I am slightly confused with the Raycast length and Hit. In my demo the Sphere is always hit when pressing the trigger. ...

I should've mentioned it in the video, but the Ray Length in this case is just used to display the actual raycast in green. So the green ray is actually based off the length value, but the actual raycast is very very long. If you don't specify a length within the Physics.Raycast section it'll cast out a ray as far as it can, hence why it always hits the object. To fix this you'll need to change it to something like this: Physics.Raycast (transform.position, fwd, out hit, rayLength)) the last variable in this case being the length that you want to set for the raycast. If you have the rayLength variable within the DrawRay section it'll also show you exactly how long it is since both sections are using the same variable for the length of the Raycast.

Jonathan Like always thank you for taking the time to answer my questions. This is a great site and I'm trying to soak up everything I can.

Glad I could help!