POV-Ray : Newsgroups : povray.binaries.images : Experiments with light probes : Re: Experiments with light probes Server Time
9 May 2024 07:46:24 EDT (-0400)
  Re: Experiments with light probes  
From: Bill Pragnell
Date: 2 Jun 2009 04:30:01
Message: <web.4a24e1f375b7d3c96dd25f0b0@news.povray.org>
"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> -Use HDR shop to make sure the images are aligned perfectly.  Open all of one
> series, maiximize the windows, then centre all images (5 on the keypad).  You
> can then flick back and forth between each pic and use the
> "Image/Transform/Shift w/wrap" function in HDR shop to align each one, using
> one as a starting reference.  Even one pixel shift can help if necessary.

Do you mean the bracketed series before combination? There's no problem here,
the HDRs I'm getting are very sharp.

> -Try to match resolutions with your two combined HDRs and the masking image.
> Scale smoothly.  I always scale up to the largest.

Yup, am doing. I scale down to the smaller one, but it's usually only different
by a dozen pixels or so. I make the mask by painting on a layer over the
rotated image to wipe out the unwanted areas, then clearing the lower layer to
black, merging and blurring.

> - I use the mask provided and scale it accordingly

I never thought of that. However, my shadow can be anywhere, and my tripod head
gets in the way quite a bit.

> - After youve successfully created your full HDR probe, it is still in
> mirrorball, transform to Lat/Long.  I like to keep the height the same as the
> mirrorball resolutions and the width double that (eg 500x500 mirroball ->
> 1000x500 Lat/Long)

Hmm, I've been unwrapping to angular and rotating at the same time, as per the
tutorial. Do you think keeping it in the mirrorball projection would be better
for matching and blending? Or do you really mean angular ;-) ?

I'm using megapov, so I figured using the angular map would be fine for the time
being. I'll probably supply both projections when I get a collection going.

> Maybe post some details of your difficulties, or if you'd like you can email
> me directly.

I'll try post an example of the problem later today... it's slight, but enough
of a mismatch to be annoying. If it's an interior environment, straight lines
of walls/windows etc end up broken. Maybe I'm too much of a perfectionist!

Bill


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