anchor.diff:                      { Extent = block'.Size * 0.5f
                         Properties =
                           { Center = Vector2.Zero
  -                          Friction = 0.0f
  +                          Friction = 0.2f
                             Restitution = 0.0f
                             FixedRotation = false
                             LinearDamping = 5.0f
  
positive.code:                           Radius = character'.Radius
                            Properties =
                              { Center = Vector2.Zero
                                Friction = 0.0f
                                Restitution = 0.0f
                                FixedRotation = true
                                LinearDamping = character'.LinearDamping
  
negative.code:             let physicsId = Physics.getId tm.Id
              let shapeProperties =
                  { Center = Vector2.Zero
                    Friction = 0.2f
                    Restitution = 0.0f
                    FixedRotation = true
                    LinearDamping = 0.0f
  