public Builder clearTiltAngle() {
      bitField0_ = (bitField0_ & ~0x00000020);
      tiltAngle_ = 0F;
      onChanged();
      return this;
    }
<pre>
Pitch angle, which indicates the upwards/downwards angle that the face is
pointing relative to the image's horizontal plane. Range [-180,180].
</pre>

<code>float tilt_angle = 6;</code>

@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1p2beta1/src/main/java/com/google/cloud/vision/v1p2beta1/FaceAnnotation.java