From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 25 Nov 2022 19:38:09 +0000 (+0200)
Subject: Don't apply more friction than it takes to nullify the velocity
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=15afb5af144074d127cfaab7e2df769a561c1448;p=libs%2Fgame.git

Don't apply more friction than it takes to nullify the velocity
---

diff --git a/examples/bassteroids/source/physics.cpp b/examples/bassteroids/source/physics.cpp
index 2453fd9..21c8bd4 100644
--- a/examples/bassteroids/source/physics.cpp
+++ b/examples/bassteroids/source/physics.cpp
@@ -191,7 +191,7 @@ void Physics::apply_impulses()
 		float friction_coeff = 0.1f;
 		float inv_mass_sum = entity1.inverse_mass+entity2.inverse_mass;
 		float reaction = (1+restitution)*inner_product(v_rel, c.normal)/inv_mass_sum;
-		float friction = reaction*friction_coeff;
+		float friction = min(reaction*friction_coeff, v_tan/inv_mass_sum);
 		LinAl::Vector<float, 2> impulse = c.normal*reaction+tangent*friction;
 		entity1.velocity += impulse*entity1.inverse_mass;
 		entity2.velocity -= impulse*entity2.inverse_momi;