[openvrml-develop] getting coordinates from ViewPoint- and Sound-Nodes

[-oli- <ol...@fr...>]

Hi, all!

To integrate OpenAL in OpenVMRL (see my former mails) I need answers to the 
following issues.
Btw - I'm using the "normal" cvs-version (not the rearchitecture-branch).

(1) How can I get the coordinates of the actual ViewPoint, i.e. including 
the user navigation transformations, in the VRML-world coordinate system 
(_not_ the OpenGL coordinate system)?
I have found some code concerning this in VrmlScene.render(). But how can I 
get the position out of the modelview-matrices used here? After a 
MV.getTransform(pos,...) the values in pos don't change even if I turn the 
scene around the viewer (or the viewer around the scene, which probably is 
more correctly). I also need some information (e.g. view-up-vector) about 
the ViewPoint's orientation.

(2) How can I get the coordinates of a Sound node in the VRML-world 
coordinate system?
It seems to have something to do with the rc.getMatrix() method, but how do 
I get the position out of the matrix? Can I multiply the matrix with the 
position field of the Sound node?

Thanks for answers,
hints are welcome!

	-oli-
	(Oliver Baum)