Somemwhat optimized the line drawing for hopefully lower resource intensive collisions.

Author: teejay

FlickBall/MFLDynamicsHelpers/Alpha Only Collision/MFLAlphaCollision.m

@@ -36,6 +36,7 @@ + (void)addBoundaryToBehavior:(UICollisionBehavior*)behavior
     UIImage *flippedImage = [imageView.image imageRotatedByDegrees:180];
 
     UIBezierPath *viewPath = [[[PathBuilder alloc] initWithMask:flippedImage.CGImage] path];
+    [viewPath setMiterLimit:20];
     [viewPath applyTransform:CGAffineTransformMakeTranslation(imageView.frame.origin.x, imageView.frame.origin.y)];
     [behavior addBoundaryWithIdentifier:identifier forPath:viewPath];
 }

FlickBall/MFLDynamicsHelpers/Alpha Only Collision/PathBuilder.m

@@ -185,7 +185,7 @@ - (UIBezierPath *) convertSegmentsIntoPath:(NSMutableDictionary*)segments
 	//	until all line segments have been consumed.
 
 	UIBezierPath *path = [UIBezierPath bezierPath];
-	
+	[path setLineJoinStyle:kCGLineJoinRound];
 	// While we still have line segments to consume, unwind one bezier path
 	while ( [segments count] > 0 )
 		[self unwindOneSegmentPath:segments intoPath:path];
@@ -318,7 +318,7 @@ - (void) addPoint:(CGPoint)newPoint toPath:(UIBezierPath *)path cachedPoint1:(CG
 		*point2 = newPoint;
 	} else {
 		// We changed direction, so flush the current segment, and reset the cache
-		[path addLineToPoint:*point2];
+		[path addQuadCurveToPoint:*point2 controlPoint:*point1];
 
 		*point1 = *point2;
 		*point2 = newPoint;