WorldExpression Class

A WorldExpression script can be implemented as follows:

• As a simple sequence of functions' calls. For example:
  Source code (UnigineScript)

  // get the WorldExpression node
  Node node = getNode();
  // apply transformation to the WorldExpression node
  node.setTransform(rotateX(cos(time * 3.0f) * 2.0f) * rotateY(sin(time * 2.0f) * 4.0f) * rotateZ(sin(time * 1.0f) * 8.0f) * translate(0.0f,0.0f,1.1f));

• As a set of functions and classes. For example:
  Source code (UnigineScript)

  // create resources. This function is called on world load, when not all of the nodes can be loaded					
  void __constructor__() { ... }
  // delete the created resources
  void __destructor__() { ... }
  
  /* 
   */
  
  // implement any required functions
  void print_message() {
  	log.message("Hello from WorlExpression!\n");
  }
   
  // implement a function that the WorldExpression will execute each frame
  void my_update() {
  	...
  	print_message();
  	...
  }
  	       
  // execute the update function
  my_update();

  Notice

  Do not forget to call the function that should be executed each frame in the script.

Each WorldExpression has its own scope. You cannot directly set or get variables to or from the WorldExpression (as memory corruption occurs).

• If a WorldExpression calls a function of a world script:
  Source code (UnigineScript)

  // World script
  namespace WorldScriptScope {
  
  	void worldScriptFunc(string arg) {
  		log.message("World script code: %s\n",arg);
  	}
  }

  Source code (UnigineScript)

  // WorldExpression
  engine.world.call("WorldScriptScope::worldScriptFunc","hello from WorldExpression");

• If a world script calls a function of a WorldExpression:
  Source code (UnigineScript)

  // World script
  namespace WorldScriptScope {
  
  	void worldScriptFunc(WorldExpression expression) {
  		expression.call("worldExpressionFunc","hello from the world script");
  	}
  }

  Source code (UnigineScript)

  // WorldExpression
  void worldExpressionFunc(string arg) {
  	log.message("WorldExpression code: %s\n",arg);
  }

The following internal functions are available within the WorldExpression script:

• Node getNode() - returns the WorldExpression node.
• Node getChild(int num) - returns the WorldExpression child node by its number. If the child is not found, returns NULL.
• int getNumChilds() - returns the number of WorldExpression children.
• Node getParent() - returns the WorldExpression parent node. If there is no parent, returns NULL.

To get the WorldExpression node and its parent, you can write the following in the WorldExpression script:

Node node = getNode();
Node parent = node.getParent();

forloop(int i = 0; getNumChilds()) {
	Node child = getChild(i);
	log.message("The type of the node is: %s\n",child.getTypeName());
}
// this example shows the type of each WorldExpression child