Can't load data.. (about QQuick3DGeometry)

doomdi

Hi all

CAN'T LOAD DATA!!!!

make Custom Geometry for real time c++ data to qml
But data not show...

Here is my code.

in main.qml

View3D {
        anchors.fill: parent
        camera: camera

        PerspectiveCamera {
            id: camera
            position: Qt.vector3d(0, 200, 300)
        }

        Model {
            geometry: Pointcloud {
                name: "test"
//                count: 1440
            }
            materials: PrincipledMaterial {}
            scale: Qt.vector3d(1, 1, 1)
        }

        AxisHelper {
            enableXYGrid: true
            enableXZGrid: true
            enableYZGrid: true
            enableAxisLines: true
        }

        WasdController {
            controlledObject: camera
        }
    }

in pointcloud_test.cpp

void pointcloud_test::updateGeometry()
{
    clear();

    QByteArray vertexData;
    vertexData.resize((/*real data*/).size() * 3);
    vertexData.clear();
//    float *p = reinterpret_cast<float *>(vertexData.data());
//    float *dump = p;

    for (int i = 0; i < (/*real data*/).size(); i++) {
        QVector3D vertex;
        vertex.setX(/*some float data*/);
        vertex.setY(/*some float data*/);
        vertex.setZ(/*some float data*/);
//        qDebug() << vertex;
        vertexData.append(vertex.x());
        vertexData.append(vertex.y());
        vertexData.append(vertex.z());
//        *p++ = vertex.x();
//        *p++ = vertex.y();
//        *p++ = vertex.z();
    }

    setVertexData(vertexData);
    setPrimitiveType(QQuick3DGeometry::PrimitiveType::Points);
    setStride(3);
    addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0, QQuick3DGeometry::Attribute::F32Type);
//    qDebug() << vertexData;
//    p = dump;
//    free(p);
}

I refered to this.

oria66

Hi, @doomdi. This works for me. https://github.com/oria66/test-qml-3dquickpc.

Hope you find your answer.

Still:

I can not change the size of the points.
I can not change the color individually.

Kind regards

doomdi

Hi @oria66.

Unfortunately, I'm still stuck..

u said

I can not change the size of the points.
I can not change the color individually.

point size maybe... in your git's code

in main.qml
give scale

Model {
            geometry: CustomGeometry{
                name: "mypointcloud"
                count: 10000000
            }
            materials: PrincipledMaterial{
                baseColor: "white"
                metalness: 0
                roughness: 0
                specularAmount: 0
                indexOfRefraction: 0
                specularTint: 0.0
                opacity: 1.0
                emissiveColor: "white"
            }
            scale: Qt.vector3d(10,10,10)
        }

color individually... I think it's impossible in a model.
how about make many model in a view3D?

oria66

@doomdi Hi. If you manipulate the scale, you scale the model, but the points maintain the same size.

doomdi

Hi @oria66 ..

That's..

So, when real time c++ data load to qml... (it must be renderred to 3D)
what is the best ?

I have 1 more question.

I tried clear() in my pointcloud_test.cpp
it's not update data... what is it?

doomdi

Hi All.

I solved this problem.
just remove clear() and add update() in pointcloud_test.cpp