Hi,
I want  to draw  a  cylinder which could be stretched in one direction, such as 
z-axis positive direction. In other word, the height of  cylinder would be 
longer with the time.  Using the callback function and matrix to scale, the 
result is unexpected, and the cylinder is scale in two direction, z-axis 
positive and negative  direction.
Could anyone give me some advice?

... 

Thank you!

Cheers,
Jason

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http://forum.openscenegraph.org/viewtopic.php?p=42356#42356





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