Accueil / npm / three@0.186.1 / examples / jsm / textures / FlakesTexture.js
FlakesTexture.js
/**
* Utility class for generating a flakes texture image. This image might be used
* as a normal map to produce a car paint like effect.
*
* @three_import import { FlakesTexture } from 'three/addons/textures/FlakesTexture.js';
*/
class FlakesTexture {
/**
* Generates a new flakes texture image. The result is a canvas
* that can be used as an input for {@link CanvasTexture}.
*
* @param {number} [width=512] - The width of the image.
* @param {number} [height=512] - The height of the image.
* @return {HTMLCanvasElement} The generated image.
*/
constructor( width = 512, height = 512 ) {
const canvas = document.createElement( 'canvas' );
canvas.width = width;
canvas.height = height;
const context = canvas.getContext( '2d' );
context.fillStyle = 'rgb(127,127,255)';
context.fillRect( 0, 0, width, height );
for ( let i = 0; i < 4000; i ++ ) {
const x = Math.random() * width;
const y = Math.random() * height;
const r = Math.random() * 3 + 3;
let nx = Math.random() * 2 - 1;
let ny = Math.random() * 2 - 1;
let nz = 1.5;
const l = Math.sqrt( nx * nx + ny * ny + nz * nz );
nx /= l; ny /= l; nz /= l;
context.fillStyle = 'rgb(' + ( nx * 127 + 127 ) + ',' + ( ny * 127 + 127 ) + ',' + ( nz * 255 ) + ')';
context.beginPath();
context.arc( x, y, r, 0, Math.PI * 2 );
context.fill();
}
return canvas;
}
}
export { FlakesTexture };