public class Particle {
  float x, y, z;
  float vx, vy, vz;
  boolean alive;
  PImage tex;
  color ti;
  
  public Particle( float x, float y, float z,  float vx, float vy, float vz, PImage tex, color ti ) {
    this.tex = tex;  
    this.x = x;
    this.y = y;
    this.z = z;
    this.vx = vx;
    this.vy = vy;
    this.vz = vz;
    this.ti = ti;
    alive = true;
  }

  public Particle( float x, float y, float z,  float vx, float vy, float vz, PImage tex ) {
    this( x, y, z, vx, vy, vz, tex, color( 255, 255, 255 ));
  }
  
  public void update() {
    x += vx * 0.1f;
    y += vy * 0.1f;
    z += vz * 0.1f;
    
    vy += 0.1;
    
    if (y > 600) {
      alive = false;
    }
  }
  
  public void draw( float alph ) {
    pushMatrix();
    translate( x, y, z );
    rotateY( alph );
    textureMode(NORMALIZED);
    tint(ti);
    beginShape();
    texture( tex );
    vertex( -20, -20, 0, 0, 0 );
    vertex( -20, 20, 0, 0, 1 );
    vertex( 20, 20, 0, 1, 1 );
    vertex( 20, -20, 0, 1, 0 );
    endShape(CLOSE);
    popMatrix();
  }
  
  public boolean isAlive() {
    return alive;
  }
}