The PDF does a good job of explaining how it works.

I was looking for the equation relating angular position to distance from the center of the projection.

-Chas

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Hi Chas,

Can you please explain how the "planospheric" fisheye projecting

differs from the "-vta" angular fisheye project with "-vh 180"?

Hmm, I thought I'd done that in the PDF. Typically, all fisheye

projections are used with a -vh and -vv of 180. The difference is the

projection of the hemisphere onto a flat surface. Let me know where

the PDF needs some more clarifications.

Axel

Wikipedia, dude. That's what I used...

http://en.wikipedia.org/wiki/Stereographic_projection

-Greg

## ···

From: Charles Ehrlich <[email protected]>

Date: March 18, 2008 8:13:55 PM PDT

The PDF does a good job of explaining how it works.

I was looking for the equation relating angular position to distance from the center of the projection.

# -Chas

Hi Chas,

> Can you please explain how the "planospheric" fisheye projecting

> differs from the "-vta" angular fisheye project with "-vh 180"?

Hmm, I thought I'd done that in the PDF. Typically, all fisheye

projections are used with a -vh and -vv of 180. The difference is the

projection of the hemisphere onto a flat surface. Let me know where

the PDF needs some more clarifications.

Axel