Unity3D虚拟现实交互制作（拓展） 第九章 环境设置与交互 3.Interaction in VR.docx

Interaction in VR Overview In VR, we frequently need to activate an object that a user is looking at. For the VRSamples, we have built a simple, extendable, lightweight system allowing users to interact with objects. This consists of three main scripts: VREyeRaycaster, VRInput, and VRInteractiveItem - a short description of these classes is below. The source code is also commented. VREyeRaycaster This script needs to be placed on the Main Camera. Every Update() the script casts a ray forwards using? Physics.Raycast?to see if the ray hits any colliders. This can also exclude certain? layers?- depending on your scene, you may wish to move all interactive objects onto a separate layer for performance reasons. If a collider has been hit by the raycast, this script attempts to find a?VRInteractiveItem?component on the GameObject: VRInteractiveItem interactible = hit.collider.GetComponentVRInteractiveItem(); //attempt to get the VRInteractiveItem on the hit object From this we can determine whether the user is looking at an object, or has stopped looking at an object. If the user has started or stopped looking at an object, we can do something with it, such as call a method. VRInput VRInput is a simple class that determines whether swipes, taps, or double-taps have occurred on the GearVR - or the equivalent controls setup for PC input when using a DK2. You can subscribe to events on?VRInput?directly: public event ActionSwipeDirection OnSwipe; // Called every frame passing in the swipe, including if there is no swipe. public event Action OnClick; // Called when Fire1 is released and its not a double click. public event Action OnDown; // Called when Fire1 is pressed. public event Action OnUp; // Called when Fire1 is released. public event Action OnDoubleClick; // Called when a double click is detected. public event Action OnCancel;