Collision Resolution

Normally in Unity CharacterController handles both movement and collision resolution. Here the collision resolution is split into a separate system - CollideAndSlideSystem which implements a collide and slide algorithm. This allows the collision resolution to be used with any movement system. For now the algorithm only supports a sphere shape to detect collisions. The system takes the entities' RadiusComponent as the sphere's radius. Collisions are detected against any Unity Collider in the scene. A collider does not need to be present on the entities themselves.

To use it, add the KinematicBodyAuthoring which adds CollideAndSlideComponent. The KinematicBodyAuthoring has the following properties:

• IsActive - Should collisions be resolved.
• SkinWidth - Skin width, small number to avoid floating point inaccuracies.
• LayerMask - The LayerMask to filter Colliders.
• Debug - Draws spheres for debugging different states of the collide and slide algorithm.

note

The entities do not need to have a Collider to detect and resolve collisions, they only need the KinematicBodyAuthoring.

note

The algorithm is based on paper about numerically stable collide and slide algorithm by Jeff Linahan.