From e514c27675fa01e5f4f28bee507fd1e7f19d4297 Mon Sep 17 00:00:00 2001
From: Rhys Lloyd <krakow20@gmail.com>
Date: Tue, 25 Nov 2025 08:14:19 -0800
Subject: [PATCH] reduce min dist bit width

---
 engine/physics/src/minimum_difference.rs | 68 +++++++++++++-----------
 1 file changed, 36 insertions(+), 32 deletions(-)

diff --git a/engine/physics/src/minimum_difference.rs b/engine/physics/src/minimum_difference.rs
index dfedb5d7..485e6870 100644
--- a/engine/physics/src/minimum_difference.rs
+++ b/engine/physics/src/minimum_difference.rs
@@ -204,10 +204,8 @@ fn reduce_simplex(
 			// local uDist = uv_up/(u_u*v.magnitude)
 			// local vDist = uv_pv/(v_v*u.magnitude)
 			// local minDist2 = math.min(uDist, vDist)
-			let u_u=u.dot(u);
-			let v_v=v.dot(v);
-			let u_dist=uv_up*(v_v*u.length());
-			let v_dist=uv_pv*(u_u*v.length());
+			let u_dist=uv_up*v.length();
+			let v_dist=uv_pv*u.length();
 
 			// if vDist == minDist2 then
 			if v_dist<u_dist{
@@ -302,32 +300,40 @@ fn reduce_simplex(
 			// local vwDist = pvw*uvwSign/vw.magnitude
 			// local wuDist = upw*uvwSign/wu.magnitude
 			// local minDist3 = math.min(uvDist, vwDist, wuDist)
-			let uv_dist=uv_p.mul_sign(uv_w)*vw.length()*wu.length();
-			let vw_dist=pv_w.mul_sign(uv_w)*wu.length()*uv.length();
-			let wu_dist=up_w.mul_sign(uv_w)*uv.length()*vw.length();
-			let min_dist=uv_dist.min(vw_dist).min(wu_dist);
+			let uv_dist=uv_p.mul_sign(uv_w);
+			let vw_dist=pv_w.mul_sign(uv_w);
+			let wu_dist=up_w.mul_sign(uv_w);
+			let wu_len=wu.length();
+			let uv_len=uv.length();
+			let vw_len=vw.length();
 
-			// if vwDist == minDist3 then
-			if vw_dist==min_dist{
-				(u,v)=(v,w);
-				uv=vw;
-				// uv_p=pv_w; // unused
-				// b0, c0 = c0, d0
-				// b1, c1 = c1, d1
-				simplex.remove(1);
-			// elseif wuDist == minDist3 then
-			}else if wu_dist==min_dist{
-				(u,v)=(w,u);
-				uv=wu;
-				// uv_p=up_w; // unused
-				// b0, c0 = d0, b0
-				// b1, c1 = d1, b1
-				// before [a,b,c,d]
-				simplex[2]=simplex[1];
-				simplex.swap_remove(1);
-				// after [a,d,b]
+			if vw_dist*wu_len<wu_dist*vw_len{
+				// if vwDist == minDist3 then
+				if vw_dist*uv_len<uv_dist*vw_len{
+					(u,v)=(v,w);
+					uv=vw;
+					// uv_p=pv_w; // unused
+					// b0, c0 = c0, d0
+					// b1, c1 = c1, d1
+					simplex.remove(1);
+				}else{
+					simplex.remove(2);
+				}
 			}else{
-				simplex.remove(2);
+				// elseif wuDist == minDist3 then
+				if wu_dist*uv_len<uv_dist*wu_len{
+					(u,v)=(w,u);
+					uv=wu;
+					// uv_p=up_w; // unused
+					// b0, c0 = d0, b0
+					// b1, c1 = d1, b1
+					// before [a,b,c,d]
+					simplex[2]=simplex[1];
+					simplex.swap_remove(1);
+					// after [a,d,b]
+				}else{
+					simplex.remove(2);
+				}
 			}
 
 			// local up = u:Cross(p)
@@ -355,10 +361,8 @@ fn reduce_simplex(
 			// local uDist = uv_up/(u_u*v.magnitude)
 			// local vDist = uv_pv/(v_v*u.magnitude)
 			// local minDist2 = math.min(uDist, vDist)
-			let u_u=u.dot(u);
-			let v_v=v.dot(v);
-			let u_dist=uv_up*(v_v*u.length());
-			let v_dist=uv_pv*(u_u*v.length());
+			let u_dist=uv_up*v.length();
+			let v_dist=uv_pv*u.length();
 
 			// if vDist == minDist2 then
 			if v_dist<u_dist{