float radius	= 10;
float distS	= plane.GetDistance(org);
float distD	= plane.GetDistance(dest);

vector3 ray = dest - org;
ray.normalize();

if(distS == distD)
	continue;

// either we are hitting the plane either we crossed it.

if( (fabs(distD) < radius)	|| 
	(distS>0 && distD<0)	|| 
	(distS<0 && distD>0))
{
	// Get intersection point on the plane.

	vector3 intersection = org + ray*distS;

	// Check if the intersection is within the triangle

	vector3 edge1 = pt2-pt1;
	vector3 norm1 = CrossProduct(edge1,plane.normal);
	norm1.normalize();
	Plane plane1(norm1,pt1);
	if(plane1.GetSide(pt3) == Plane::POSITIVE_SIDE)
	{
		plane1.normal = -plane1.normal;
	}
	float dist1 = plane1.GetDistance(intersection);
	if(dist1 > radius)
		continue;
	
	vector3 edge2 = pt3-pt2;
	vector3 norm2 = CrossProduct(edge2,plane.normal);
	norm2.normalize();
	Plane plane2(norm2,pt2);
	if(plane2.GetSide(pt1) == Plane::POSITIVE_SIDE)
	{
		plane2.normal = -plane2.normal;
	}
	float dist2 = plane2.GetDistance(intersection);
	if(dist2 > radius)
		continue;

	vector3 edge3 = pt1-pt3;
	vector3 norm3 = CrossProduct(edge3,plane.normal);
	norm3.normalize();
	Plane plane3(norm3,pt3);
	if(plane3.GetSide(pt2) == Plane::POSITIVE_SIDE)
	{
		plane3.normal = -plane3.normal;
	}
	float dist3 = plane3.GetDistance(intersection);
	if(dist3 > radius)
		continue;

	// Our ray intersect the triangle