I want to build an app which should have one camera (or two identical, meaning
that they are at the same position, facing the same direction, if that is more
convenient) and multiple screens. The screens will be aligned in a 90 degree
angle towards each other. So they are perpendicular:
top view:
Code:
| <- 1
| 2
| |
| v
|________
O
Where O is the eye or camera. It's like looking at a box with holes in all
sides and you want to see the inside. And the screens on which I want to
project are the sides of the box.
It's a bit like the PcubeE, but then with only two screens:
http://hct.ece.ubc.ca/research/pcubee/ and
http://www.youtube.com/watch?v=2iV0Icy41JM
I've been messing with ViewMatrix, ViewProjectionMatrix, frustums etc. but I
cannot get the result I want. I've looked at dozens of examples (like
3rdperson, windows, sidebyside, compositeviewer, etc.) but I do not really get
the idea how to set this up, quite lost in all the possibilities at the moment.
In the PcubeE paper
(http://hct.ece.ubc.ca/publications/pdf/stavness-lam-fels-CHI2010.pdf) they say:
To generate perspective-corrected images on each screen of pCubee, we use a
standard off-axis projection scheme as described by Deering [9]. This is done
in OSG by creating three View objects that correspond to the three visible
screens on pCubee. The camera for each View is located at the user’s
eye-position (which I will set manually at like right in the middle of the two
screens, so at 45 degrees), oriented perpendicular to its corresponding virtual
screen, and given a view frustum that passes through the corners of its virtual
screen.
Setting the near-clip plane coincident with the screen plane prevents rendering
of virtual objects in front of the screens, which would cause occlusion issues
at the screen edges. Synchronization between screens is handled within OSG: the
separate Views are contained within a single CompositeViewer object and the
camera parameters in each View are updated before a single call is made to
CompositeViewer to update all the Views simultaneously.
Well my question is: how do you do that in code. I'm sorry, I just started
programming for OSG so I'm a noob :(.
[/i]
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http://forum.openscenegraph.org/viewtopic.php?p=34800#34800
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