14:59 <queqiao-> ⟨pedro4316⟩ what does principia do to calculate craft angular momentum and such

14:59 <queqiao-> ⟨pedro4316⟩ asking cause another game i play has issues with rotating objects loosing angular momentum, its just 2d, but has low hundreds of objects rotating

15:00 <queqiao-> ⟨pedro4316⟩ +and occasionally colliding

17:59 <queqiao-> ⟨Damien⟩ pedro4316 https://github.com/mockingbirdnest/Principia/issues/2519#issuecomment-627612478

20:01 <queqiao-> ⟨sichelgaita⟩ We solve Euler's rotation equations (https://en.wikipedia.org/wiki/Euler%27s_equations_(rigid_body_dynamics)). The good thing is that they have a closed form solution, so they can be solved very efficiently. As indicated in the comment above, this requires to effectively replace PhysX.

20:03 <queqiao-> ⟨sichelgaita⟩ But I would imagine that in 2D the problem would be much simpler, although you'd have to pay attention to the conservation of angular momentum during collisions.

20:12 <_whitenotifier-ee4> [Principia] pleroy closed pull request #3804: A bunch of micro-optimizations in the adapter - https://github.com/mockingbirdnest/Principia/pull/3804

20:18 <queqiao-> ⟨siimav⟩ sichelgaita consider using "Dictionary<K, V>.TryGetValue(key, out var value)" instead doing the hashcode calculation and lookup twice.

20:21 <queqiao-> ⟨sichelgaita⟩ Sounds reasonable, but do you have a particular code fragment in mind, or just a general advice?

20:21 <queqiao-> ⟨siimav⟩ Just in general. I did a quick scrollthrough and noticed this.