CWE-ou-minkata/Sources/Plasma/CoreLib/hsGeometry3.cpp

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*==LICENSE==*/

#include <cmath>
#pragma hdrstop

#include "hsGeometry3.h"
#include "hsStream.h"

hsVector3 operator%(const hsVector3& t, const hsVector3& s)
{
    hsVector3       result;

    return *result.Set((t.fY * s.fZ) - (s.fY * t.fZ),
                      -(t.fX * s.fZ) + (s.fX * t.fZ),
                       (t.fX * s.fY) - (s.fX * t.fY));
}




//////////////////////////////////
/////////////////////////////////
float hsScalarTriple::Magnitude() const
{
    return sqrt(MagnitudeSquared());
}

void hsScalarTriple::Read(hsStream *stream)
{
    
    // DANGER for speed read directly into these variables...ASSUMES fX,fY, and fZ are in contiguous order (PBG)
    stream->Read12Bytes(&fX);
}

void hsScalarTriple::Write(hsStream *stream) const
{
    stream->WriteLEScalar(fX);
    stream->WriteLEScalar(fY);
    stream->WriteLEScalar(fZ);
}

hsPlane3::hsPlane3(const hsPoint3* pt1, const hsPoint3* pt2, const hsPoint3* pt3)
{
    // convert into a point with two vectors
    hsVector3 v1(pt2, pt1);
    hsVector3 v2(pt3, pt1);

    // calculate the normal (wedge)
    fN.fX = (v1.fY * v2.fZ) - (v2.fY * v1.fZ);
    fN.fY = (v1.fZ * v2.fX) - (v2.fZ * v1.fX);
    fN.fZ = (v1.fX * v2.fY) - (v2.fX * v1.fY);
    fN.Normalize();

    fD = -pt1->InnerProduct(&fN);
}


void hsPlane3::Read(hsStream *stream) 
{ 
    fN.Read(stream); 
    fD=stream->ReadLEScalar(); 
}

void hsPlane3::Write(hsStream *stream) const 
{ 
    fN.Write(stream); 
    stream->WriteLEScalar(fD); 
}