Qt Quick 3D - Dynamic Texture Example

Demonstrates how to use a 2D layer as a 3D texture.

This example shows how to use 2D content from Qt Quick and use it as a texture for 3D objects. The 2D item used in this example is a fancy corkboard and it is textured onto a simple double door.

The 2D scene

The 2D content we use for this example is the CorkBoard scene from Qt Quick's Touch Interaction Example. We put it in a Rectangle and show it on top of our View3D.

 Rectangle {
     id: object2d
     width: 500
     height: 700
     anchors.top: parent.top
     anchors.left: parent.left
     anchors.margins: 10

     CorkBoards { }

     clip: true
     layer.enabled: true
 }

We give the 2D object the name object2d, so we can refer to it later.

The 3D view

To use the 2D content in our 3D scene, we first have to put it into a material. The texture is identified by the sourceItem property, referring back to object2d.

 DefaultMaterial {
     id: doorMaterial
     diffuseMap: Texture {
         sourceItem: object2d
     }
 }

We use the same material for each door, but different meshes. The meshes are designed so that the texture is divided evenly across the doors. In addition to setting the material and the source mesh, we also set the pickable property, so we can click on the doors to open and close them:

 Model {
     id: door1
     ...
     source: "meshes/door1.mesh"
     materials: doorMaterial
     pickable: true

Finally, we add some interaction to our 3D scene, using View3D.pick:

 TapHandler {
     onTapped: {
         var result = view.pick(point.position.x, point.position.y);
         if (result.objectHit) {
             console.log("pick dist", result.distance, "hit", result.objectHit,
                         "scene pos", result.scenePosition, "uv", result.uvPosition);
             var pickedDoor = result.objectHit;
             if (pickedDoor.state === "")
                 pickedDoor.state = "opened";
             else
                 pickedDoor.state = "";

         }
     }
 }

Each door will open when clicked and its state is set to "opened".

 states: State {
     name: "opened"
     PropertyChanges {
         target: door1
         eulerRotation.y: 90
     }
 }
 transitions: Transition {
     to: "opened"
     reversible: true
     SequentialAnimation {
         PropertyAnimation { property: "eulerRotation.y"; duration: 2000 }
     }
 }

Files:

Images:

Contents

Qt Quick 3D - Dynamic Texture Example

The 2D scene

The 3D view