Thanks for pointing me in the right direction Andreas. I had tried
your suggestion yesterday an only gotten core dumps. But since you
said it's the way to do it, I dug a little deeper. I was setting up a
MatrixCamera as in the 18opengl_slave example. To get rid of my core
dumps I had to add a beacon to the camera:
NodePtr beacon = Node::create();
mBeaconCore = Transform::create();
beginEditCP(beacon);
beacon->setCore(mBeaconCore);
endEditCP(beacon);
beginEditCP(mMatrixCamera);
mMatrixCamera->setBeacon(beacon);
endEditCP(mMatrixCamera);
And to make OSGInvViewMatrix update, I had to update it myself when I
updated my camera:
// retrieve OpenGL's matrices
Real32 proj_matrix[16], model_matrix[16];
glGetFloatv(GL_PROJECTION_MATRIX, proj_matrix);
glGetFloatv(GL_MODELVIEW_MATRIX, model_matrix);
Matrix proj, model;
proj.setValue(proj_matrix);
model.setValue(model_matrix);
// use OpenGL matrices in OpenSG camera
beginEditCP(mMatrixCamera);
mMatrixCamera->setProjectionMatrix(proj);
mMatrixCamera->setModelviewMatrix(model);
endEditCP(mMatrixCamera);
beginEditCP(mBeaconCore);
mBeaconCore->setMatrix(model);
endEditCP(mBeaconCore);
So, I'm not really getting OSGInvViewMatrix for free this way. It
would be easier to pass it to the shader program myself. I know there
are other methods for setting up cameras that I haven't tried yet.
Would another camera setup be more appropriate for me?
- Terry
> Message: 2
> Date: Sat, 23 Apr 2005 14:18:35 +0200
> From: Andreas Zieringer <[EMAIL PROTECTED]>
> To: [email protected]
> Subject: Re: [Opensg-users] activating OSGInvViewMatrix
> Reply-To: [email protected]
>
> Hi Terry,
>
> you just have to add the parameter to the SHLChunk that's all.
>
> Andreas
>
> shl->setUniformParameter("OSGInvViewMatrix ", Matrix());
>
> > I have used SHLChunk's OSGInvViewMatrix in vred with great results.
> > However, I can't seem to get it working in my own program. The matrix
> > appears to be all zeroes in my shader. Is there something I have to
> > do to activate OSGInvViewMatrix and all those other built-in uniforms?
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