Hi Peter,
I think you question is really about overriding virtual methods in
C++, but I'm not sure.
If call geometry->clone() and the geometry object is an instance of
PiFaceGeometry then the clone method called will be
PiFaceGeometry::clone() even if the geometry pointer you have is of
the parent class osg::Geometry. i.e.
PiFaceGeometry* myFaceGeometry = new PiFaceGeometry;
Geometry* geometry = myFaceGeometry;
geometry->clone(); // will call PiFaceGeometry::clone().
Robert.
On 30 November 2011 12:18, Peter Bako <bakopet...@gmail.com> wrote:
> Hello guys!
> I have run a search over the topics, but I didn't find an answer for my
> question, so here it is:
>
> I have my own derived class called PiFaceGeometry, which is derived from
> osg::Geometry class, I use this to work with faces of solids - so I have the
> type of face - cylinder, plane, and other which I store within this class and
> also some other properties.
> I have a different class called SolidComponent, which is derived from
> osg::MatrixTransform and represent machinery workpieces and tools.
>
> The problem is that sometimes I need to clone the SolidComponent (which
> contains Geode as child with PiFaceGeometries, and can also contain other
> SolidComponents as children). I think, I need a deep copy, because sometimes
> I have to change the color of triangles, or am I wrong? The question is, how
> should I reimplement the clone() function? I looked also into the osg source
> code but I didn't understand the way, how to do this.
>
> How can I force the program to call PiFaceGeometry::clone() if this is only a
> child of object, on which I called clone()?
> I am sorry If this question is silly, I am not a good C++ programmer and I
> hate C++ :-P.
>
> Thank you for your responses!
>
> Cheers,
> Peter
> Code:
>
> class PiFaceGeometry: public osg::Geometry {
> public:
> osg::ref_ptr<osg::IntArray> edges;
> PiSurfaceType surfType;
> void changeFaceColor(osg::Vec4 color){...};
> PiFaceGeometry * clone(const osg::CopyOp ©op ){
> //how can I reuse Geometry::Clone(), if it returns a Geometry but I need
> PiFaceGeometry?
> }
> };
>
>
>
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=44132#44132
>
>
>
>
>
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