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diff --git a/dep/g3dlite/G3D/PhysicsFrame.h b/dep/g3dlite/G3D/PhysicsFrame.h
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+/**
+ @file PhysicsFrame.h
+
+ @maintainer Morgan McGuire, http://graphics.cs.williams.edu
+ 
+ @created 2002-07-08
+ @edited  2006-01-10
+*/
+
+#ifndef G3D_PHYSICSFRAME_H
+#define G3D_PHYSICSFRAME_H
+
+#include "G3D/platform.h"
+#include "G3D/Vector3.h"
+#include "G3D/Matrix3.h"
+#include "G3D/Quat.h"
+#include "G3D/CoordinateFrame.h"
+#include <math.h>
+#include <string>
+
+
+namespace G3D {
+
+/**
+  An RT transformation using a quaternion; suitable for
+  physics integration.
+
+  This interface is in "Beta" and will change in the next release.
+ */
+class PhysicsFrame {
+public:
+
+    Quat    rotation;
+
+    /**
+     Takes object space points to world space.
+     */
+    Vector3 translation;
+
+    /**
+     Initializes to the identity frame.
+     */
+    PhysicsFrame();
+
+    /**
+     Purely translational force
+     */
+    PhysicsFrame(const Vector3& translation) : translation(translation) {}
+
+    PhysicsFrame(const CoordinateFrame& coordinateFrame);
+
+    /** Compose: create the transformation that is <I>other</I> followed by <I>this</I>.*/
+    PhysicsFrame operator*(const PhysicsFrame& other) const;
+
+    virtual ~PhysicsFrame() {}
+
+    CoordinateFrame toCoordinateFrame() const;
+
+    /**
+     Linear interpolation (spherical linear for the rotations).
+     */
+    PhysicsFrame lerp(
+        const PhysicsFrame&     other,
+        float                   alpha) const;
+
+    void deserialize(class BinaryInput& b);
+
+    void serialize(class BinaryOutput& b) const;
+
+};
+
+} // namespace
+
+#endif