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diff --git a/include/astra/Float32Data3DGPU.h b/include/astra/Float32Data3DGPU.h
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+++ b/include/astra/Float32Data3DGPU.h
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+/*
+-----------------------------------------------------------------------
+Copyright: 2010-2016, iMinds-Vision Lab, University of Antwerp
+           2014-2016, CWI, Amsterdam
+
+Contact: astra@uantwerpen.be
+Website: http://www.astra-toolbox.com/
+
+This file is part of the ASTRA Toolbox.
+
+
+The ASTRA Toolbox is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+The ASTRA Toolbox is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
+
+-----------------------------------------------------------------------
+*/
+
+#ifndef _INC_ASTRA_FLOAT32DATA3DGPU
+#define _INC_ASTRA_FLOAT32DATA3DGPU
+
+#ifdef ASTRA_CUDA
+
+#include "Globals.h"
+#include "Float32Data3D.h"
+
+#include "../../cuda/3d/mem3d.h"
+
+namespace astra {
+
+
+astraCUDA3d::MemHandle3D wrapHandle(float *D_ptr, unsigned int x, unsigned int y, unsigned int z, unsigned int pitch);
+
+
+/** 
+ * This class represents a 3-dimensional block of 32-bit floating point data.
+ * The data block is stored on a GPU, and owned by external code.
+ *
+ * TODO: Store/remember which GPU the data is stored on
+ */
+class _AstraExport CFloat32Data3DGPU : public virtual CFloat32Data3D {
+
+protected:
+	/** Handle for the memory block */
+	astraCUDA3d::MemHandle3D m_hnd;
+
+	/** Clear all member variables, setting all numeric variables to 0 and all pointers to NULL. 
+	 */
+	void _clear();
+
+	/** Un-initialize the object, bringing it back in the unitialized state.
+	 */
+	void _unInit();
+
+	/** Initialization. Initializes an instance of the CFloat32Data3DGPU class.
+	 * Can only be called by derived classes.
+	 *
+	 * This function does not set m_bInitialized to true if everything is ok.
+	 *
+	 * @param _iWidth width of the 3D data (x-axis), must be > 0
+	 * @param _iHeight height of the 3D data (y-axis), must be > 0
+	 * @param _iDepth depth of the 3D data (z-axis), must be > 0
+	 * @param _hnd the CUDA memory handle
+	 */
+
+	bool _initialize(int _iWidth, int _iHeight, int _iDepth, astraCUDA3d::MemHandle3D _hnd);
+
+public:
+
+	/** Default constructor. Sets all numeric member variables to 0 and all pointer member variables to NULL.
+	 *
+	 * If an object is constructed using this default constructor, it must always be followed by a call 
+	 * to one of the initialize() methods before the object can be used. Any use before calling init() is not allowed,
+	 * except calling the member function isInitialized().
+	 *
+	 */
+	CFloat32Data3DGPU();
+
+	/** Destructor.
+	 */
+	virtual ~CFloat32Data3DGPU();
+
+	/** which type is this class?
+	 *
+	 * @return DataType: ASTRA_DATATYPE_FLOAT32_PROJECTION or
+	 *					 ASTRA_DATATYPE_FLOAT32_VOLUME
+	 */
+	virtual EDataType getType() const { return BASE; }
+
+	astraCUDA3d::MemHandle3D getHandle() const { return m_hnd; }
+
+};
+
+} // end namespace astra
+
+#endif
+
+#endif // _INC_ASTRA_FLOAT32DATA3DGPU