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no### [at] nospam org news:41d4829c$1@news.povray.org
> Can anyone offer advice on making your own HDR probe using either
> POV-Ray or a digital camera? Thanks.
>
There was a nice tutorial while googling for HDRI, basicly the idea is to
take a mirror ball (regular ball of reflective silver metal or somthig) -
it will reflect 180 degrees around. Now take a photo of it. Then take photo
of the opposit side - and this images can be combined (using proper
software) into one full 360.
Also, You must take not one pair, but severl pairs of images with different
brightness settings - so that one image will show dark areas (while
everythng alse would be totaly white), other will show light areas (leaving
everything eldse almost pure-black), etc, their combined togeather create
dymaic range image.
--
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics
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Wasn't it Rafal 'Raf256' Maj who wrote:
>no### [at] nospamorg news:41d4829c$1@news.povray.org
>
>> Can anyone offer advice on making your own HDR probe using either
>> POV-Ray or a digital camera? Thanks.
>>
>
>There was a nice tutorial while googling for HDRI, basicly the idea is to
>take a mirror ball (regular ball of reflective silver metal or somthig) -
>it will reflect 180 degrees around. Now take a photo of it. Then take photo
>of the opposit side - and this images can be combined (using proper
>software) into one full 360.
>
>Also, You must take not one pair, but severl pairs of images with different
>brightness settings - so that one image will show dark areas (while
>everythng alse would be totaly white), other will show light areas (leaving
>everything eldse almost pure-black), etc, their combined togeather create
>dymaic range image.
There's such a tutorial on the HDRShop website. HDRShop is software that
you can use to combine the photos.
http://www.ict.usc.edu/graphics/HDRShop/
Alternatively, you can create HDR probes with MegaPOV. Look at the
"hdr_environment.pov" that is included with the MegaPOV distribution.
That produces a HDR environment in a format suitable for use by MEGAPov.
Some people use the term "probe" only to refer to a HDR environment
that's arranged as an angular map. If that's what you need, then you can
use HDRShop to perform a "Panoramic Transformation".
You can't do in one step it with official POV-Ray because POV can't
output files in that format. I suppose you could output several images
with different brightness in official POV_Ray and stitch them together
with HDRShop in a manner similar to .
--
Mike Williams
Gentleman of Leisure
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