foreach (Touch t in Input.touches) {
						if (t.phase == TouchPhase.Began) {
								Ray ray = Camera.main.ScreenPointToRay (t.position);


//Input.mousePosition
								RaycastHit hit;
								if (Physics.Raycast (ray, out hit)) {
										if (hit.collider.tag == "ice") {
												//if (Input.GetMouseButtonDown (0)) {
												hit.collider.renderer.material.mainTexture = brick;
												//	print("oi");
												//atrito.friction=10f;
												hit.collider.tag = "brick";
												hit.collider.collider.sharedMaterial = brickmaterial;
										}
								} else {
										if (hit.collider.tag == "brick") {
												//	if (Input.GetMouseButtonDown (0)) {
												hit.collider.renderer.material.mainTexture = ice;
												//	print("oi");
												//atrito.friction=0;
												hit.collider.tag = "ice";
												hit.collider.collider.sharedMaterial = icematerial;
										}
								}
						}
				}
		}