rspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 10000);
        camera.position.set(0, 300, 500);
        scene = new THREE.Scene();

        for (var i = 0; i < 100; i++) {
            var particle = new THREE.Particle(new THREE.ParticleCanvasMaterial({ color: Math.random() * 0x808080 + 0x808080, program: programStroke }));
            particle.position.x = Math.random() * 800 - 400;
            particle.position.y = Math.random() * 800 - 400;
            particle.position.z = Math.random() 