How to detect slope angle in 2D

Hi everyone,

there are some examples on google and forums but non of them useful.
Please, in my 2D platformer game I want to detect slope angle the player is standing on using ray. I have read that there is a solution to shoot a ray from the player down to the ground and compute at what angle the player is standing on.

I am trying to atchieve different animations of sliding down slopes at different angles. If I am able to measure the angle, then I can slide different slopes with different speed and play different animations.

Please help.

For general scripting help, you should post in the HelpRoom, I’ve moved it for you this time.
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This uses a slightly different method, RaycastNonAlloc which saves a specified number of hit points, in this case, I get the first 2 hits and save them in ‘hits’ that way the first is our characters collider, but the second… oh the second is our beautiful floor collider (hopefully).

void Update(){
	RaycastHit2D[] hits = new RaycastHit2D[2];
	int h = Physics2D.RaycastNonAlloc(transform.position, -Vector2.up, hits); //cast downwards
	if (h > 1) { //if we hit something do stuff

		angle = Mathf.Abs(Mathf.Atan2(hits[1].normal.x, hits[1].normal.y)*Mathf.Rad2Deg); //get angle

		if(angle > 30){
			//DoSomething(); //change your animation


ORIGINAL: (see comments for why it doesn’t work!)

Transform yourCharacter;
float angle;

void Update(){
	RaycastHit2D hit = Physics2D.Raycast(yourCharacter.position, -Vector2.up); //cast downwards
	if (hit.collider != null) { //if we hit something do stuff

		angle = Mathf.Abs(Mathf.Atan2(hit.normal.x, hit.normal.y)*Mathf.Rad2Deg); //get angle

		if(angle > 30){
			DoSomething(); //change your animation

		//you can use hit.normal.x to know which direction to slide in, negative = left, positive = right for standard 2D view