If you want speed and dont want to create another object, I would use the RGB ipo method Toomai mentioned. If you want a perfect outline of the object, either translucent or opaque, you can use this technique: create an object bigger than the object to be highlighted, color it all green, and flip the normals. I can give you a stepbystep tutorial of how to do either technique if you want.
How would I get this “event” to activate? I don’t understand mouse over stuff yet.
select the object you want to get highlighted, then, logic panel (f4), add a new sensor, make it “mouse” type, change it to “mouse over” type. I know thats how you make the sensor but ive never used mouse over so im not sure about all of it.
Also, is there a way to get a controler to work instead of using a mouse and keyboard? This game is going to be for kids so it would help to have a controler they could use.
I just updated to Blender 2.40 and I see a “joystick” type sensor. Dont remember if it was in earlier versions of blender. Anyway, ive never done it but setting up a joystick sensor should be straightforward, im looking at it now and you select from hat, axis, button, select button #, etc.
Good luck, lemme know if you need any instructions on how to do something.