transform.rotation interferes with transform.Rotate

Questions & Answers
1

I would like to create a script for a flying player that rotates (turns) the player object along the world Y axis, and rolls (banks) the player along the local Z axis.

I am using the Kinect for motion gesture input, so this script would just control turning & banking left. I’ll copy and modify it for the right sided action. I’ve tried many other more complicated “solutions” I found in forums that haven’t worked. This almost works except for this snag.

Issue: Rotation stops at about -100 degrees. It should continue smoothly through 360 degrees. Also note that both the roll and the rotate work correctly individually, if you comment out the either one or the other.

To test this I created this minimal script…

  • Press S to start object rotation

  • Press and hold horizontal inputs to control object roll

    private Quaternion newRotation;

    void Update () {

     float leanAngle = Input.GetAxis("Horizontal") * 20;	
 			
 if(Input.GetKey ("s")){
 		//Rolls Player
 		newRotation = Quaternion.Euler(transform.rotation.x, transform.rotation.y, leanAngle);
 		transform.rotation = Quaternion.Slerp(transform.rotation, newRotation, Time.deltaTime);
 		
 		//Rotates Player
 		transform.Rotate(-Vector3.up * 2 , Space.World);
 	}
 }

Code (C#)

2

GetAxis returns a value between -1 and 1. Multiple this by 20 , and you will be settings your lean angle to a min/max of -20 to +20 degrees, with this line newRotation = Quaternion.Euler(transform.rotation.x, transform.rotation.y, leanAngle); Though I’m not sure why that line is INSIDE your if statement.

The transform.Rotate(euler_angle_parameter,Space.World) function can thought of as equivalent to:
transform.roation.eulerAngles= transform.rotation.eulerAngles + euler_angle_parameter;
So, using both, the rotate function AND directly assigning rotations can get a bit confusing.

Maybe try something like this (uncompiled- just an example):

Vector3 amount_to_rotate_and_turn= Vector3.zero;
amount_to_rotate_and_turn.z = Input.GetAxis("Horizontal") * 20;  //we will turn this much every frame, so multiplying by 20 might be too fast of a turn
if(Input.GetKey ("s")){
   amount_to_rotate_and_turn.y = 1; //we will turn this much every frame
}
if(Input.GetKey ("a")){
   amount_to_rotate_and_turn.y = -1;//we will turn this much every frame
}
transform.Rotate(amount_to_rotate_and_turn, Space.World);