[Three.js] Individually Manipulating Specific Objects Within a Group

Conclusion

• Just get the children and specify the index.

What I want to do

• I want to individually manipulate specific objects that have been grouped.
  • For example, within the group, I want to change the color or coordinates of only a specific object, etc.

Summary

let obj = new THREE.Group();
obj.add(mesh);
obj.add(mesh2);

// Get children
const children = obj.children;

// Get 3D objects within the group
const mesh = children[0];
const mesh2 = children[1];

// You can do things like changing the color of only a specific mesh
mesh.material.color=new THREE.Color("white");

Please have mesh and mesh2 ready.

How I researched it

I asked ChatGPT.

// Assuming you have already created the 'this.obj' group
// ...

// Access the children of the group
const children = this.obj.children;

// Assuming 'mesh' is the first child and 'mesh2' is the second child
const mesh = children[0];
const mesh2 = children[1];

// Modify the materials of mesh and mesh2 individually
const materialForMesh = mesh.material;
const materialForMesh2 = mesh2.material;

// Now you can manipulate the materials as you wish
materialForMesh.color.set("red"); // Change color for mesh
materialForMesh2.color.set("blue"); // Change color for mesh2

In this example, we access the children property of the this.obj group to get references to mesh and mesh2. Then, you can modify the materials of each mesh separately by accessing their material property and making changes to them, such as changing the color as demonstrated.

Remember to replace the index numbers (0 and 1) with the actual order of your objects in the group if they are in a different order.

Reference

https://ics.media/tutorial-three/object3d_group/