diff --git a/gtsam/slam/MultiDisparityFactor.cpp b/gtsam/slam/MultiDisparityFactor.cpp
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+++ b/gtsam/slam/MultiDisparityFactor.cpp
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+/*
+ * MultiDisparityFactor.cpp
+ *
+ *  Created on: Jan 30, 2014
+ *      Author: nsrinivasan7
+ */
+
+
+
+
diff --git a/gtsam/slam/MultiDisparityFactor.h b/gtsam/slam/MultiDisparityFactor.h
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+/* ----------------------------------------------------------------------------
+
+ * Atlanta, Georgia 30332-0415
+ * All Rights Reserved
+ * GTSAM Copyright 2010, Georgia Tech Research Corporation,
+ * Authors: Frank Dellaert, et al. (see THANKS for the full author list)
+
+ * See LICENSE for the license information
+
+ * -------------------------------------------------------------------------- */
+
+/*
+ * @file MultiDisparityFactor.h
+ * @date Jan 30, 2013
+ * @author Natesh Srinivasan
+ * @brief A factor for modeling the disparity across multiple views
+ */
+
+#include <gtsam/geometry/OrientedPlane3.h>
+
+namespace gtsam {
+
+/**
+ * Unary factor on measured disparity from multiple views as deterministic function of camera pose
+ */
+
+class MutiDisparityFactor : public NoiseModelFactor1<OrientedPlane3> {
+
+protected :
+  Symbol landmarkSymbol_;
+  OrientedPlane3 measured_p_;
+
+  typedef NoiseModelFactor1<OrientedPlane3 > Base;
+
+public:
+
+  /// Constructor
+  MutiDisparityFactor ()
+   {}
+
+   /// Constructor with measured plane coefficients (a,b,c,d), noise model, pose symbol
+  MutiDisparityFactor (const Vector&z, const SharedGaussian& noiseModel,
+                const Symbol& pose,
+                const Symbol& landmark)
+     : Base (noiseModel, landmark),
+       poseSymbol_ (pose),
+       landmarkSymbol_ (landmark),
+       measured_coeffs_ (z)
+   {
+     measured_p_ = OrientedPlane3 (Sphere2 (z (0), z (1), z (2)), z (3));
+   }
+
+   /// print
+   void print(const std::string& s="PlaneFactor") const;
+
+   virtual Vector evaluateError(const Pose3& pose, const OrientedPlane3& plane,
+                                boost::optional<Matrix&> H1 = boost::none,
+                                boost::optional<Matrix&> H2 = boost::none) const
+   {
+     OrientedPlane3 predicted_plane = OrientedPlane3::Transform (plane, pose, H1, H2);
+     Vector error = predicted_plane.error (measured_p_);
+     return (error);
+   };
+};
+
+class OrientedPlane3DirectionPrior: public NoiseModelFactor1<OrientedPlane3> {
+
+ protected:
+   OrientedPlane3 measured_p_; /// measured plane parameters
+   Symbol landmarkSymbol_;
+
+   typedef NoiseModelFactor1<OrientedPlane3 > Base;
+
+ public:
+
+   typedef OrientedPlane3DirectionPrior This;
+   /// Constructor
+   OrientedPlane3DirectionPrior ()
+   {}
+
+   /// Constructor with measured plane coefficients (a,b,c,d), noise model, landmark symbol
+   OrientedPlane3DirectionPrior (const Symbol& landmark, const Vector&z,
+       const SharedGaussian& noiseModel)
+     : Base (noiseModel, landmark),
+       landmarkSymbol_ (landmark)
+   {
+     measured_p_ = OrientedPlane3 (Sphere2 (z (0), z (1), z (2)), z (3));
+   }
+
+   /// print
+   void print(const std::string& s) const;
+
+   /** equals */
+   virtual bool equals(const NonlinearFactor& expected, double tol = 1e-9) const;
+
+   virtual Vector evaluateError(const OrientedPlane3& plane,
+                                boost::optional<Matrix&> H = boost::none) const;
+};
+
+
+};
+}