Active Key Frame Tutorial By Aziz Khan
Hello every buddy, in this tutorial I will show you the most important part of (Active Rigid Body) and (Passive Rigid Body) called (Set Active Key) and ?(Set Passive Key) these 2 options some time very necessary to work with, allot of people asked me to help them or to write a tutorial about (Active Key) and (Passive Key) that is why I am here to show you how to do it.
For the starting scene you should have some animated objects like robot arm, bulldozer, caterpillar, to act like taking something and to shift it somewhere, so in this tutorial I am going to use robot arm to show you how will work with, if you are new and you don't know how to create this kind objects inside Maya don't worry I will give you the starting scene to work with, so you can download the starting scene from ( Here ).
ok now its time to get started, fire up Maya or if you already running create new scene and then open robot arm if you follow along with me if you have any other object to work with go and open it to start the lesson.
1-When you open the scene robot arm hit play button you are watching that the arm is moving but the can is still in its place in this case we want to arm take the can and through it inside the garbage bin, so you might be thinking how to do that ohhh crazy is that? don't worry its pretty easy, the image below illustrating the first step of of our lesson.

2-Now what we have to do? ok first we will make child under claw, to do this go to (Window>>Hypergraph) and the window will open, from the window just select the (CAN) like in the image below.

3-When you select the (CAN) drag it with middle mouse button and put on the claw it will automatically create child node under claw, as in the picture illustrating below.

4-Ok now hit play and you will see the (CAN) is connected with (Arm) and moving with but one problem is here the arm is not leaving the (CAN) is still connected we want to arm leave the (CAN) in this stage how to do this? in the pictures below.

5-Now we will do something cool here arm should leave the (CAN) after frame 180, come back to frame 1 and select (CAN) and chose (Soft/rigid Bodies>>Create Passive Rigid Body) like the picture below.

6-Hit play you will see nothing happens don't worry, go back to frame 1 and select the (CAN) and then go to (Soft/Rigid Bodies>>Set Passive Key) like in the image illustrating below.

7-If you play still nothing happens still don't worry, ok now scrub your time slider to frame 180 or above and then stop there now go to (Soft/Rigid Bodies>>Set Active Key) as in the picture illustrating down.


