mgcdistvec3pln3.cpp

3D Game Engine Design Source Code非常棒

// Magic Software, Inc.
// http://www.magic-software.com
// Copyright (c) 2000, All Rights Reserved
//
// Source code from Magic Software is supplied under the terms of a license
// agreement and may not be copied or disclosed except in accordance with the
// terms of that agreement.  The various license agreements may be found at
// the Magic Software web site.  This file is subject to the license
//
// FREE SOURCE CODE
// http://www.magic-software.com/License/free.pdf

#include "MgcDistVec3Pln3.h"

//----------------------------------------------------------------------------
MgcReal MgcDistance (const MgcVector3& rkPoint, const MgcVector3& rkNormal,
    const MgcVector3& rkOrigin, MgcVector3* pkClosest)
{
    MgcVector3 kDiff = rkPoint - rkOrigin;
    MgcReal fSignedDist = rkNormal.Dot(kDiff);

    if ( pkClosest )
        *pkClosest = rkPoint - fSignedDist*rkNormal;

    return MgcMath::Abs(fSignedDist);
}
//----------------------------------------------------------------------------
MgcReal MgcDistance (const MgcVector3& rkPoint, const MgcVector3& rkNormal,
    MgcReal fConstant, MgcVector3* pkClosest)
{
    MgcReal fSignedDist = rkNormal.Dot(rkPoint) - fConstant;

    if ( pkClosest )
        *pkClosest = rkPoint - fSignedDist*rkNormal;

    return MgcMath::Abs(fSignedDist);
}
//----------------------------------------------------------------------------