Collision models are colliders that define the invisible shape of an object for physical collisions and work as an obstacle. There are three variations of such models in the standard object package:

  1. Spherical
  2. Capsule
  3. Cubic

Settings in the inspectorLink to Settings in the inspector

Only one parameter is defined for these objects, allowing you to turn off or on their only function, obstacle

UsageLink to Usage

All collision models have only functional use, they are not displayed in view mode. The functional use is that if for some reason an object in the library has no physical colliders (or they are too small and you need to enlarge them), you can create one yourself by adding one of the appropriate models to the child position of an object without colliders (in our case, the shield has colliders, but they are too small for our case)

Let's take a visual look at how the shield with its own colliders will fall down

As can be seen, the shield falls and hits the base cone against the floor, hitting its native collider. Now let us consider an example when the shield has a cubic collision model in the hierarchy

The shield falls, but it doesn't touch the ground, and uses the collider cubic collision model collider as the lower boundary of the collider

The behaviors of all three objects are identical, you can use one or another model depending on your needs and design requirements