Simulating ragdolls

Please make sure the agent type you are going to use has a ragdoll file as described here.

Create a new scene and follow these steps:

Create an agent group and set its display type to skin.
Add a grid layout module.
Create a plane, scale it by 500 on all axis and add it as an height field with the height field manager .
Duplicate the plane and set the duplicated plane Y value to -1
With the duplicated plane selected, click on the shelf button for creating a rigid body (AtomsPhysx shelf)
Set the rigid body mesh type to plane
Select the agent group again.
Add a state machine module.
Set the height field of the state machine to the height field you just created.
Select the tcAtomsSolver (you will find a tab in the attribute editor when having any agent group selected), enable Physx , set the scale to 100 and the sub samples to 15.
Add a ragdoll module to the agent group.
Set the mode of the ragdoll module to "3 - ragdoll" and press play.
You will see your agent falling on the floor.

Let's keep working on this scene:

Set the State Machine module state to 1.
Change the ragdoll module mode value to "2 - kinematic"
Set a key frame on the mode field at frame 1, by right clicking on the drop down menu and clicking "set key".
Set another frame at frame 10, then move to frame 11 and set a keyframe with value "3-ragdoll".
Press play.
You will see the agent walking for 10 frames and then falling down.

Rewind the animation.
Right click again on the mode field of the ragdoll module and click on "Break connections" (the mode should be set to 2-kinematic)
Create a plane, scale it by 200 and move it <150, 70, 0>.
Select the atoms group and add an area trigger module.
Set the plane as mesh for the area trigger module, then set the metadata name to "dynamicMode" and the field "Int Value" to 3.
Select the ragdoll module and turn on the "useDynamicModeMetadata" option.
Press play.
You will see the agent walking and then falling down as soon as it enters the areaTrigger plane.

Please feel free to expirement a bit more, by playing with the ragdoll module options and by adding more agents to your simulation.