nuclear@0: #include "bvol.h"
nuclear@0: 
nuclear@0: bool AABox::intersect(const Ray &ray) const
nuclear@0: {
nuclear@0: 	Vector3 param[2] = {vmin, vmax};
nuclear@0: 	Vector3 inv_dir(1.0 / ray.dir.x, 1.0 / ray.dir.y, 1.0 / ray.dir.z);
nuclear@0: 	int sign[3] = {inv_dir.x < 0, inv_dir.y < 0, inv_dir.z < 0};
nuclear@0: 
nuclear@0: 	float tmin = (param[sign[0]].x - ray.origin.x) * inv_dir.x;
nuclear@0: 	float tmax = (param[1 - sign[0]].x - ray.origin.x) * inv_dir.x;
nuclear@0: 	float tymin = (param[sign[1]].y - ray.origin.y) * inv_dir.y;
nuclear@0: 	float tymax = (param[1 - sign[1]].y - ray.origin.y) * inv_dir.y;
nuclear@0: 
nuclear@0: 	if(tmin > tymax || tymin > tmax) {
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 	if(tymin > tmin) {
nuclear@0: 		tmin = tymin;
nuclear@0: 	}
nuclear@0: 	if(tymax < tmax) {
nuclear@0: 		tmax = tymax;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	float tzmin = (param[sign[2]].z - ray.origin.z) * inv_dir.z;
nuclear@0: 	float tzmax = (param[1 - sign[2]].z - ray.origin.z) * inv_dir.z;
nuclear@0: 
nuclear@0: 	if(tmin > tzmax || tzmin > tmax) {
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 	if(tzmin > tmin) {
nuclear@0: 		tmin = tzmin;
nuclear@0: 	}
nuclear@0: 	if(tzmax < tmax) {
nuclear@0: 		tmax = tzmax;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	return true;
nuclear@0: }