//sprite with horizontal physics body
spriteMatrix[i][j].physicsBody = SKPhysicsBody(edgeFromPoint: CGPointMake(0, tileSegmentHeight), toPoint: CGPointMake(tileSegmentWidth, tileSegmentHeight))
spriteMatrix[i][j].physicsBody!.categoryBitMask = self.surfaceCatagory
spriteMatrix[i][j].physicsBody!.contactTestBitMask = heroCatagory

//sprite with vertical physics body
self.hero.physicsBody = SKPhysicsBody(edgeFromPoint: CGPointMake(self.hero.frame.width / 2, self.hero.frame.height / 2), toPoint: CGPointMake(self.hero.frame.width / 2, -20))
self.hero.physicsBody!.categoryBitMask = heroCatagory
self.hero.physicsBody!.contactTestBitMask = surfaceCatagory