Exploring intricate hexadecimal color values in three.js

While experimenting with three.js, I stumbled upon an interesting example HERE. In the init function provided in the example (only a snippet is shown here), we see:

    function init() {

        renderer = new THREE.WebGLRenderer( { antialias: true } );
        renderer.setPixelRatio( window.devicePixelRatio );
        renderer.setSize( window.innerWidth, window.innerHeight );
        container.appendChild( renderer.domElement );

        scene = new THREE.Scene();

        camera = new THREE.PerspectiveCamera( fov, window.innerWidth / window.innerHeight, 1, 1000 );
        camera.position.z = 100;
        camera.target = new THREE.Vector3();

        controls = new THREE.OrbitControls( camera, renderer.domElement );
        controls.minDistance = 50;
        controls.maxDistance = 200;

        scene.add( new THREE.AmbientLight( 0x443333 ) );

        var light = new THREE.DirectionalLight( 0xffddcc, 1 );
        light.position.set( 1, 0.75, 0.5 );
        scene.add( light );

        var light = new THREE.DirectionalLight( 0xccccff, 1 );
        light.position.set( -1, 0.75, -0.5 );
        scene.add( light );
        //.....  more code
}

In several instances within this code, the line of code:

scene.add( new THREE.AmbientLight( 0x443333 ) );

Raises the question, what does the color value 0x443333 actually represent? This peculiar format is unfamiliar to me. Could someone shed some light on its meaning?

Answer №1

Hexadecimal color codes are representations of RGB values using a hex encoded string.
These codes can be divided into three separate hexadecimal parts, one each for Red, Green, and Blue (RGB).

The conversion from hexadecimal to decimal works like this:

0 : 0
1 : 1
2 : 2
3 : 3
4 : 4
5 : 5
6 : 6
7 : 7
8 : 8
9 : 9
a : 10
b : 11
c : 12
d : 13
e : 14
f : 15

Therefore, the RGB values in this hex code translate to:

Red   = 44 -> 4 x 16 + 4 -> 68
Green = 33 -> 3 x 16 + 3 -> 51
Blue  = 33 -> 3 x 16 + 3 -> 51

This means that the color represented by this code is: rgb(68,51,51).

With hexadecimal encoding, there are 256 x 256 x 256 = 16777216 possible colors.

white : 0x000000 = rgb(0,0,0);
black : 0xffffff = rgb(255,255,255);
red   : 0xff0000 = rgb(255,0,0);
green : 0x00ff00 = rgb(0,255,0);
blue  : 0x0000ff = rgb(0,0,255);

For more color options, visit this website.

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