Methods of vector operation and coordinate transformation

Transform.InverseTransformPoint
get position Local coordinates of , position Is a world coordinate point
At last get position Relative coordinates in local coordinates
give an example ： Such as transform.positon = (1,0,0) 
Then the following is to obtain the world coordinates (2,0,0) Relative to local location (1,0,0) The coordinates of are (1,0,0)
Debug.Log(transform.InverseTransformPoint(2, 0, 0));


Transform.TransformPoint
get position The world coordinates of
position It is based on the relative coordinates of the local coordinates of the current object ( Displacement )
give an example ： Such as transform.positon = (1,0,0) Then the following result should be (3,0,0)
Debug.Log(transform.TransformPoint(2, 0, 0));


Transform.InverseTransformDirection
obtain direction Direction vector in local coordinates ,direction It was originally a direction vector in the world coordinate system
Will only be affected by objects rotation Affected by
If the object is x Shaft rotation 90 Deg. , Then the up (0,1,0) For the local -forward (0,0,-1)
Debug.Log(transform.InverseTransformDirection(Vector3.up));


Transform.TransformDirection
obtain direction The world coordinates of
If the object is x Shaft rotation 90 Deg. , Then it's up Is... In the world coordinates forward
Debug.Log(transform.TransformDirection(Vector3.up));