Thank you for the information,
Is there any library or addon to opensg that supports the loading (and
triangulation) of CAD data such as the step, catia or IGES formats?
Yours georg.
-----Ursprüngliche Nachricht-----
Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Carsten Neumann
Gesendet: Mittwoch, 30. Januar 2008 20:47
An: [email protected]
Betreff: Re: [Opensg-users] Translating VRML object to center
Hello,
Wünsch wrote:
> HI Muhammad and all,
>
> If have a similar problem. It seems that some tools that generate vrml files
> save the vertex data with respect not to the local coordinate system of a
> Geometry but with respect to the world coordinate system.
in that case the local coordinate system should coincide with the world
coordinate system, otherwise something seems wrong. It is possible that
transformations are folded into the vertex data, but then they should also be
removed from the scene (otherwise they are applied twice).
Undoing this basically requires determining the transformation (the tricky
part, unless you are only interested in translation), applying its inverse to
the vertices and storing it in a transform node above the model.
> I guess one needs to somehow compute the "center of mass" or local geometric
> center of the vertices and then change the vertices such that they are stored
> with respect to that local center and additionally store the offset "world to
> local center" in the preceding Component Transformation.
>
> Is there a function to calculate the center of mass or the center of an array
> of Vertices? I guess one has to consider in the indices somehow in that
> algorith, too.
I don't think there is a function to compute the center of mass, but often the
center of the bounding volume gives a good approximation and is far easier to
compute ;) If you really want to do something like this you, I don't think you
need to look at the indices as you more interested in the "corners" of your
geometry, therefore it should not matter how many faces meet at one vertex.
Hope it helps,
Carsten
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