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To: [email protected]
Subject: Re: [Opensg-users] copy lines from a geometry
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[email protected] schrieb am 07.06.05 15:35:16:
Hi Dirk,
>Hi Andi,
>
>On Tue, 2005-06-07 at 15:08 +0200, Andreas Brüning wrote:
>
> i have a geometry with a lot of lines. There are only lines. I loaded
> it from a vrml- file. I want to copy the points of every line in a
> multimap, so in the end, there are two points in every entry of the
> multimap. How can i get the points of every line? Can i get them with
> the primitiv- Iterator?
>Yup, only the PrimitiveIterator will give you lines. You need to find
>the Geometry Node with those lines first (either looking for the name or
>walking the tree, see 10loading.cpp) and then run a PrimtiveIterator on
>it. You can start with the following snippet (after testIterators.cpp):
>
>PrimitiveIterator pi;
>
>for ( pi = g->beginPrimitives(); pi != g->endPrimitives(); ++pi )
>{
>std::cerr << "Primitive " << pi.getIndex() << ": "
><< Geometry::mapType( pi.getType() ) << " with "
><< pi.getLength() << " points" << std::endl;
>for ( j = 0; j < pi.getLength(); j++ )
>{
>std::cerr << "Point " << j << ": " << pi.getPositionIndex( j )
><< ": " << pi.getPosition( j );
>}
>}
>
>If you find primitives of type 1,2 or 3 (GL_LINES, GL_LINE_LOOP,
>GL_LINE_STRIP), those are lines. How to interpret the points and how to
>split it into 2-point lines depends on the type, see an OpenGL book for
>that.
>
>Hope it helps
>
>Dirk
thanks for your quick help.
It works, but there is only one point: pi.getPostion(j); for each entry. Where
i can find the other? If i put the j- Point and the j+1 point together, i see
only the half of the modell. With the snippet, i found out, that there is one
primitive with lines and nearly 15000 points. When i check the vrml-
Modell(which i load), there are 15000 lines. Where i can find the other half?
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