Issue: The variable cubeMaterial has not been defined in the JavaScript code

I've encountered an issue with my JavaScript code. I'm getting an error related to the line:

this.color = cubeMaterial.color.getHex();

As a beginner, I'm having trouble understanding what I'm doing wrong.

I attempted declaring the variable "var cubeMaterial;" outside of the function "createCube," but it resulted in the error "Can't read property 'color' of undefined." Any help would be appreciated!

    var scene,camera,renderer;

    function createScene() {
    // Setting up the scene and camera.

    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(45, window.innerWidth/ window.innerHeight, 0.1, 1000);
    camera.updateProjectionMatrix();
    
    ...

    

    // Function to add GUI controls
    ....

       }

    // More functions for creating lights, objects like plane, cube, sphere

...

    // Defining rendering logic

        }


    function init(){

    createScene();

    createLights();

    createPlane();

    createCube();

    createSphere();

    addControlGui(controls); 

    render();
    }

    window.addEventListener('load', init, false);

Answer №1

A common issue arises when dealing with scope in programming. Take note that defining a variable like cubeMaterial within a specific function confines its existence solely to that function.

On the other hand, variables declared at the beginning of your code, outside any functions like var scene,camera,renderer;, have a broader scope and can be accessed by all inner functions.

Understanding this concept is crucial. To resolve the problem, ensure you place the declaration of cubeMaterial in the appropriate scope. Consider moving it to the top alongside the scene declaration for better access.

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