public Builder clear() {
        super.clear();
        tag_ = 0L;
        bitField0_ = (bitField0_ & ~0x00000001);
        type_ = org.box2d.proto.Box2D.PbBodyType.STATIC;
        bitField0_ = (bitField0_ & ~0x00000002);
        if (positionBuilder_ == null) {
          position_ = org.box2d.proto.Box2D.PbVec2.getDefaultInstance();
        } else {
          positionBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000004);
        angle_ = 0F;
        bitField0_ = (bitField0_ & ~0x00000008);
        if (linearVelocityBuilder_ == null) {
          linearVelocity_ = org.box2d.proto.Box2D.PbVec2.getDefaultInstance();
        } else {
          linearVelocityBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000010);
        angularVelocity_ = 0F;
        bitField0_ = (bitField0_ & ~0x00000020);
        if (forceBuilder_ == null) {
          force_ = org.box2d.proto.Box2D.PbVec2.getDefaultInstance();
        } else {
          forceBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000040);
        torque_ = 0F;
        bitField0_ = (bitField0_ & ~0x00000080);
        mass_ = 0F;
        bitField0_ = (bitField0_ & ~0x00000100);
        i_ = 0F;
        bitField0_ = (bitField0_ & ~0x00000200);
        linearDamping_ = 0F;
        bitField0_ = (bitField0_ & ~0x00000400);
        angularDamping_ = 0F;
        bitField0_ = (bitField0_ & ~0x00000800);
        gravityScale_ = 0F;
        bitField0_ = (bitField0_ & ~0x00001000);
        bullet_ = false;
        bitField0_ = (bitField0_ & ~0x00002000);
        allowSleep_ = false;
        bitField0_ = (bitField0_ & ~0x00004000);
        awake_ = false;
        bitField0_ = (bitField0_ & ~0x00008000);
        active_ = false;
        bitField0_ = (bitField0_ & ~0x00010000);
        fixedRotation_ = false;
        bitField0_ = (bitField0_ & ~0x00020000);
        if (fixturesBuilder_ == null) {
          fixtures_ = java.util.Collections.emptyList();
          bitField0_ = (bitField0_ & ~0x00040000);
        } else {
          fixturesBuilder_.clear();
        }
        return this;
      }