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Q: Why use both Java and C++?

VR Juggler documents refer to the use of Java and C++ together. Why not just make everything Java or everything C++ instead of having a mix? Do I have to use both languages to write an application?

A: The two languages serve different purposes.

In VR Juggler, Java and C++ are used for different purposes. We use C++ for high-performance, natively compiled code capable of delivering the real-time performance needed for VR. Users write their applications in C++ and compile them against the VR Juggler libraries.

We use Java to make cross-platform GUIs that can communicate with the running C++ code. These GUIs may do any number of things. In particular, VR Juggler 1.0 has a tool called VjControl that can be used to do remote runtime reconfiguration of a running VR Juggler application. In VR Juggler 1.0, users do not write any Java code.

VR Juggler 2 will have the next iteration on this tool, VRJConfig. With VRJConfig, users will have the option of writing custom configuration editors in Java. These editors will plug into VRJConfig dynamically.

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