What is Ragdoll physics and how to create it?

Create our Ragdoll in Unity

1. Import a 3D character, for the sample case, I just build it with several base geometries.

2. Properly assign colliders to each body part; You may use Window -> Analysis -> Physics Debugger to view the composited collider.

3. In its core joints (e.g. Hip; Head; Shoulders/Legs), add the configurable joint component, a rigidbody component should be automatically added with it.

4. Connect body parts by properly assigning their Connected Body (e.g. hand -> elbow -> shoulder -> spine -> hip). Note: The HIP should be the center of the body, and the other main parts should finally connect to the hip, while the hip itself does not need to connect to others.

In the example case, just simply connect all parts to the hip.

5. For all joints, we lock their XYZ motion (prevent body part from splitting), and set the Position Spring of the Angular XYZ drive to 200 (assign the spring to make the ragdoll stand up, a larger drive is required for a larger mass of the ragdoll).

6. The hip is generally the center of a ragdoll, hence we want this part to connect to all other parts and be the power source: We unlock the XYZ motion of the hip.

8. Run the game, and drag the father node of the ragdoll to check your result!

Aside: Use ragdoll to generate death effect of the character

Aside: Generate animation based on ragdoll