source: GTP/trunk/App/Demos/Vis/FriendlyCulling/VboFormatConverter/SimpleTri.cpp @ 3107

#include "SimpleTri.h"


using namespace std;


SimpleTri::SimpleTri(const SimpleVec &a, const SimpleVec &b, const SimpleVec &c) 
{
        Init(a, b, c);
}


void SimpleTri::Init(const SimpleVec &a, const SimpleVec &b, const SimpleVec &c) 
{
        mVertices[0] = a;
        mVertices[1] = b;
        mVertices[2] = c;
}


SimpleVec SimpleTri::GetNormal() const 
{
        const SimpleVec v1 = mVertices[0] - mVertices[1];
        const SimpleVec v2 = mVertices[2] - mVertices[1];

        return Normalize(CrossProd(v2, v1));
}


SimpleVec SimpleTri::GetWorldCenter() const 
{
        return (mVertices[0] + mVertices[1] + mVertices[2]) / 3.0f;
}


float SimpleTri::GetArea() const 
{
        SimpleVec v1 = mVertices[0] - mVertices[1], v2=mVertices[2] - mVertices[1];
        return 0.5f * Magnitude(CrossProd(v2, v1));
}