Freeze rotation along the Z-axis.
//This example shows how RigidbodyConstraints is used to freeze the position and rotation of a Rigidbody in the z axis at start-up. //It also shows what happens when these constraints are removed, when you press the space key //Attach this to a GameObject with a Rigidbody to see it in action
using UnityEngine;
public class Example : MonoBehaviour { Rigidbody m_Rigidbody; Vector3 m_ZAxis;
void Start() { m_Rigidbody = GetComponent<Rigidbody>(); //This locks the RigidBody so that it does not move or rotate in the z axis (can be seen in Inspector). m_Rigidbody.constraints = RigidbodyConstraints.FreezePositionZ | RigidbodyConstraints.FreezeRotationZ; //Set up vector for moving the Rigidbody in the z axis m_ZAxis = new Vector3(0, 0, 5); }
void Update() { //Press space to remove the constraints on the RigidBody if (Input.GetKeyDown(KeyCode.Space)) { //Remove all constraints m_Rigidbody.constraints = RigidbodyConstraints.None; }
//Press the right arrow key to move positively in the z axis if the constraints are removed if (Input.GetKeyDown(KeyCode.RightArrow)) { //If the constraints are removed, the Rigidbody moves along the z axis //If the constraints are there, no movement occurs m_Rigidbody.velocity = m_ZAxis; }
//Press the left arrow key to move negatively in the z axis if the constraints are removed if (Input.GetKeyDown(KeyCode.LeftArrow)) { m_Rigidbody.velocity = -m_ZAxis; } } }