Moving Camera on a moving frame of the scene

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Guenter Schreiber (Guenter.Schreiber++at++dlr.de)
Tue, 26 Jan 1999 17:40:33 +0100

Hi pfAll,

I am using Performer to visualize Robot worlds, and now I'm having the
problem
to simulate a handcamera of a robot. I know, which frame of the robot is
the moving
one, which is a tree of some pfDCS'es. So, I'd like to find out the
exact
position of the moving frame in Basecoordinates.
How can I do that.
I tried the Callback functions with pfTraverser. But I found out, that
the respective Callback function has not been called too often - even
the robot moved.
So a jumping camera resulted.
Is there another possibility to inquire the resulting Transformation of
some successive
pfDCSes, like in Inventor with a SoMatrixAction ?

And- by the way, what is the difference between
pfGetModelMat
pfGetViewMat
pfGetProjMat
-- more exact, where's the documentation, which transformation is which.
From where starts pfGetModelMat?
I assume at the first Node of my scene, and it goes until my Node.
If the node is a Transformation, is it included ?

Has anybody dealt with this problem? Any clues ?

Bye for now, and thanks in advance

Günter Schreiber

-- 
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 ______________________________________________________________
| Dipl.-Ing. Günter Schreiber | phone: *49/*8153/28/1183       |
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|    System Dynamics          |  Guenter.Schreiber++at++dlr.de       
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