ground.cpp

蒙特卡罗方法可以有效地解决复杂的工程问题

// Ground.cpp: implementation of the CGround class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "RayTrace.h"
#include "Ground.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

//构造函数,初始化数据成员
CGround::CGround()
	:
	vecNormal (0.,0.,1.)
{
}

//析构函数
CGround::~CGround()
{

}

CVector CGround::GetNormalVec()
{
	return vecNormal;
}

double CGround::Intersect()
{
	double dintersect;
	if( HitRay-> Direction.GetZ() == 0 )
		dintersect = 0.;
	else
	{
		dintersect = -HitRay->StartPoint.GetZ() / HitRay->Direction.GetZ();
		if( dintersect < SMALL )
			dintersect = 0.;
	}

	if( dintersect != 0.0 )
	{
		IntersectPoint = HitRay->Direction;
		IntersectPoint *= dintersect;
		IntersectPoint +=HitRay->StartPoint;
	}
	return dintersect;
}

CVector CGround::Mapping()
{
	double x,y;
	int xrange,yrange;
	int tu,tv;
	int tempu,tempv;

	x = IntersectPoint.GetX();
	y = IntersectPoint.GetY();
	tu = (int)floor( (double)abs(x) );
	tv = (int)floor( (double)abs(y) );

	xrange = yrange = 250;//500

	tempu = tu % xrange;
	tu = tu - tempu;
	tempv = tv % yrange;
	tv = tv - tempv;

	double u,v;
	u = ( fabs(x) - (double)tu ) / (double)xrange;
	v = ( fabs(y) - (double)tv ) / (double)yrange;

	if( x < 0 )
		u = 1.0 - u;
	if( y < 0 )
		v = 1.0 - v;

	return Texture->GetColor(u,v);
}