예제 #1
0
float Object::Shadow_box(Ray ray) const	// Bounding box function for shadows
{
	float t, thit = 1.0;
	float xmin, xmax, ymin, ymax, zmin, zmax;
	Vector Q;
	Vector i(1,0,0), j(0,1,0), k(0,0,1);
	Vector base = ray.getBase();
	Vector dir = ray.getDir();
	
	xmin = this->vmin.x;
	xmax = this->vmax.x;
	ymin = this->vmin.y;
	ymax = this->vmax.y;
	zmin = this->vmin.z;
	zmax = this->vmax.z;

	t = ray.intersect_plane(i, this->vmax);
	if( (t > 0.0) && (t < 1.0) )
	{
		Q = base + dir.scale(t);

		if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(i.scale(-1), this->vmin);
	if( (t > 0.0) && (t < 1.0) )
	{
		Q = base + dir.scale(t);
		
		if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(j, this->vmax);
	if( (t > 0.0) && (t < 1.0) )
	{
		Q = base + dir.scale(t);
				
		if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(j.scale(-1), this->vmin);
	if( (t > 0.0) && (t < 1.0) )
	{
		Q = base + dir.scale(t);
		
		if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(k, this->vmax);
	if( (t > 0.0) && (t < 1.0) )
	{
		Q = base + dir.scale(t);
		
		if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(k.scale(-1), this->vmin);
	if( (t > 0.0) && (t < 1.0) )
	{
		Q = base + dir.scale(t);
		
		if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
		{
			thit = t;
			return thit;
		}
	}
	return thit;
}
예제 #2
0
float Object::bound_box(Ray ray) const
{
	float t, thit = HUGEREAL;
	float xmin, xmax, ymin, ymax, zmin, zmax;
	Vector Q;
	Vector i(1,0,0), j(0,1,0), k(0,0,1);
	Vector base = ray.getBase();
	Vector dir = ray.getDir();
	
	xmin = this->vmin.x;
	xmax = this->vmax.x;
	ymin = this->vmin.y;
	ymax = this->vmax.y;
	zmin = this->vmin.z;
	zmax = this->vmax.z;

	t = ray.intersect_plane(i, this->vmax);
	if(t > 0.001)
	{
		Q = base + dir.scale(t);

		if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(i.scale(-1), this->vmin);
	if(t > 0.001)
	{
		Q = base + dir.scale(t);
		
		if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(j, this->vmax);
	if(t > 0.001)
	{
		Q = base + dir.scale(t);
				
		if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(j.scale(-1), this->vmin);
	if(t > 0.001)
	{
		Q = base + dir.scale(t);
		
		if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(k, this->vmax);
	if(t > 0.001)
	{
		Q = base + dir.scale(t);
		
		if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
		{
			thit = t;
			return thit;
		}
	}
	t = ray.intersect_plane(k.scale(-1), this->vmin);
	if(t > 0.001)
	{
		Q = base + dir.scale(t);
		
		if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
		{
			thit = t;
			return thit;
		}
	}
	return thit;
}