FlakesTexture.js

( function () {

	class FlakesTexture {

		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;

		}

	}

	THREE.FlakesTexture = FlakesTexture;

} )();