code: public float[] getValue() {
          float[] axisAngle = new float[4];
          axisAngle[0] = this.x;
          axisAngle[1] = this.y;
          axisAngle[2] = this.z;
          axisAngle[3] = this.angle;
          return axisAngle;
      }
docs: returns float[4] x, y, z, angle in radians