threejs-minecraft-27

class Explosion {
    constructor( x, y, z, color, scene, pointCount, movementSpeed, size ) {
        this.scene = scene;

        const geometry = new THREE.Geometry();
        const textureLoader = new THREE.TextureLoader();
        const smokeTexture = textureLoader.load( 'img/smoke.png' );

        this.material = new THREE.PointsMaterial({
            size: size || 10,
            color: color,
            map: smokeTexture,
            blending: THREE.CustomBlending,
            depthWrite: false,
            transparent: true,
            opacity: 0.7
       });

       this.pCount = pointCount || 1000;
       this.movementSpeed = movementSpeed || 10;
       this.dirs = [];
       for( let i = 0; i < this.pCount; i++ ) {
           const vertex = new THREE.Vector3( x, y, z );
           geometry.vertices.push( vertex );
           const r = this.movementSpeed * THREE.Math.randFloat( 0, 1 ) + 0.5;
           const theta = Math.random() * Math.PI * 2;
           const phi = Math.random() * Math.PI;
           this.dirs.push({
               x: r * Math.sin( phi ) * Math.cos( theta ),
               y: r * Math.sin( phi ) * Math.sin( theta ),
               z: r * Math.cos( phi )
           });
       }

       const points = new THREE.Points( geometry, this.material );
       this.object = points; this.scene.add( this.object );
    }

    update() {
        let p = this.pCount;
        const d = this.dirs;
        while( p-- ) {
            let particle = this.object.geometry.vertices[p];
            particle.x += d[p].x;
            particle.y += d[p].y;
            particle.z += d[p].z;
       }

       this.object.geometry.verticesNeedUpdate = true;
    }

    destroy() {
        this.object.geometry.dispose();
        this.scene.remove( this.object );
        this.dirs.length = 0;
    }

}