SimpleCamera.qml Example File

multiviewport/SimpleCamera.qml
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 import Qt3D.Core 2.0
 import Qt3D.Render 2.0

 Entity {
     id: root

     property vector3d position: Qt.vector3d(0.0, 0.0, 10.0)
     property vector3d viewCenter: Qt.vector3d(0.0, 0.0, 0.0)
     property vector3d upVector: Qt.vector3d(0.0, 1.0, 0.0)
     property CameraLens lens: null

     components: [lens, transform]

     Transform {
         id: transform
         matrix: {
             var m = Qt.matrix4x4();
             m.translate(root.position)
             var zAxis = root.position.minus(root.viewCenter).normalized()
             var xAxis = root.upVector.crossProduct(zAxis).normalized();
             var yAxis = zAxis.crossProduct(xAxis);
             var r = Qt.matrix4x4(xAxis.x, yAxis.x, zAxis.x, 0,
                                  xAxis.y, yAxis.y, zAxis.y, 0,
                                  xAxis.z, yAxis.z, zAxis.z, 0,
                                  0, 0, 0, 1)
             return m.times(r);
         }
     }
 }