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diff --git a/cuda/3d/dims3d.h b/cuda/3d/dims3d.h
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+/*
+-----------------------------------------------------------------------
+Copyright 2012 iMinds-Vision Lab, University of Antwerp
+
+Contact: astra@ua.ac.be
+Website: http://astra.ua.ac.be
+
+
+This file is part of the
+All Scale Tomographic Reconstruction Antwerp Toolbox ("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/>.
+
+-----------------------------------------------------------------------
+$Id$
+*/
+
+#ifndef _CUDA_CONE_DIMS_H
+#define _CUDA_CONE_DIMS_H
+
+namespace astra {
+
+struct SConeProjection {
+	// the source
+	double fSrcX, fSrcY, fSrcZ;
+
+	// the origin ("bottom left") of the (flat-panel) detector
+	double fDetSX, fDetSY, fDetSZ;
+
+	// the U-edge of a detector pixel
+	double fDetUX, fDetUY, fDetUZ;
+
+	// the V-edge of a detector pixel
+	double fDetVX, fDetVY, fDetVZ;
+};
+
+struct SPar3DProjection {
+	// the ray direction
+	double fRayX, fRayY, fRayZ;
+
+	// the origin ("bottom left") of the (flat-panel) detector
+	double fDetSX, fDetSY, fDetSZ;
+
+	// the U-edge of a detector pixel
+	double fDetUX, fDetUY, fDetUZ;
+
+	// the V-edge of a detector pixel
+	double fDetVX, fDetVY, fDetVZ;
+};
+
+}
+
+
+namespace astraCUDA3d {
+
+using astra::SConeProjection;
+using astra::SPar3DProjection;
+
+struct SDimensions3D {
+	unsigned int iVolX;
+	unsigned int iVolY;
+	unsigned int iVolZ;
+	unsigned int iProjAngles;
+	unsigned int iProjU; // number of detectors in the U direction
+	unsigned int iProjV; // number of detectors in the V direction
+	unsigned int iRaysPerDetDim;
+	unsigned int iRaysPerVoxelDim;
+};
+
+}
+
+#endif
+