[Sigia-l] QTVR

[Joe 10 Enterprises]

FW(little)IW, they are not truly 3D models, they're a grid of 
overlapping bit-maps (which explains their file size) and a 
sophisticated, mouse click-hold-and-drag driven swapping mechanism.

/Joe

At 3:39 PM -0400 7/10/02, Scott Paterson wrote:
>Just a qwik comment about QTVR.
>
>QTVR provides the ability to make object movies as well as panoramas. Object
>movies provide all the criteria Christopher is describing regarding the
>ability of the user to manipulate their perspective. Object movies, as the
>term sounds, are 3D models exported as .mov files. The interface is similar
>to the panoramas in that the user clicks and drags and I think zooming is
>possible. One big problem with object movies is file size. They're big
>suckers. I made a super simple example(150x150px @ 1.8MB) for you here:
>www.ramplab.com/proj/cube.mov
>
>[sgp]
>
>.
>----- Original Message -----
>From: "Christopher Fahey [askrom]" <askROM at graphpaper.com>
>To: <Sigia-l at asis.org>
>Cc: "'Listera'" <listera at rcn.com>
>Sent: Wednesday, July 10, 2002 2:57 PM
>Subject: RE: [Sigia-l] 3-D workflows
>
>
>>  Ziya wrote:
>>  > Do you consider QTVR 3D?
>>
>>  I don't consider it a 3-dimensional dataset. QTVR is just a 2d image
>>  with fancy scroll mechanisms and fancy distortion algorithms meant to
>>  imitate a 3D perspective, but the data is still a "bitmap" of pixels
>>  with X and Y (no Z) coordinates (ignoring for now the color dimension).
>>
>>  > How about a globe that revolves on its own axis in front of
>>  > you while you stay stationary?
>>
>>  If the globe has relief mountains sticking out of it, and/or if the user
>>  can directly control the rotation along the X, Y, and Z axes, then yes.
>>  If it's just a rotating video loop, then no. The question is this: Is
>>  the globe a 2D map projected onto a sphere, or is it a 3D dataset like a
>>  CAD model.
>>
>>  > Is the ability of the viewer to move physically and/or
>>  > virtually in a given
>>  > space relative to a specific object the sole differentiator?
>>
>>  Yes, with a caveat: the user does not need to move their body, they
>>  simply need to be able to move their *perspective* on the dataset.
>>  Causing a 3D model of a tree to rotate is sematically the same as
>>  walking around the tree. The differentiator, then, is the ability to
>>  change perspective on the dataset.
>>
>>  2D images can be entirely grasped by just looking and not ever moving
>>  the perspective. A QTVR image can convey the same information even if it
>>  were just a still image of a panorama - if you think about it, the QTVR
>>  technology actually inhibits the user's ability to view all the
>>  information in the dataset! If one was able to (like the scene in blade
>>  runner) look *behind* the objects depicted in a QTVR image, then it
>>  might qualify as a 3D dataset.
>>
>>  The viewer must be able to move and rotate their perspective in more
>>  than 2 dimensions: X, Y, and Z. I'm not trying to set up some kind of
>>  strict rule system about what is 3D and what is not - both of your
>>  examples are clearly intended to blur the distinction between 2D and 3D
>>  datasets, and hence to trip me up! I think we can agree that there is a
>>  significant qualitative difference between an isometric projection of a
>>  building that you can only look at and a scale model of a building that
>>  you can stick your head into and peek around the corners.
>>
>>  -Cf
>>
>>  [christopher eli fahey]
>>  art: http://www.graphpaper.com
>>  sci: http://www.askrom.com
>>  biz: http://www.behaviordesign.com
>>
>>
>>
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>
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