Theta now <= ground angle max.

Author: bryanedds

Nu/Nu/Physics/PhysicsEngine2d.fs

@@ -548,7 +548,7 @@ type [<ReferenceEquality>] PhysicsEngine2d =
         PhysicsEngine2d.getBodyContactNormals bodyId physicsEngine
         |> Array.filter (fun normal ->
             let theta = normal.V2.Dot Vector2.UnitY |> acos |> abs
-            theta < Constants.Physics.GroundAngleMax)
+            theta <= Constants.Physics.GroundAngleMax)
 
     static member private getBodyToGroundContactNormalOpt bodyId physicsEngine =
         match PhysicsEngine2d.getBodyToGroundContactNormals bodyId physicsEngine with

Nu/Nu/Physics/PhysicsEngine3d.fs

@@ -160,7 +160,7 @@ type [<ReferenceEquality>] PhysicsEngine3d =
 
         // track body ground collisions
         let theta = contactNormal.Dot Vector3.UnitY |> acos |> abs
-        if theta < Constants.Physics.GroundAngleMax then
+        if theta <= Constants.Physics.GroundAngleMax then
             match physicsEngine.BodyCollisionsGround.TryGetValue bodyId with
             | (true, collisions) -> collisions.[body2Id] <- contactNormal
             | (false, _) -> physicsEngine.BodyCollisionsGround.[bodyId] <- dictPlus HashIdentity.Structural [(body2Id, contactNormal)]