Orientation of Vector3.forward

Questions & Answers
1

I want to use…

Vector3.up;
Vector3.left;
Vecotr3.forward;
...

to translate my camera’s position, but the camera could be facing any direction,

eg.

  (mycamera.directionOfView - defaultStartingDirectionOfView) == differnceFromDefault
  newDirection == differenceFromDefault * Vector3.up;
then
  camera.transform.Translate(newDirection * (velocity), Space.World);

My maths is lacking a bit so I dont have the terminology to properly explain, so feel free to use big maths words I can google later.

2

Vector3.forward
Vector3.right
Vector3.up

are always directions relative to the “world”. They are the same for every object, whichever way they are facing. (Note that there is no Vector3.left - that’s just -Vector3.right).

If you want to know local directions relative to a particular object’s current rotation, use the properties of that object’s transform component:

transform.forward
transform.right 
transform.up