projection for equirectangular image RRS feed

  • Question

  • An equirectangular projection of a 360x180 panorama displays very well if only a small section is shown.  If the entire pano is shown, the equirectangular image is displayed.

    Many viewers will not have experience with equirectangular projections, and will find the zenith and nadir distorted beyond all recognition.  Could HDview give a pseudocylindrical or other projection mode for full spherical panos? 

    Perhaps a Quartic authalic projection or a Flat polar quartic projection as shown on http://www.progonos.com/furuti/MapProj/Normal/ProjPCyl/projPCyl.html would be best
    Thursday, August 9, 2007 9:32 PM

All replies

  • That's a good suggestion, we could try out other projections in a future release.  For now we only support the equirectangular when zoomed out.  The beta2 release does however allow you to control the amount of zoom-out possible.  See http://research.microsoft.com/ivm/HDView/HowDone/HDXMLspec.htm the maxFOV tag in the xml file.  This controls the maximum field of view allowed when viewing your pano.

    Saturday, August 11, 2007 4:32 PM
  • Thanks Matt,

    The maxFOV works, but is only an HFOV.  Note that when the HFOV is "maxed out" on the equator of a spherical pano, you can't change the pitch.  Alternatly, when viewing the vertex of a spherical pano, and maximizing the FOV, you can change the pitch to the equator and then maximize the FOV quite a bit further.

    A maximum vertical FOV would be nice.
    Wednesday, August 15, 2007 6:20 PM