2
If you have an object whose transform is already rotated the way you want on the z axis (and not rotated on the x and y), then this is as simple as:
Vector2 direction = -transform.up;
Otherwise, you can construct the rotation you want and rotate the "down" vector by it:
Vector2 RotationToVector(float degrees) {
Quaternion rotation = ...
1
If your object always remains upright (green vector always points up), then this is as simple as zeroing out the y component of your target direction.
Vector3 targetDirection = targetToRotateTo.position - transform.position;
targetDirection.y = 0f;
if (targetDirection != Vector3.zero) {
float singleStep = rotationSpeed * Time.deltaTime;
transform....
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