Can Java Be Used to Script and Interact with 3D Applications Like Cinema 4D?

Embedding Java in C Applications Using JNI

Embeding Java into C applications provides enhanced functionality and integration with other technologies. In particular, this article addresses a specific scenario where the goal is to embed Java into a 3D application called Cinema 4D.

Integrating Java Classes in C

To achieve the desired functionality, the JNI (Java Native Interface) comes into play. JNI enables communication between Java and non-Java languages, in this case, C . It provides a set of functions and data structures that allow C programs to access Java classes, objects, and methods.

Using JNI, it becomes possible to instantiate Java classes and invoke their methods from within C . This allows for seamless interaction between the C application and the embedded Java code.

Compiling and Evaluating Java Code Dynamically

The question arises whether it's possible to compile and evaluate Java code while the application is running, similar to a scripting language. JNI doesn't offer this capability directly. However, there are third-party libraries that can assist with dynamic compilation and evaluation. One such library is Parrot, which is a Python-like virtual machine with support for running Java bytecode.

With Parrot integrated into the application, Java code can be dynamically compiled and executed at runtime, allowing for the interaction with Cinema 4D objects and operations as desired.

Example Java Code

The example code provided demonstrates how to interact with Cinema 4D using embedded Java:

<code class="java">import c4d.documents.*;

class Main {
  public static void main() {
    BaseDocument doc = GetActiveDocument();
    BaseObject op = doc.GetActiveObject();
    if (op != null) {
      op.Remove();
    }
  }
}</code>

By embedding Java into the C application and utilizing libraries like Parrot, it becomes possible to dynamically execute Java code and leverage the C4D API to interact with the 3D environment of Cinema 4D seamlessly.

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