[Radiance-general] Mapping issue with HDR files generated from TIFF

[Greg Ward]

Are both your images square (same number of X and Y pixels)?  Radiance has a somewhat peculiar way of handling rectangular images, which could cause scaling discrepancies.  See p. 259 of "Rendering with Radiance" for details.

Cheers,
-Greg


> From: Mostapha Sadeghipour <sadeghipour at gmail.com>
> Subject: [Radiance-general] Mapping issue with HDR files generated from TIFF
> Date: August 22, 2014 8:58:38 PM GMT+02:00
> 
> Hello Radiance community,
> 
> I'm doing a series of experiments for using a 3rd party 3D software (in this case Rhino) to generate the map and render them with Radiance.
> 
> I made a workflow based on Giulio's suggestion (http://www.radiance-online.org/pipermail/radiance-general/2005-July/002851.html), and it works fine when I use Radiance example .hdr files, however when I use a custom pattern ( generated as a tiff image) and convert it to hdr (ra_tiff -r) it doesn't map correctly. Looks like hdr mapping is scaled.
> 
> Is there some consideration in generating the tiff file or converting it to hdr that I am missing. I tried to use pfilt and re-size the image to make sure the size is fixed but it didn't help.
> 
> Here is a slide that shows the problem:
> https://www.dropbox.com/s/eklns2rv5bv6tyj/RhinoVSRadiance.jpg?dl=0
> 
> Also the hdr file generated from tiff image in case it can help:
> https://www.dropbox.com/s/o293dqh04ack1hb/random_pattern_1.HDR?dl=0
> 
> Thanks in advance,
> Mostapha
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