Using setCamera[XY]Rotation in Q3DScatterWidgetItem to move camera above a point

gmbrown

I'm building a 3D scatter graph for a magnetometer calibration tool. The graph is centered on [0,0,0], I'd like to make sure the camera points through the most recent point (call it v) to [0,0,0].
I'm struggling finding the right incantation. I'm not really sure how CameraXRotation and CameraYRotation should relate to the euler angles of v. Here's my latest effort (which doesn't work):

   QVector3D v = QVector3D(x,y,z);
    v.normalize();

    // camera vector
   
    QVector3D camera = QVector3D(0,1,0);  // camera along y axis

    // compute rotation

    QQuaternion rotation = QQuaternion::rotationTo(camera,v);
    rotation.getEulerAngles(&pitch,&yaw,&roll);

    // set camera rotation
    
    graph->setCameraXRotation(roll);
    graph->setCameraYRotation(pitch);

gmbrown

After much digging to understand how qtgraphs handles vectors, I did finally crack this. Camera direction is -z, coordinates are y-up. So X rotation angle is from yaw.

QVector3D v = QVector3D(x,y,z);
v.normalize();

// camera vector

QVector3D camera = QVector3D(0,0,-1);  // camera along z axis

// compute rotation

QQuaternion rotation = QQuaternion::rotationTo(camera,v);
rotation.getEulerAngles(&pitch,&yaw,&roll);

// set camera rotation

graph->setCameraXRotation(yaw);
graph->setCameraYRotation(pitch);