
Preview of image 'Blue_blue_nc_rad.jpg'
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ingo wrote:
>
> Playing a bit with the saving and loading radiosity data option in
> MegaPov, to get rid of the blue images when using a blue sky_sphere.
> Blue_blue_rad.jpg shows the standard situation, radiosity with a blue
> sky_sphere.
> Blue_wh_rad.jpg, here the radiosity data are used of a rendering with
> a white sky. In the final there is of course the blue one.
> Blue_red_rad.jpg, now with the radiosity data of a red sky.
> Blue_wh_nc_rad.jpg, white radiosity data, but in the final all object
> colours are removed.
>
That looks interesting, have you also tried changing the light sources?
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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Christoph Hormann <chr### [at] gmxde> wrote:
> ingo wrote:
>>
>> Playing a bit with the saving and loading radiosity data option in
>> MegaPov, to get rid of the blue images when using a blue sky_sphere.
>> Blue_blue_rad.jpg shows the standard situation, radiosity with a blue
>> sky_sphere.
>> Blue_wh_rad.jpg, here the radiosity data are used of a rendering with
>> a white sky. In the final there is of course the blue one.
>> Blue_red_rad.jpg, now with the radiosity data of a red sky.
>> Blue_wh_nc_rad.jpg, white radiosity data, but in the final all object
>> colours are removed.
>>
> That looks interesting, have you also tried changing the light sources?
Yeah. Maybe try it with no light sources at all, and ambient set to 0.
That would give a good idea exactly how much radiosity is doing in different
cases.
Geoff
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in <3AEEB0B4.9AF46A99@gmx.de> Christoph Hormann wrote:
> That looks interesting, have you also tried changing the light
> sources?
>
Not yet, as it currently takes two renderings per image. It would be
nice if the whole process could be automated within POV-Ray. Do the
pretrace, save data, flip the value of a switch/constant, parse the
scene again and render with the gathered radiosity data.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
Post a reply to this message
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in <3aeef957@news.povray.org> Geoff Wedig wrote:
> Yeah. Maybe try it with no light sources at all, and ambient set
> to 0. That would give a good idea exactly how much radiosity is
> doing in different cases.
>
Is this what you mean. Radiosity data gathering passage, one white
light_source and a sky:
pigment {gradient y color_map {[0, rgb 0.6] [1, rgb 1]}}
Rendering passage no light, no sky.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
Post a reply to this message
Attachments:
Download 'rad.jpg' (9 KB)
Preview of image 'rad.jpg'
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ingo <ing### [at] homenl> wrote:
> in <3aeef957@news.povray.org> Geoff Wedig wrote:
>> Yeah. Maybe try it with no light sources at all, and ambient set
>> to 0. That would give a good idea exactly how much radiosity is
>> doing in different cases.
>>
> Is this what you mean. Radiosity data gathering passage, one white
> light_source and a sky:
> pigment {gradient y color_map {[0, rgb 0.6] [1, rgb 1]}}
> Rendering passage no light, no sky.
Exactly. However, I didn't realize that radiosity makes standard lighting
irrelevant, which it obviously does, or the objects wouldn't be so bright.
I thought it was just an 'extra' light that was added when the color was
determined.
So I learned something from the pic, at least. ;)
Geoff
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ingo <ing### [at] homenl> wrote:
> in <3AEEB0B4.9AF46A99@gmx.de> Christoph Hormann wrote:
>> That looks interesting, have you also tried changing the light
>> sources?
>>
> Not yet, as it currently takes two renderings per image. It would be
> nice if the whole process could be automated within POV-Ray. Do the
> pretrace, save data, flip the value of a switch/constant, parse the
> scene again and render with the gathered radiosity data.
Should be pretty easy using the clock variable. Just animate a sequence of
two shots, and #if the variables that change.
Geoff
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On 1 May 2001 16:54:14 -0400, ing### [at] homenl (ingo) wrote:
>Not yet, as it currently takes two renderings per image. It would be
>nice if the whole process could be automated within POV-Ray. Do the
>pretrace, save data, flip the value of a switch/constant, parse the
>scene again and render with the gathered radiosity data.
You could do that with the Pre_Scene_Command and Post_Scene_Command
INI file options.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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