- On Tue, 03 May 2011 12:36:33 +0900, Ken Warner <kwarner000@...>

wrote:

> Roger, you are exactly right. Cylindrical images need a cylindrical

Yes, and there's a fairly easy (though not universally applicable) way

> projection. Most viewers use a gnomic projection assuming that the

> image they are projecting is a spherical image. A cylindrical image

> projected gnomically will have verticals that converge toward the poles.

>

> If DevalVR does handle cylindrical projections correctly, that would be a

> very good thing for architectural scenes.

of differentiating between cylindrical and spherical projections. If

the image has a width that is exactly double the height, then it is

usually safe to assume "spherical" and if not, well, not.

Roger W.

--

Work: www.adex-japan.com - Hi Roger,

Yes, DevalVR works as you wrote, if the proportion is aproximately 2:1 the projection used is "spherical", if not it uses "cylindrical", this is true in 99% of cases. Maybe the stitching program could add an EXIF code to solve this ambiguity in the JPEG, I don't know.

Anyway, I added the projection options in the context menu of the player since one year ago, so projection can be changed easily.

regards!

fiero

--- In PanoToolsNG@yahoogroups.com, "Roger D. Williams" <roger@...> wrote:

>

> On Tue, 03 May 2011 12:36:33 +0900, Ken Warner <kwarner000@...>

> wrote:

>

> > Roger, you are exactly right. Cylindrical images need a cylindrical

> > projection. Most viewers use a gnomic projection assuming that the

> > image they are projecting is a spherical image. A cylindrical image

> > projected gnomically will have verticals that converge toward the poles.

> >

> > If DevalVR does handle cylindrical projections correctly, that would be a

> > very good thing for architectural scenes.

>

> Yes, and there's a fairly easy (though not universally applicable) way

> of differentiating between cylindrical and spherical projections. If

> the image has a width that is exactly double the height, then it is

> usually safe to assume "spherical" and if not, well, not.

>

> Roger W.

>

> --

> Work: www.adex-japan.com

>