From 5ba99835949c0681ce514262a45109092b7958f2 Mon Sep 17 00:00:00 2001
From: ecker <mrq@ecker.tech>
Date: Wed, 19 Aug 2026 20:18:45 -0500
Subject: [PATCH] also migrate frame accumulator to world state instead of it
 being a static variable in some weird timeline i have multiple physics sims
 running at once

---
 engine/inc/uf/utils/math/physics/structs.h |  1 +
 engine/src/utils/math/physics/impl.cpp     | 10 +++-------
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/engine/inc/uf/utils/math/physics/structs.h b/engine/inc/uf/utils/math/physics/structs.h
index 21dd8688..ef26a35a 100644
--- a/engine/inc/uf/utils/math/physics/structs.h
+++ b/engine/inc/uf/utils/math/physics/structs.h
@@ -469,6 +469,7 @@ namespace pod {
 		uf::stl::vector<pod::PhysicsBody*> bodies;
 		uf::stl::vector<pod::Constraint*> constraints;
 	
+		float timeAccumulator = 0.0f;
 		pod::Vector3f gravity = { 0, -9.81f, 0 };
 		pod::BVH dynamicBvh;
 		pod::BVH staticBvh;
diff --git a/engine/src/utils/math/physics/impl.cpp b/engine/src/utils/math/physics/impl.cpp
index b55635f1..6fcfc9dd 100644
--- a/engine/src/utils/math/physics/impl.cpp
+++ b/engine/src/utils/math/physics/impl.cpp
@@ -68,17 +68,13 @@ void uf::physics::tick( pod::World& world, float dt ) {
 
 		return;
 	}
-
 	UF_PHYSICS_TIMER_MULTITRACE_START("Tick Step Begin");
-	static float accumulator = 0;
-	accumulator += dt; 
-
 	float timestep = uf::physics::settings.timestep;
-
-	while ( accumulator >= timestep ) { 
+	world.timeAccumulator += dt; 
+	while ( world.timeAccumulator >= timestep ) { 
 		if ( uf::physics::settings.substeps > 0 ) uf::physics::substep( world, timestep, uf::physics::settings.substeps ); 
 		else uf::physics::step( world, timestep ); 
-		accumulator -= timestep; 
+		world.timeAccumulator -= timestep; 
 		UF_PHYSICS_TIMER_MULTITRACE("Tick Accumulation Step");
 	}
 	UF_PHYSICS_TIMER_MULTITRACE_END("Tick Step Complete");