Finding the perimieter of a cave

[Lo-renzo]

@Megalogue1 's suggestion may be the simplest.

Another option is to explore the new 2D Physics API in 2021.2 beta

2D Physics in Unity 2021.2 beta

[7374698--899342--PhysicsCustomCollider2D.png] In Unity 2021.2 we’re introducing two new features for 2D Physics that provide direct access to primitive shapes and unlock additional extensibility possibilities. What’s new? CustomCollider2D A new collider with direct access for creating, updating and deleting actual primitive shapes. It can use any combination of the available primitive shapes that the physics engine understands i.e. Circles, Capsules, Polygons or Edges. As a 2D Collide…

There are some nifty methods for creating and combining shapes. This is a lower-level API so it’s not quite as friendly, but would give you custom control over your colliders.