Retrieving the amount of vertices/edges/faces in a QMesh (QT6)

[Spazz]

Hi,

I'm having trouble to count the cells (vertices/edges/faces) of a QMesh, using Qt3DRender in QT6.

Goal : given a Qt3DRender::QMesh, retrieve its amount of vertices, edges and faces.

Example : For a simple cube, I'd like to retrieve 8/12/6

It seems that the vertexCount method of the Qt3DRender::QGeometryRenderer class function is designed for this.

From the documentation, a Qt3DRender::QMesh is a Qt3DRender::QGeometryRenderer so I decided to use vertexCount. Here comes the problem => it always returns 0.

Context when calling vertexCount :

• The loading state of the QMesh on which I'm calling vertexCount is Qt3DRender::QMesh::Ready

• I tried to parse the vertices positions of the Qt3DCore::QGeometry associated to the QMesh to count its vertices => it works (that is, the geometry is loaded too)

Questions :

• What is a "primitive" in the Qt3DRender::QGeometryRenderer terminology? The function vertexCount definition is "holds the primitive count". I assumed that a "primitive" is either a vertex, an edge or a face (since this is what theQt3DRender::QGeometryRenderer::PrimitiveType enumeration is).

• Is there any example using this function? I found nothing on the Internet nor in the Qt examples bank.

Thanks for your help !

[safylee]

@Spazz have you solved the problem? It seems tha I met the same trouble that the vertexCount is alway 0.