Hi all,
What is the reason that setScale is not supported in perspective
projection ? I would like to set the distance eye point - image plate
(which defines also the projection) e. g. with View . set FieldOfView.
And then I would like to scale the whole scene with View.setScale which
does not work. Or does it work only in certain Window eyepoint policies
? There is no documentation in the API about that.
I know that I could use a TransformGroup with a scaling transformation
as root of the scene graph. But what if I want to do that only for a
single View ?
regards
Paul
PS: Why do I want to do that ?
This email from Kevin Rushfort helped me to solve my question about the
focus plane in stereoscopic images (just asked a few days ago on this
list). The focus plane is the image plate !
***************************************************************
Paul,
The image plate is not the same thing as the front clipping plane. The
image plate is the plane of the screen, also used as the projection
plane. The front clipping plane can be specified relative to either
the eye point or the screen (image plate) and is typically in front of
the image plate (closer to the eye), but it could be specified right at
the image plate if you wanted to. If the front clipping plane is
specified relative to physical eye, and you want the front clipping
plane in world coordinates, you could get the eye point in image plate
coordinates, subtract the front clipping distance from the z value of
the eye point, and translate that to vworld using the inverse of
getVworldToImagePlate.
Hope this helps.
****************************************************************
Thanks Kevin ! It answered also different question.
Since the image plate (=focus plane) defines which part of the scene
seems to pop out of the screen and which part of the scene seems to be
behind the screen I want to change the position of the image plate in
the scene. This can be done either with moving the Viewplatform or by
setting the eye point - image plate distance. But there are situations
where the objects are just too big to be on the screen ads whole with a
specific position of the image plate. The break of the depth cue isvery
disturbing in this case. So if I could simply choose a different scale
for the scene I could shrink (or grow) the objects to a good size for
viewing.
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