[osg-users] transforming between coordinate systems of two subgraph

[Christian Buchner]

Hi,

I was having some problems with a coordinate transformation.

root
matrixTransformA      matrixTransformB
subgraphA                subgraph B

I have two subgraphs in my scene, each of which is a child of a unique
MatrixTransform.

I now have to draw a line between an element from subgraph A to connect to
an element of subgraph B. I've decided to add this line into subgraphA as a
drawable - so both start and end point of this line have to be specified in
my "A" coordinate system.

How would I transform a coordinate from subgraph B coordinate system into
the equivalent
coordinate valid within subgraph A, ideally using utility functions
provided by the OSG framework ? I would like to do that with minimal amount
of code.

Excuse me for asking a basic linear algebra question, but I seem to be
stuck for good on this problem.

Christian
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