///////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2002-2016, Open Design Alliance (the "Alliance").
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// All rights reserved.
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//
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// This software and its documentation and related materials are owned by
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// the Alliance. The software may only be incorporated into application
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// programs owned by members of the Alliance, subject to a signed
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// Membership Agreement and Supplemental Software License Agreement with the
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// Alliance. The structure and organization of this software are the valuable
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// trade secrets of the Alliance and its suppliers. The software is also
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// protected by copyright law and international treaty provisions. Application
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// programs incorporating this software must include the following statement
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// with their copyright notices:
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//
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// This application incorporates Teigha(R) software pursuant to a license
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// agreement with Open Design Alliance.
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// Teigha(R) Copyright (C) 2002-2016 by Open Design Alliance.
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// All rights reserved.
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//
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// By use of this software, its documentation or related materials, you
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// acknowledge and accept the above terms.
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///////////////////////////////////////////////////////////////////////////////
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#ifndef __OD_GI_UTILS__
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#define __OD_GI_UTILS__
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template <class T3dPtIter>
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void odgiSquareValues(OdInt32 nPoints, T3dPtIter pPoints, OdGeVector3d& n1, OdGeVector3d& n2)
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{
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OdGeVector3d res;
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nPoints -= 2;
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n1 = n2 = OdGeVector3d::kIdentity;
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for(T3dPtIter pPt1 = pPoints + 1, pPt2 = pPoints + 2; nPoints-- > 0; ++pPt1, ++pPt2)
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{
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res = (*pPt2 - *pPoints).crossProduct(*pPt1 - *pPoints);
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if(res.dotProduct(n1) >= 0.)
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n1 += res;
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else
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n2 += res;
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}
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}
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template <class T3dPtIter>
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OdGeVector3d odgiFaceNormal(OdInt32 nPoints, T3dPtIter pPoints)
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{
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OdGeVector3d n1, n2;
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odgiSquareValues(nPoints, pPoints, n1, n2);
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n1 += n2;
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OdGe::ErrorCondition f;
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n1.normalize(OdGeContext::gZeroTol, f);
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if(f!=OdGe::kOk)
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return n2.normalize(OdGeContext::gZeroTol, f);
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return n1;
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}
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#endif // __OD_GI_UTILS__
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