i want to ask a question about the car game tutorial part 1 made by unity which is:- it says use the track thingy....how do i put it in the scene when i double click it some objects appear in the hierarchy part but nothing appears on the scene view its just blank please answer me :D...send to my email-hisham.kandil@hotmail.com or answer here which ever u want
Haven't done the tutorial, so don't know exactly what you're talking about, but it seems pretty simple.
If it's a prefab - drag it from the "Project" tab to the "Scene" tab.
If after double clicking it you get other objects in the hierarchy tab - it's probably a scene. Does it have a Unity Logo on it?
After double clicking it, select one of the objects in the hierarchy tab, click the scene view and hit F on your keyboard (or go to Edit->Frame Selected from the menus). It should move the object to the view.
Try doing some basic Unity tutorials and go over the User Manual to grasp these things better before jumping to multiplayer racing games :) Try these: http://unity3d.com/support/documentation/video/