QObjectPicker - QPickingSettings::TrianglePicking doesn't work with custom mesh

JulianM

Hi,

I have a custom mesh witch is implemented trough QGeometry -> QGeometryRenderer. In general is a plane from triangles that could be edited.
My problem is that QObjectPicker doesn't catch the clicking/selections on this plane. Event are not triggered at all.
I configured QRenderSettings to Qt3DRender::QPickingSettings::TrianglePicking.
Even when I put AllPicks and FrontAndBackFace still nothing.

I little mo info for may custom mesh. Here how I configured the Attributes

_VertexDataBuffer = new Qt3DRender::QBuffer(Qt3DRender::QBuffer::VertexBuffer, this);
_IndexDataBuffer = new Qt3DRender::QBuffer(Qt3DRender::QBuffer::IndexBuffer, this);


// Attributes
_PositionAttribute = new Qt3DRender::QAttribute();
_PositionAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
_PositionAttribute->setBuffer(_VertexDataBuffer);
_PositionAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
_PositionAttribute->setVertexSize(3);
_PositionAttribute->setByteOffset(0);
_PositionAttribute->setByteStride(9 * sizeof(float));
_PositionAttribute->setCount(_Grid_W * 2);
_PositionAttribute->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());

_NormalAttribute = new Qt3DRender::QAttribute();
_NormalAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
_NormalAttribute->setBuffer(_VertexDataBuffer);
_NormalAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
_NormalAttribute->setVertexSize(3);
_NormalAttribute->setByteOffset(3 * sizeof(float));
_NormalAttribute->setByteStride(9 * sizeof(float));
_NormalAttribute->setCount(_Grid_W * 2);
_NormalAttribute->setName(Qt3DRender::QAttribute::defaultNormalAttributeName());

_ColorAttribute = new Qt3DRender::QAttribute();
_ColorAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
_ColorAttribute->setBuffer(_VertexDataBuffer);
_ColorAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
_ColorAttribute->setVertexSize(3);
_ColorAttribute->setByteOffset(6 * sizeof(float));
_ColorAttribute->setByteStride(9 * sizeof(float));
_ColorAttribute->setCount(_Grid_W * 2);
_ColorAttribute->setName(Qt3DRender::QAttribute::defaultColorAttributeName());

_IndexAttribute = new Qt3DRender::QAttribute();
_IndexAttribute->setAttributeType(Qt3DRender::QAttribute::IndexAttribute);
_IndexAttribute->setBuffer(_IndexDataBuffer);
_IndexAttribute->setVertexBaseType(Qt3DRender::QAttribute::UnsignedShort);
_IndexAttribute->setVertexSize(1);
_IndexAttribute->setByteOffset(0);
_IndexAttribute->setByteStride(0);
_IndexAttribute->setCount(_Grid_W * 2 * 3);

Can you help me and tell me what I have to do in order to make this mesh to work normally with QObjectPicker ?
Thanks.

P.S. As you can see I am using c++ not QML

JulianM

Never mind the problem was in my code - /I was not counting correctly the vertices :-)/ Everything works as expected .

VictorT

hi there, JulianM
Could you explain a little bitmore, how the vertex count affect the picking? and what was the problem exactly(how it was solved)?