Exploring the Unchanging Object3D Characteristics of ThreeJS Version 68

Question

Exploring the Unchanging Object3D Characteristics of ThreeJS Version 68

According to the transition notes from r67 to r68, it is stated that:

Object3D's position, rotation, quaternion and scale properties are now immutable.

How does this impact practical implementation? I am seeking further clarification on this matter. I have not been able to locate an issue or pull request detailing this change.

Specifically, what modifications would need to be made to the following code snippets?

obj.position.x = 10;

Furthermore, how is this immutability maintained? Is there a specific point in time when the object becomes frozen, or are instances like Vector3 inherently immutable once they are constructed?

javascript three.js

Answer 1

Answer №1

Through various tests, I have discovered that the properties are set to readonly and only have access to mutable objects.

For example, the following is acceptable:

obj.position.x = 10;

However, attempting the following will result in no action:

obj.position = new THREE.Vector3(10, 0, 0);

Unfortunately, no visible errors or warnings will be triggered - the command will simply not be executed.

The correct way to achieve the desired outcome is as follows:

obj.position.set(10, 0, 0);

To identify any breaches of this new rule, search for the following snippets (you might want to use a regex to account for optional whitespace):

.position =
.rotation =
.quaternion =
.scale =

Answer 2

Through various tests, I have discovered that the properties are set to readonly and only have access to mutable objects.

For example, the following is acceptable:

obj.position.x = 10;

However, attempting the following will result in no action:

obj.position = new THREE.Vector3(10, 0, 0);

Unfortunately, no visible errors or warnings will be triggered - the command will simply not be executed.

The correct way to achieve the desired outcome is as follows:

obj.position.set(10, 0, 0);

To identify any breaches of this new rule, search for the following snippets (you might want to use a regex to account for optional whitespace):

.position =
.rotation =
.quaternion =
.scale =

Exploring the Unchanging Object3D Characteristics of ThreeJS Version 68

Answer №1

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