Tests collisions and area detections with StaticBody2D, RigidBody2D, and Area2D.
The Godot documentation states: the collision_layer describes the layers that the object appears in. By default, all bodies are on layer 1. The collision_mask describes what layers the body will scan for collisions. If an object is not in one of the mask layers, the body will ignore it. By default, all bodies scan layer 1.
The numbers above the sprites are the sprite's collision_layer and collision_mask values. For example, a sprite with collision_layer set to 1 and collision_mask set to 0 will have text 1|0 displayed.
In the "Logs: Area vs Area" section, the logs are just slightly overlapped in order to trigger the _on_area_entered signal if applicable. The logs have a more detailed label with format:
name|collision_layer|collision_mask|body/area entered
For example in the screenshot below, log G has label G|0|1|g because it overlaps with log g (note the capitalization). Log G with a mask of 1 scans for all objects on layer 1 and, therefore, detects log g. Note that log g with mask 0 does not scan for any layer and, therefore, does not detect any overlap.
