3d

float prozentualeAngabe = (float)this.nSegmentsHeight / (float)rings;

for(int i = 0;i <= rings;i++){
      beginShape(QUAD_STRIP);
      for(int k = 0;k <= this.nSegmente;k++){
        float x = this.radiusBot*cos(angleSize*k);
        float y = this.radiusBot*sin(angleSize*k);
        float x2 = this.radiusTop*cos(angleSize*k);
        float y2 = this.radiusTop*sin(angleSize*k);

        vertex(x,0,y);
        vertex(x2,prozentualeAngabe*i,y2);
      }
      endShape();
}