VRPN 客户端插件

Virtual Reality Peripheral Network (VRPN) is a device-independent system for accessing virtual reality peripherals in VR applications. The VRPN system consists of programming interfaces for both the client application and the hardware drivers and a server application that communicates with the hardware devices. The DTrack application often goes as a server application.Virtual Reality Peripheral Network (VRPN) 是一个独立于设备的系统，用于访问 VR 应用程序中的虚拟现实外围设备。 VRPN 系统由客户端应用程序和硬件驱动程序的编程接口以及与硬件设备通信的服务器应用程序组成。 DTrack 应用程序通常用作服务器应用程序。

The Virtual Reality Peripheral Network (VRPN) plugin represents the client application which is connected to the server and used for receiving input data from different input devices (joysticks, 3D motion and orientation tracking sensors and so on) via the Network.Virtual Reality Peripheral Network (VRPN) 插件代表客户端应用程序，它连接到服务器并用于通过网络从不同的输入设备（操纵杆、3D 运动和方向跟踪传感器等）接收输入数据。

For example, by using the VRPN Client plugin, you can implement an application that processes input data from ART controls.例如，通过使用 VRPN Client 插件，您可以实现处理来自 ART 控件的输入数据的应用程序。

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注意

Before launching the plugin, you should run a server application (it is usually DTrack) that receives input data from an input device. The VRPN Client plugin will connect to this server and receive data from it.在启动插件之前，您应该运行一个从输入设备接收输入数据的服务器应用程序（通常是 DTrack）。 VRPN Client 插件将连接到该服务器并从中接收数据。

To use the VRPN Client plugin, you should specify the extern_plugin command line option on the application start-up:要使用 VRPN Client 插件，您应该在应用程序启动时指定 extern_plugin 命令行选项：

main_x64 -extern_plugin "VrpnClient"

When the VRPN Client plugin is loaded, the following classes are added to UnigineScript:加载 VRPN Client 插件后，以下类将添加到 UnigineScript：

• VrpnAnalogDevice that receives data about input devices sticks.VrpnAnalogDevice 接收有关输入设备棒的数据。
• VrpnButtonDevice that receives data about input devices buttons states.VrpnButtonDevice 接收有关输入设备按钮状态的数据。
• VrpnTrackerDevice that receives about position, orientation, velocity and acceleration of tracked objects from 3D tracking sensors.VrpnTrackerDevice 从 3D 跟踪传感器接收有关被跟踪对象的位置、方向、速度和加速度。

注意

Each class can be instanced more than once.每个类可以被多次实例化。

When implementing an application using the plugin, instances of the classes listed above should be created on engine initialization.使用插件实现应用程序时，应在引擎初始化时创建上面列出的类的实例。

注意

The server address and the device name should be passed to constructors of the UnigineScript classes (VrpnAnalogDevice, VrpnButtonDevice, VrpnTrackerDevice) as follows: device_name@server_address.服务器地址和设备名称应传递给 UnigineScript 类 (VrpnAnalogDevice, VrpnButtonDevice, VrpnTrackerDevice) 的构造函数，如下所示：device_name@server_address。

For example, if the VRPN server is set on the PC via the DTrack application, the following should be passed: DTrack@localhost. If the server is set on another PC, instead of the localhost, you should specify the PC's IP address. You should also call the update() method for each initialized device on engine update.For example, if the VRPN server is set on the PC via the DTrack application, the following should be passed: DTrack@localhost. If the server is set on another PC, instead of the localhost, you should specify the PC's IP address. You should also call the update() method for each initialized device on engine update.For example, if the VRPN server is set on the PC via the DTrack application, the following should be passed: DTrack@localhost. If the server is set on another PC, instead of the localhost, you should specify the PC's IP address. You should also call the Update() method for each initialized device on engine update.例如，如果通过 DTrack 应用程序在 PC 上设置 VRPN 服务器，则应传递以下内容：DTrack@localhost。如果服务器设置在另一台 PC 上，而不是 localhost，您应该指定 PC 的 IP 地址。您还应该在引擎更新时为每个初始化的设备调用 update() 方法。

#ifdef HAS_VRPN_CLIENT

VrpnTrackerDevice tracker;
VrpnButtonDevice button;
VrpnAnalogDevice analog;

int init() {
	
	tracker = new VrpnTrackerDevice("DTrack@localhost");
	button = new VrpnButtonDevice("DTrack@localhost");
	analog = new VrpnAnalogDevice("DTrack@localhost");
	
	return 1;
}

int shutdown() {

	delete tracker;
	delete button;
	delete analog;
	
	return 1;
}

int update() {
	
	tracker.update();
	button.update();
	analog.update();
	
	return 1;
}

#else

int init() {
	log.warning("No VRPN Client plugin detected\n");
	return 1;
}

int shutdown() {
	return 1;
}

#endif