Can we expand the capabilities of a ThreeJS object in any way?

In my ThreeJS project, I am implementing an interactive feature where users can click on cubes that behave differently when clicked, such as having different color animations.

To achieve this, I plan to create extension classes for the THREE.Mesh object and incorporate custom functions and attributes. By doing so, I aim to segregate the various cube behaviors and enhance the clarity of my code.

Although I attempted to utilize John Resig's method for class extension, it appears to only work effectively with classes that ultimately derive from his "Class" class.

Is there an alternative approach to accomplish this goal?

javascriptoopinheritancethree.js

Answer №1

Creating class-based systems in Javascript can be done in various ways. While John Resig's "Class" is one option, it is not the same type of inheritance used in Three.js.

If you examine the Cube class file, you will see the following line:

THREE.Geometry.call( this );

Since Javascript does not have a built-in model for class inheritance, unless you are using a library like John Resig's that includes inheritance in class construction, you must explicitly call the super method.

To make your class inherit from CubeGeometry, you would need to include the following line inside your class:

THREE.CubeGeometry.call( this );

It is also recommended to set CubeGeometry as the prototype:

THREE.MyCubeGeometry.prototype = new THREE.CubeGeometry();
THREE.MyCubeGeometry.prototype.constructor = THREE.MyCubeGeometry;

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