Dynamically determine the position of an object within a three.js scene

Question

Dynamically determine the position of an object within a three.js scene

Hello, I am a beginner exploring the world of threejs.

Currently, I have a scene set up with an object that can be freely moved along the XYZ Axis using TransformControls.js.

My goal is to retrieve the updated X,Y,Z position coordinates of this specific object within the scene whenever it is translated or moved by clicking and dragging on any axis (X,Y,Z).

Prior to rendering the scene, I typically use mesh.position.set( 0, 0, 0 ); to establish the initial position of the object. However, I am struggling to figure out how to obtain the dynamic position of the object as it moves within the scene.

Ultimately, my objective is to save the modified position coordinates after each transformation operation, allowing me to re-render the scene with the object positioned at the updated coordinates when the user returns to the page or initiates a page refresh.

If anyone has any suggestions or guidance on how to achieve this, I would greatly appreciate it.

Thank you for your help!

javascript three.js

Answer 1

Answer №1

Utilizing THREE.TransformControls

involves a series of steps.

Instantiate your THREE.TransformControls object
Integrate it into your scene
Attach it to the desired object for manipulation

var transControl = new THREE.TransformControls(camera, renderer.domElement);
scene.add(transControl);
// assuming you add "myObject" to your scene...
transControl.attach(myObject);
// and then later...
transControl.detatch();

Connecting the control to an object will introduce a manipulation "gizmo" in the scene. Dragging different parts of the gizmo will execute various transformations. Upon completing the transformation using the gizmo, inspecting mesh.position should reveal the updated position.

Further details for clarity:

The object's position will not be altered until you utilize the "gizmo" to move it. For example:

Your object is located at (10, 10, 10) within the scene
transControl.attach(yourObject)
The "gizmo" emerges at (10, 10, 10)
Your object remains at (10, 10, 10)
Employ the "gizmo" to translate the object in the +Y direction
Your object will now have an updated position

console.log(yourObject.position.y > 10); // true

Answer 2

Utilizing THREE.TransformControls

involves a series of steps.

Instantiate your THREE.TransformControls object
Integrate it into your scene
Attach it to the desired object for manipulation

var transControl = new THREE.TransformControls(camera, renderer.domElement);
scene.add(transControl);
// assuming you add "myObject" to your scene...
transControl.attach(myObject);
// and then later...
transControl.detatch();

Connecting the control to an object will introduce a manipulation "gizmo" in the scene. Dragging different parts of the gizmo will execute various transformations. Upon completing the transformation using the gizmo, inspecting mesh.position should reveal the updated position.

Further details for clarity:

The object's position will not be altered until you utilize the "gizmo" to move it. For example:

Your object is located at (10, 10, 10) within the scene
transControl.attach(yourObject)
The "gizmo" emerges at (10, 10, 10)
Your object remains at (10, 10, 10)
Employ the "gizmo" to translate the object in the +Y direction
Your object will now have an updated position

console.log(yourObject.position.y > 10); // true

Answer 3

Answer №2

It's possible that I'm a bit late to the party, but there's a way to retrieve the most recent value by leveraging the 'objectChange' event in TransformControls.

Take a look at this sample code snippet:

const transformControls = new TransformControls(camera, renderer.domElement);

transformControls.addEventListener('objectChange', (e) => {
  console.log(e.target.object.position.x);
})

Answer 4

It's possible that I'm a bit late to the party, but there's a way to retrieve the most recent value by leveraging the 'objectChange' event in TransformControls.

Take a look at this sample code snippet:

const transformControls = new TransformControls(camera, renderer.domElement);

transformControls.addEventListener('objectChange', (e) => {
  console.log(e.target.object.position.x);
})

Answer 5

Answer №3

The initial response is inaccurate, the correct code snippet should read as follows:

const transformControls = new TransformControls(camera, renderer.domElement);

transformControls.addEventListener('objectChange', (e) => {
  console.log(e.target.object.position.x);
})

Answer 6

The initial response is inaccurate, the correct code snippet should read as follows:

const transformControls = new TransformControls(camera, renderer.domElement);

transformControls.addEventListener('objectChange', (e) => {
  console.log(e.target.object.position.x);
})

Dynamically determine the position of an object within a three.js scene

Answer №1

Answer №2

Answer №3

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