appsinacup/godot-rapier-physics

Area2D doesn't respect collision layers

Closed this issue · 1 comments

tvenclovas96 commented

Area2D node detects physics bodies on any collision layer, regardless of collision mask

To Reproduce
Steps to reproduce the behavior:

  1. Overlap an Area2D with any physics body with the Area2D collision mask and the physics collisions layer being mutually exclusive.

Output using Godot default physics:
default

Same scene with Rapier:
rapier

Godot v4.3.beta1 - Windows 10.0.19045 - Vulkan (Mobile) - dedicated NVIDIA GeForce RTX 3080 (NVIDIA; 31.0.15.4601) - AMD Ryzen 5 5600X 6-Core Processor (12 Threads)

  • SIMD and non-SIMD

rapiermrp.zip

Ughuuu commented

Investigated this, and rapier doesn't as of now support the exact same kind of filtering that godot supports. Will document this better, and see if i'll open a bug or ask for a request on rapier side to see if this can be improved.
As per their documentation, they do:
https://rapier.rs/docs/user_guides/javascript/colliders/#collision-groups-and-solver-groups

if body A is in layer that B mask looks for and B is in layer that A mask looks for, it's collision, if not it's not. They don't support asymetric collisions. Or at least not sure right now about it.

Leaving this answer here, documenting it as a limitation and closing this issue for now.