fix constraints epsilon

these were supposed to be 3 voxels but were on the order of 3 units

engine/physics/src/minimum_difference.rs

@@ -1,6 +1,6 @@
 use strafesnet_common::integer::vec3;
 use strafesnet_common::integer::vec3::Vector3;
-use strafesnet_common::integer::{Fixed,Planar64Vec3};
+use strafesnet_common::integer::{Fixed,Planar64,Planar64Vec3};
 
 use crate::model::{DirectedEdge,FEV,MeshQuery,MinkowskiMesh,MinkowskiVert};
 
@@ -557,7 +557,7 @@ impl ThickPlane{
 		let normal=(p1-p0).cross(p2-p0);
 		// Allow ~ 2*sqrt(3) units of thickness on the plane
 		// This is to account for the variance of two voxels across the longest diagonal
-		let epsilon=normal.length().wrap_3()*3;
+		let epsilon=(normal.length()*(Planar64::EPSILON*3)).wrap_3();
 		Self{point,normal,epsilon}
 	}
 }
@@ -570,7 +570,7 @@ impl Contains for ThickPlane{
 struct ThickLine{
 	point:Planar64Vec3,
 	dir:Planar64Vec3,
-	epsilon:Fixed<2,64>,
+	epsilon:Fixed<4,128>,
 }
 impl ThickLine{
 	fn new(mesh:&MinkowskiMesh,[v0,v1]:Simplex<2>)->Self{
@@ -580,7 +580,7 @@ impl ThickLine{
 		let dir=p1-p0;
 		// Allow ~ 2*sqrt(3) units of thickness on the plane
 		// This is to account for the variance of two voxels across the longest diagonal
-		let epsilon=dir.length_squared()*3;
+		let epsilon=(dir.length_squared()*(Planar64::EPSILON*3)).widen_4();
 		Self{point,dir,epsilon}
 	}
 }