code: public BubbleValue setTarget(float targetX, float targetY, float targetZ) {
          set(x, y, z);
          this.diffX = targetX - originX;
          this.diffY = targetY - originY;
          this.diffZ = targetZ - originZ;
          return this;
      }
docs: Set target values that should be reached when data animation finish then call {@link Chart#startDataAnimation()}