aabox.cpp

frustumculling in c++,完整的小demo

/* ------------------------------------------------------

 Axis Aligned Boxes - Lighthouse3D

  -----------------------------------------------------*/

#include "AABox.h"




AABox::AABox( Vec3 &corner,  float x, float y, float z) {

	setBox(corner,x,y,z);
}



AABox::AABox(void) {


	corner.x = 0; corner.y = 0; corner.z = 0;

	x = 1.0f;
	y = 1.0f;
	z = 1.0f;
	
}


AABox::~AABox() {}

	

void AABox::setBox( Vec3 &corner,  float x, float y, float z) {


	this->corner.copy(corner);

	if (x < 0.0) {
		x = -x;
		this->corner.x -= x;
	}
	if (y < 0.0) {
		y = -y;
		this->corner.y -= y;
	}
	if (z < 0.0) {
		z = -z;
		this->corner.z -= z;
	}
	this->x = x;
	this->y = y;
	this->z = z;


}



Vec3 AABox::getVertexP(Vec3 &normal) {

	Vec3 res = corner;

	if (normal.x > 0)
		res.x += x;

	if (normal.y > 0)
		res.y += y;

	if (normal.z > 0)
		res.z += z;

	return(res);
}



Vec3 AABox::getVertexN(Vec3 &normal) {

	Vec3 res = corner;

	if (normal.x < 0)
		res.x += x;

	if (normal.y < 0)
		res.y += y;

	if (normal.z < 0)
		res.z += z;

	return(res);
}