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+ import QtQuick
+ import QtQuick3D
+
+ Item {
+ id: root
+ width: 640
+ height: 480
+ visible: true
+
+ property bool swapped: false
+
+ property string skyFragmentShaderCode: `
+ void MAIN()
+ {
+ vec3 d = normalize(qt_eyeDir);
+ FRAGCOLOR = vec4(d * 0.5 + 0.5, 1.0);
+ }
+ `
+
+ // The sky materials deliberately live outside the 3D scene, mimicking
+ // materials provided by e.g. a QML singleton. Their only scene manager
+ // reference comes from the SceneEnvironment.skyMaterial assignment, so
+ // every swap destroys the backend node of the outgoing material and
+ // recreates it when it is assigned again.
+ SkyMaterial {
+ id: skyMaterialA
+ skyboxMode: SkyMaterial.Cubemap
+ enableIBL: true
+ radianceMapSize: 256
+ fragmentShaderCode: root.skyFragmentShaderCode
+ }
+
+ SkyMaterial {
+ id: skyMaterialB
+ skyboxMode: SkyMaterial.Cubemap
+ enableIBL: true
+ radianceMapSize: 256
+ fragmentShaderCode: root.skyFragmentShaderCode
+ }
+
+ View3D {
+ anchors.fill: parent
+
+ environment: SceneEnvironment {
+ backgroundMode: SceneEnvironment.SkyMaterial
+ skyMaterial: root.swapped ? skyMaterialB : skyMaterialA
+ }
+
+ PerspectiveCamera {
+ z: 300
+ }
+
+ DirectionalLight {
+ }
+
+ Model {
+ source: "#Cube"
+ materials: PrincipledMaterial { baseColor: "white" }
+ }
+ }
+ }