Adding Behaviors to 3D Models
The movie above is scarcely spectacular. If you click on the rotating Box model, the background color of the 3D Models sprite changes, and a message is displayed telling you which face of which mesh has been clicked. Wow.
The big deal is that the code that does this is attached to the Box model itself, in the same way that a behavior is attached to a 2D sprite.
If you thought that you can't attach behaviors directly to models, then you are right. Almost. What you can do is add script instances to the userData list which is a property of every 3D Models node.
Behaviors have four main advantages over the script-instance-in-a-userData-list approach:
- You can drop a behavior directly onto a sprite
- You can set the parameters of the behavior without writing any code
- The built-in spriteNum property allows you to obtain a pointer to the sprite the behavior is attached to
- Director dispatches mouse and keyboard events automatically
You'll see how to work around (or to live with) these limitations in what follows.
Adding a behavior to the userData list
Here's the handler that creates the Box model, and which attaches an instance of the script("Model Instance") to the userData list. As you can see, adding the instance requires only a couple of code. If parameters were required, they could be set in the on new() handler, or in a separate on init() handler if you prefer to work that way. If you are prepared to get your braincells dirty by working in 3D Models Lingo, the loss of drag and drop functionality and the joys of thegetPropertyDescriptionList() handler are not going to upset you.
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