Thanks Carsten,
So, if I understand correctly for stereo when using a MatrixCamera we have to
generate projection & modelview matrices ourselves (every frame if it's an
asymmetric, off-axis frustum like those found in ProjectionViewport)?
Regarding the larger issue here, I did some deeper digging into what might be
happening with the perspective camera and I noticed that the matrix I feed
OpenSG isn't the same as what I receive back through: Camera->getViewing().
It's not even the inverse, which I was expecting. I'm currently feeding
"getViewing()" a matrix to fill, and the pixel width/height from the current
viewport. Is this the proper method to use for this? Here's some sample output
showing the in/outs.
-------
ref = matrix generated by my navigator and fed directly to OSG
inv = the inverted version of "ref", never submitted to OSG
osg = the matrix I receive from OSG using "getViewing()"
ref: 0.559012 0.353901 0.749840 -1.327405
0.000000 0.904337 -0.426819 1.448839
-0.829159 0.238597 0.505536 -0.178932
0.000000 0.000000 0.000000 1.000000
inv: 0.559012 0.000000 -0.829159 0.593673
0.353901 0.904337 0.238597 -0.797777
0.749840 -0.426819 0.505536 1.704189
0.000000 0.000000 0.000000 1.000000
osg: 0.559012 0.353901 0.749840 -0.000000
0.000000 0.904337 -0.426819 0.000000
-0.829159 0.238597 0.505536 -0.000000
0.593673 -0.797777 1.704189 1.000000
-------
What is even weirder about this is that the REF rotational values transfer
over, but the positional values are the same as the inverted matrix. My matrix
math is beyond "rusty" but can anyone explain what could potentially cause
this? I'm at a loss.
Thanks
E.
---
Eric Maslowski
Research Computer Specialist
University of Michigan 3D Lab
email: [EMAIL PROTECTED]
-----Original Message-----
From: Carsten Neumann [mailto:[EMAIL PROTECTED]
Sent: Friday, November 21, 2008 12:36
To: [email protected]
Subject: Re: [Opensg-users] Occlusion Culling & Flickering Objects
Hello Eric,
Maslowski, Eric wrote:
> Hello all,
> Looks like I have to deal with this issue of odd frustums again and it
> appears that others might be having similar problems. (recent: disappearing
> object thread) So, as a first step I wanted to switch over to MatrixCameras
> so that I have direct control over the modelview and projection matrices.
> Unfortunately, when I replace my PerspectiveCamera with MatrixCamera, I get a
> runtime error every frame:
>
> FATAL: ShearedStereoCameraDecorator::getProjection: can only decorate
> PerspectiveCameras!
>
> Has something changed in the core? In the documentation for 1.8 under
> "Windows and Viewports / Decorators" it says that:
>
> "In our example you could exchange a perspective camera with a matrix camera
> and the stereo setup won't be destroyed"
I'm sorry that is an error in the documentation, I just did a cvs
annotate on the source and that check (and message) is in there since 2002.
The matrix camera gives you full control, but at the price of the system
not really knowing what is going on (e.g. it is not even clear that you
do a perspective projection, could be orthographic).
Sorry,
Carsten
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