Collision grouping

[janfokke]

If my game has some trees and a couple of boundaries then I don't want these to check for collisions on each other.

In the current CollisionComponent, it is not possible to specify this

[lithiumtoast]

Hello @janfokke,

Collisions will definitely need to be revisited all together.

[janfokke]

I already did some performance upgrades and added layers in my own fork
https://github.com/janfokke/MonoGame.Extended/tree/collisionLocal

[kaltinril]

EDIT (Removed my incorrect understanding of the LayerName). Leaving the rest as I believe it's still valid.

Layers collision's are only performed

1. default against default
2. default against N layer (Where "N layer" is a new layer)

Issues:

1. Entities in N layer are never checked against each-other. The only layer that compares entitles inside itself against other entities inside the same layer, is the default layer.
2. Meaning, if you put all Entities in a new Layer, with none in the default, and then add that layer to the CollisionComponent, no collisions will ever take place.

Not sure if this is intended behavior or not, perhaps it would be better to have the user define which layers should collide with which layers.