[Radiance-general] Pixel to solid angle transformation

[Marija Velickovic]

Hi Lars,

You are right the math behind is what interests me.
I know that it depends on projection. For the moment I'm interested in
angular fisheye view used for evalglare input images. I thought that is
gives equal solid angle for every pixel, but it seems that angles vary
slightly (increasing towards image corners), and that's what is puzzling me.

Marija

On Thursday, February 14, 2013, Lars O. Grobe wrote:

> Hi,
>
> I think Marja wanted to know the math behind, not the tools available to
> query a pixel's solid angle. Unfortunately, the calculation depends on the
> projection, and there are several projections included in Radiance now. One
> simplification may be to reproject anything to e.g. an equisolid fisheye,
> where the solid angles of all pixels should be equal and could be
> calculated as the solid angle of the image divided by the amount of pixels.
>
> Cheers, Lars.
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