360 degree movement according to the camera facing

Questions & Answers
1

if(Input.GetKey(“i”)) {
previouskey=“i”;
animation.CrossFade(“moving”);
direction += Vector3.forward;
currentkeydown=true;
}

        if(Input.GetKey("k")){
        	previouskey="k";
            animation.CrossFade("moving"); 
            direction += Vector3.back;
        	currentkeydown=true;
        } 
        			
        if(Input.GetKey("j")){
        	previouskey="j";
        	animation.CrossFade("moving"); 
        	direction += Vector3.left;
        	currentkeydown=true;
        } 
        			
        if(Input.GetKey("l")){
        	previouskey="l";
        	animation.CrossFade("moving"); 
        	direction += Vector3.right;
        	currentkeydown=true;
        } 
    
        //some problem here			
        if(!(direction.x==0&&direction.y==0&&direction.z==0)){
        	transform.localEulerAngles = new Vector3(transform.localEulerAngles.x, Camera.main.transform.localEulerAngles.y, transform.localEulerAngles.z);
        	transform.forward =direction;
        }
        //move the player
        if(currentkeydown){
    	transform.position+=transform.forward*speed;
    }

in the above code, i firstly calculate the vector , direction,which sum up the vector of direction, to set the facing of my character.
it is ok if character can move in 8 direction,
while now i will like to add something which make the character move according to the camera facing.
i have find something like using

transform.localEulerAngles = new Vector3(transform.localEulerAngles.x, Camera.main.transform.localEulerAngles.y, transform.localEulerAngles.z);

but i do not know how to add it to my variable (direction).
can someone give me some advices?

2

There are some tricky situations with reading euler angles directly, but as long as your camera is relatively parallel to the ground, you can replace line 30 - 33 with:

if (direction != Vector3.zero) {
    direction = Quaternion.Euler(0.0f, Camera.main.transform.localEulerAngles.y, 0.0f) * direction;
    transform.rotation = Quaternion.LookRotation(direction);
}