[osg-users] Creating a Tree with recursive algo + osg:Geometry

[Benoît Bayol]

Hi all :)

I am actually building an application which builds tree or any kind of  
plants.


So for a tree we have the trunk and branches which are composed by  
little elements that we called metamers. Each metamers are linked with  
others.


My first shot with OSG was to create a recursive algorithm that  
created a geode with a geometry at each metamers with the good  
osg::MatrixTransform for calculating position. But it was too slow at  
rendering because of culling, indeed I had about 3000 geodes with a  
geometry into each of them.


So I have decided to build the whole plant as a geometry and add it to  
a simple geode. So now only one geode and one geometry.


My question is how I can sum the geometry easily ?

osg::ref_ptrosg::Geometry Metamer::Build(Base  myBase)
{
osg::ref_ptrosg::Geometry myInternode = this-in.Build(myBase);
this-geometry-setVertexArray(myInternode-getVertexArray());
this-geometry-addPrimitiveSet(myInternode-getPrimitiveSet(0));

myBase.applyDeviationAngle(60);

if (this-GetLateralMetamer(0) != NULL)
{
osg::ref_ptrosg::Geometry lateralMetamer = this- 
GetLateralMetamer(0)-Build(myBase);

//HERE IS THERE ANYWAY TO ADD OSG::GEOMETRY TOGETHER ?
this-geometry-setVertexArray(lateralMetamer-getVertexArray());
this-geometry-addPrimitiveSet(lateralMetamer- 
getPrimitiveSet(0));

}


return this-geometry;
}

Thank you for helping :)___
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Re: [osg-users] Creating a Tree with recursive algo + osg:Geometry

[Robert Osfield]

Hi Benoit,

There is a merge geometry operation embedded in src/osgUtil/Optimizer.cpp.

Robert.

On Mon, Dec 15, 2008 at 10:28 AM, Benoît Bayol benoit.ba...@gmail.com wrote:
 Hi all :)
 I am actually building an application which builds tree or any kind of
 plants.
 So for a tree we have the trunk and branches which are composed by little
 elements that we called metamers. Each metamers are linked with others.
 My first shot with OSG was to create a recursive algorithm that created a
 geode with a geometry at each metamers with the good osg::MatrixTransform
 for calculating position. But it was too slow at rendering because of
 culling, indeed I had about 3000 geodes with a geometry into each of them.
 So I have decided to build the whole plant as a geometry and add it to a
 simple geode. So now only one geode and one geometry.
 My question is how I can sum the geometry easily ?
 osg::ref_ptrosg::Geometry Metamer::Build(Base  myBase)
 {
 osg::ref_ptrosg::Geometry myInternode = this-in.Build(myBase);
 this-geometry-setVertexArray(myInternode-getVertexArray());
 this-geometry-addPrimitiveSet(myInternode-getPrimitiveSet(0));



 myBase.applyDeviationAngle(60);



 if (this-GetLateralMetamer(0) != NULL)
 {
 osg::ref_ptrosg::Geometry lateralMetamer =
 this-GetLateralMetamer(0)-Build(myBase);
 //HERE IS THERE ANYWAY TO ADD OSG::GEOMETRY TOGETHER ?
 this-geometry-setVertexArray(lateralMetamer-getVertexArray());
 this-geometry-addPrimitiveSet(lateralMetamer-getPrimitiveSet(0));
 }



 return this-geometry;
 }
 Thank you for helping :)
 ___
 osg-users mailing list
 osg-users@lists.openscenegraph.org
 http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org


___
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