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diff --git a/src/core/Lut3DOp.h b/src/core/Lut3DOp.h
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+/*
+Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
+All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+* Neither the name of Sony Pictures Imageworks nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef INCLUDED_OCIO_LUT3DOP_H
+#define INCLUDED_OCIO_LUT3DOP_H
+
+#include <OpenColorIO/OpenColorIO.h>
+
+#include "Mutex.h"
+#include "Op.h"
+
+#include <vector>
+
+OCIO_NAMESPACE_ENTER
+{
+    // TODO: turn into a class instead of a struct?
+    
+    struct Lut3D;
+    typedef OCIO_SHARED_PTR<Lut3D> Lut3DRcPtr;
+    
+    struct Lut3D
+    {
+        static Lut3DRcPtr Create();
+        
+        float from_min[3];
+        float from_max[3];
+        int size[3];
+        
+        typedef std::vector<float> fv_t;
+        fv_t lut;
+        
+        std::string getCacheID() const;
+        
+    private:
+        Lut3D();
+        mutable std::string m_cacheID;
+        mutable Mutex m_cacheidMutex;
+    };
+    
+    // RGB channel ordering.
+    // Pixels ordered in such a way that the blue coordinate changes fastest,
+    // then the green coordinate, and finally, the red coordinate changes slowest
+    
+    inline int GetLut3DIndex_B(int indexR, int indexG, int indexB,
+                               int sizeR,  int sizeG,  int /*sizeB*/)
+    {
+        return 3 * (indexR + sizeR * (indexG + sizeG * indexB));
+    }
+    
+    
+    // RGB channel ordering.
+    // Pixels ordered in such a way that the red coordinate changes fastest,
+    // then the green coordinate, and finally, the blue coordinate changes slowest
+    
+    inline int GetLut3DIndex_R(int indexR, int indexG, int indexB,
+                               int /*sizeR*/,  int sizeG,  int sizeB)
+    {
+        return 3 * (indexB + sizeB * (indexG + sizeG * indexR));
+    }
+    
+    // What is the preferred order for the lut3d?
+    // I.e., are the first two entries change along
+    // the blue direction, or the red direction?
+    // OpenGL expects 'red'
+    
+    enum Lut3DOrder
+    {
+        LUT3DORDER_FAST_RED = 0,
+        LUT3DORDER_FAST_BLUE
+    };
+    
+    void GenerateIdentityLut3D(float* img, int edgeLen, int numChannels,
+                               Lut3DOrder lut3DOrder);
+    
+    // Essentially the cube root, but will throw an exception if the
+    // cuberoot is not exact.
+    int Get3DLutEdgeLenFromNumPixels(int numPixels);
+    
+    
+    
+    void CreateLut3DOp(OpRcPtrVec & ops,
+                       Lut3DRcPtr lut,
+                       Interpolation interpolation,
+                       TransformDirection direction);
+}
+OCIO_NAMESPACE_EXIT
+
+#endif