Hi Lennart,
On Wed, 2005-05-18 at 18:37 +0200, Lennart Kulf wrote:
> Hi.
>
> I am trying to use a 3d object as a 3d interaction device. My scenegraph
> is devided into two subtrees; one for the model of the device, the other
> subtree stores the actual scene.
...
>
> I create a transformation matrix of this kind: M=A*T*B (A shall be
> executed first...)
Note that OpenSG (like OpenGL) uses the v'=M*v convention, i.e. the
rightmost matrix is applied first.
> But I wonder if there is any way to do this in a different way, using
> OpenSG features I did not yet discovered.
Not that I can see it. There are no higher-level coordinate systems
functions (and I'm not sure what they would be in the first place ;).
> And is the HitPoint of a IntersectAction given as an absolute value or
> as a local value? Is there a nice way to get global coordinates for the
> HitPoint, if it is given as a local value?
The HitPoint is in the coordinate system of the line used for
intersection, which in general is the global coordinate system.
HIH
Dirk
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