Moving a game object along a 2d vector by knowing the Rotation in degrees (Unity)

Question

I am hoping one of you fine fellows can help me again. Basically I have been making a game like Asteroids in Unity. But its in a 3d world space (pretty much not relevant except I am using X and Z axes, and the rotation angle is on the Y axis).

When the user presses "W" this adds some power towards the thrust. It also records the objects current rotation in transform.eulerAngles. (i've verified that the angle of y is correct. So a value of 90 is showing when my ship is facing right).

I have used Mathf.Cos/Sin and that angle value to move the object along X,Z axes.

But for some reason it isnt moving in the same direction as it should. -I tried it with some offsets like thrustAngle - 45 (or 90 etc) and it doesnt adjust it as expected. (reducing it be 45 seems to have a bigger impact than expected for example).

Here is the lines of code, have I got the Cos Sin part incorrect?

    void HandleInput(){
    // activate weapon
    if (Input.GetKey(KeyCode.Space))
    {
        FireWeapon();
    }
    // Rotate left
    if (Input.GetKey(KeyCode.A))
    {
        transform.Rotate(0, -rotationSpeed * Time.deltaTime, 0);
    }
    // Rotate right
    if (Input.GetKey(KeyCode.D))
    {
        transform.Rotate(0, rotationSpeed * Time.deltaTime, 0);
    }
    // activate thrusters
    if (Input.GetKey(KeyCode.W))
    {
        thrustAngle = transform.eulerAngles.y -90;
        if (currentThrust < maxThrust)
        {
            currentThrust += accel;
        }
    }
    else
    {
        if (currentThrust > 0f)
        {
            currentThrust -= thrustDecay;
        }
    }
    if (Input.GetKey(KeyCode.S))
    {
        if (currentThrust > 0)
        {
            currentThrust -= decelThrust;
        }
    }

    transform.position += new Vector3(Mathf.Cos(thrustAngle), 0, Mathf.Sin(thrustAngle)) * currentThrust * Time.deltaTime;
    Debug.Log("angle: " + thrustAngle);



    if (currentThrust < 0f)
    {
        currentThrust = 0f;
    }

}

Answer 1

Ok Ive fixed although I am puzzled as I thought that Cos was for the X axis. But I had two things incorrect: 1. I needed the angle to be in rads not degrees. 2. I had Cos and Sin the wrong way around.

Here is the code that got it working perfectly for me. (Sorry if I wasted anyones time)

        transform.position += new Vector3(Mathf.Sin(thrustAngle * Mathf.Deg2Rad), 0, Mathf.Cos(thrustAngle * Mathf.Deg2Rad)) * currentThrust * Time.deltaTime;