using UnityEngine; using UnityEditor; [InitializeOnLoad] class PhysicsSettler { static bool registered = false; static bool active = false; static Rigidbody[] workList; static bool cachedAutoSimulation; const float timeToSettle = 10f; static float activeTime = 0f; static PhysicsSettler() { if (!registered) { EditorApplication.update += Update; SceneView.onSceneGUIDelegate += OnSceneGUI; registered = true; } } [MenuItem("GameMenu/Settle Physics")] static void Activate() { if( !active ) { active = true; workList = Object.FindObjectsOfType<Rigidbody>(); cachedAutoSimulation = Physics.autoSimulation; activeTime = 0f; foreach( Rigidbody body in workList ) { body.WakeUp(); } } } [MenuItem("GameMenu/Settle Physics", true)] static bool checkMenu() { return !active; } static void Update() { if( active ) { activeTime += Time.deltaTime; Physics.autoSimulation = false; bool allSleeping = true; foreach( Rigidbody body in workList ) { if( body != null ) { allSleeping &= body.IsSleeping(); } } if( allSleeping || activeTime >= timeToSettle) { Physics.autoSimulation = cachedAutoSimulation; active = false; } else { Physics.Simulate(Time.deltaTime); } } } static void OnSceneGUI(SceneView sceneView) { if( active ) { Handles.BeginGUI(); Color cacheColor = GUI.color; GUI.color = Color.red; GUILayout.Label("Simulating Physics.", GUI.skin.box, GUILayout.Width(200)); GUILayout.Label(string.Format("Time Remaining: {0:F2}",(timeToSettle - activeTime)), GUI.skin.box, GUILayout.Width(200)); Handles.EndGUI(); foreach( Rigidbody body in workList ) { if( body != null ) { bool isSleeping = body.IsSleeping(); if( !isSleeping ) { GUI.color = Color.green; Handles.Label(body.transform.position, "SIMULATING"); } } } GUI.color = cacheColor; } } }

当了解了何时和为何使用网格、顶点吸附、碰撞吸附时，我们将在关卡设计工作流程获得更好的开发体验。推荐开发者们多多尝试这些工具，例如：对比轴心(Pivot)和中心(Center)模式的区别，或是比较全局(Global)和局部(Local)模式的不同，这样就可以知道什么模式更为适合。花费在布置虚拟对象的时间越少，那么在开发时得到的乐趣就越多。