How can i get the list of geometry of a shape

[Daoudou]

Hello

I want to know how can i get the osg::Geometry of a shape ?? like osg::Cone for example.

Thanks
SOUFFOU

[robertosfield]

The osg::Shape implementations don't have a osg::Geometry so you can "get" one from it. The osg::Shape are just primitive shape definitions that don't have any additional functionality built-in.

In order to be render a shape you need to use a osg::ShapeDrawable, but this isn't what you asked, perhaps what you meant. Look at the osgshape example.

[Daoudou]

Hello
thanks for you're answer.

I want to use the project osgModeling with osg::ShapeDrawable but i need osg::Geometry for that, i start with TriangleFunctor for duplicate the facets of a cone to do a Boolean Operator with a Box but i have this result :

my code :

osg::ref_ptr<osg::Geometry> createConeDirtyWay() {

osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array(arrayVecCone.size());

for (unsigned int i = 0; i < arrayVecCone.size(); i++)
{
    (*vertices)[i].set(arrayVecCone.at(i));
}

geom->setVertexArray(vertices.get());
geom->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLES, 0, arrayVecCone.size()));

return geom;
}

osg::ref_ptr<osg::Geometry> createCubeDirtyWay() {

osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array(arrayVecCube.size());


for (unsigned int i = 0; i < arrayVecCube.size(); i++)
{
    (*vertices)[i].set(arrayVecCube.at(i));
}

geom->setVertexArray(vertices.get());
geom->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLES, 0, arrayVecCube.size()));

return geom;
}

// i use vector array to get every Vec3 of facets of Box and Cone

`struct FaceCollectorCone
{
void operator()(const osg::Vec3& v1, const osg::Vec3& v2,
const osg::Vec3& v3, bool)
{
arrayVecCone.push_back(v1);
arrayVecCone.push_back(v2);
arrayVecCone.push_back(v3);
}
};

struct FaceCollectorCube
{
void operator()(const osg::Vec3& v1, const osg::Vec3& v2,
const osg::Vec3& v3, bool)
{
arrayVecCube.push_back(v1);
arrayVecCube.push_back(v2);
arrayVecCube.push_back(v3);
}
};

// in the main fonction :
osg::ref_ptrosg::Cone coneModel = new osg::Cone(osg::Vec3f(0.,0.,0.),5,15);
osg::ref_ptrosg::ShapeDrawable shapeCone = new osg::ShapeDrawable;

shapeCone->setShape(coneModel);

osg::TriangleFunctor functor;
shapeCone->accept(functor);

osg::ref_ptrosg::Box cubeModel = new osg::Box(osg::Vec3f(0., 0., 9.), 5);
osg::ref_ptrosg::ShapeDrawable shapeCube = new osg::ShapeDrawable;

shapeCube->setShape(cubeModel);

osg::TriangleFunctor functorCube;
shapeCube->accept(functorCube);`

it's look like the Cone have too much Vec3 in my vector array.

[robertosfield]

I am not familiar with the osgModelling library so can't help with this.

Looking at osg::ShapeDrawable in the OSG-3.6 branch, it subclasses from osg::Geometry so you should be able to just query it directly for it's vertex and primitive data.