POV-Ray: Newsgroups: povray.general: HDR problem

POV-Ray : Newsgroups : povray.general : HDR problem		Server Time 5 Nov 2024 18:24:25 EST (-0500)

From: Maurice
Subject: HDR problem
Date: 30 Dec 2004 13:04:29
Message: <41d4432d$2@news.povray.org>

Hi,

I've started experimenting with HDR in MegaPov 1.1
I set out modifying the hdr_mapping.pov demofile in scenes\megapov\hdr 
to render the kitchen_probe.

I moved the camera a bit : location <4,4,-8>
and of course I'm using map_type 7

The resulting image was somewhat unexpected. (Image binary is posted in 
p.b.images. It seems that the probe is not correctly mapped onto the sphere.

What am I doing wrong?

-- 
Maurice

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From: Christoph Hormann
Subject: Re: HDR problem
Date: 30 Dec 2004 13:30:01
Message: <cr1h9m$pju$1@chho.imagico.de>

Maurice wrote:
> Hi,
> 
> I've started experimenting with HDR in MegaPov 1.1
> I set out modifying the hdr_mapping.pov demofile in scenes\megapov\hdr 
> to render the kitchen_probe.
> 
> I moved the camera a bit : location <4,4,-8>
> and of course I'm using map_type 7
> 
> The resulting image was somewhat unexpected. (Image binary is posted in 
> p.b.images. It seems that the probe is not correctly mapped onto the 
> sphere.
> 
> What am I doing wrong?

What you see is a limitation of the map_type 7 - the distortion of the 
projection increases with the distance from the center.  Either rotate 
the map to have another area in view or use a differetly projected HDR 
map.  Note in most cases you will not want to have the HDR map in direct 
view anyway (unless it is very high resolution).

Christoph

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