diff -Naurw include/triangle3d.h include/triangle3d.h
--- include/triangle3d.h	2005-09-16 13:15:50.000000000 +0200
+++ include/triangle3d.h	2005-11-27 00:05:02.000000000 +0100
@@ -60,7 +60,7 @@
 		bool isPointInside(const vector3d<T>& p) const
 		{
 			return (isOnSameSide(p, pointA, pointB, pointC) &&
-				isOnSameSide(p, pointB, pointA, pointC) &&
+				isOnSameSide(p, pointB, pointC, pointA) &&
 				isOnSameSide(p, pointC, pointA, pointB));
 		}
 
@@ -128,7 +128,7 @@
 			const vector3d<T>& lineVect, vector3d<T>& outIntersection) const
 		{
 			if (getIntersectionOfPlaneWithLine(linePoint, lineVect, outIntersection))
-				return isPointInside(outIntersection);
+				return isPointInsideFast( outIntersection );
 
 			return false;			
 		}
@@ -150,8 +149,12 @@
 			if (t2 == 0.0f)
 				return false;
 
-			T d = pointA.dotProduct(normal);
-			T t = -(normal.dotProduct(linePoint) - d) / t2;
+			core::vector3d<T> midPoint;
+			midPoint.X = ( pointA.X + pointB.X + pointC.X ) / 3.0f;
+			midPoint.Y = ( pointA.Y + pointB.Y + pointC.Y ) / 3.0f;
+			midPoint.Z = ( pointA.Z + pointB.Z + pointC.Z ) / 3.0f;
+			T d = -midPoint.dotProduct( normal );
+			T t = -(( normal.dotProduct( linePoint ) + d ) / t2);
 			outIntersection = linePoint + (lineVect * t);
 			return true;
 		}