/*
-----------------------------------------------------------------------
Copyright: 2010-2015, iMinds-Vision Lab, University of Antwerp
           2014-2015, CWI, Amsterdam

Contact: astra@uantwerpen.be
Website: http://sf.net/projects/astra-toolbox

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/>.

-----------------------------------------------------------------------
$Id$
*/

#ifndef _INC_ASTRA_GEOMETRYUTIL3D
#define _INC_ASTRA_GEOMETRYUTIL3D

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;
};

void computeBP_UV_Coeffs(const SPar3DProjection& proj,
                         double &fUX, double &fUY, double &fUZ, double &fUC,
                         double &fVX, double &fVY, double &fVZ, double &fVC);

void computeBP_UV_Coeffs(const SConeProjection& proj,
                         double &fUX, double &fUY, double &fUZ, double &fUC,
                         double &fVX, double &fVY, double &fVZ, double &fVC,
                         double &fDX, double &fDY, double &fDZ, double &fDC);

}

#endif