How can I add a mesh to a specific position in the scene using three.js?
I attempted the following code without success:
// mesh refers to an instance of THREE.Mesh
// scene is an instance of THREE.Scene
scene.add(mesh)
scene.updateMatrixWorld(true)
mesh.matrixWorld.setPosition(new THREE.Vector3(100, 100, 100))
scene.updateMatrix()
However, there was no change in the result. Any suggestions on what I should do next?
I suggest checking out the documentation at this link: http://threejs.org/docs/#Reference/Objects/Mesh At the top of the documentation page, you will see that Mesh inherits from "Object3D". This means you can utilize all methods and properties provided by Object3D. Click on the "Object3D" link on the documentation page to view the list of properties. Among them is the property ".position". By clicking on ".position", you can determine that its data type is Vector3.
Now, try implementing the following:
// Assuming 'scene' represents an instance of THREE.Scene
scene.add(mesh);
mesh.position.set(100, 100, 100);
I came across this code snippet on a GitHub repository earlier, specifically related to three.js version r71.
mesh.position.set(100, 100, 100);
This method can also be applied for individual axis adjustments:
mesh.position.setX(200);
mesh.position.setZ(200);
For more information, you can refer to the official documentation here:
Here is a detailed explanation of how it works:
Since mesh.position is an instance of "Vector3", Vector3() provides setX(), setY(), and setZ() methods which allow for easy manipulation of object positions.
mesh.position = new THREE.Vector3(); // Here we create a new Vector3 for position
vector1 = new THREE.Vector3();
mesh.position.setX(100); // This sets the x-coordinate to 100
vector1.setX(100); // Same as above since both are Vector3 objects
camera1.position.setZ(100); // You can also adjust other coordinates similarly
light1.position.setY(100); // This method is applicable to any object's position
In my coding practice, I typically utilize the Vector3 method to establish object positions.
let group = new THREE.Group();
// position of box
let vector = new THREE.Vector3(10, 20, 30);
// add wooden Box
let woodenBox = new THREE.Mesh(boxGeometry, woodMaterial);
//update postion
woodenBox.position.copy(vector);
// add to scene
group.add(woodenBox)
this.scene.add(group);
If you're searching for a way to update the position from Vector3
const V3 = new THREE.Vector3(0,0,0) // Initialize variable at zero position
const box = new THREE.Mesh(geometry, material) // Create an object
Object.assign(box.position, V3) // Set the object's position to zero
OR
const V3 = new THREE.Vector3(0,0,0) // Initialize variable at zero position
const box = new THREE.Mesh(geometry, material) // Create an object
box.position.copy(V3)
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