For (a): sure; you can do anything in Greenfoot that you can do with Java - there's no limitations placed on you by using the Greenfoot framework. For (b) - there may be things that Greenfoot itself doesn't directly support, but in general if the functionality in Greenfoot itself isn't sufficient you can extend it or use your own implementation. (For instance, the collision detection functionality in Greenfoot is very efficient, but assumes objects are rectangular). As for (c), I don't have any experience with NetLogo so can't help you there, sorry. Davin.

Hello davmac, Thanks a lot for your reply! That was very helpful. If you don't mind, I have two quick follow-ups: a) I do not like programming graphics in Java. Does Greenfoot have adequate graphics capabilities to handle a more graphics-intensive simulation? b) Is it possible to program 3D graphics in Greenfoot? Thank you! Zent

Zent, Greenfoot does greatly simplify graphics; each actor has an image (which normally comes from an image file) which can be moved and rotated easily. More complicated graphics can still be done, using the standard Java APIs, if necessary. And although Greenfoot provides no support for 3D graphics, it is still possible to program 3D graphics in Greenfoot. People have done so previously. See this scenario for instance. Maybe I wasn't clear before: anything you can do in Java, you can do with Greenfoot. In some cases it will be easier, but Greenfoot is intended for novice programmers and if you need advanced functionality, you will need to use the regular Java classes and methods. Davin

Hello davmac, That was very clear! Thank you so much! Regards, Zent