Detecting missing collision in 2D platformer to change direction for enemy - without Raycast

Question

I can not use Raycast, because I have a WebGL Build, with which Raycasts don't work well. Now I want enemies to change their moving direction, when they reach the end of a platform.

How I did it with Raycast (the enemy has a Game Object on its front downside and when it doesn't have contact to a collider, it changes its direction):

         if (!Physics2D.Raycast(down_Collision.position, Vector2.down, 0.1f))
         {
                 moveLeft = !moveLeft;
 
                 Vector3 tempScale = transform.localScale;
 
                 if (moveLeft)
                 {
                     //SNAIL LOOKS TO THE LEFT
                     tempScale.x = Mathf.Abs(tempScale.x);
                 }
                 else
                 {
                     tempScale.x = -Mathf.Abs(tempScale.x);
                 }
 
                 //new sprite-orientation
                 transform.localScale = tempScale;
         }

Now, since Raycast isn't working anymore, is there another easy to use option? Physics2D.OverlapCircle work fine for top collision, but I didn't found out a way to detect collision to the ground.

Answer 1

Answer by Anonymous620 · Jul 06 at 02:04 PM

I know this is old but you could try this: 1. Add an empty gameobject as a child of the player and position it where you had your RayCast. 2. Add a box collider to it 3. Make the collider a trigger 4. Add this script to the gameobject

 Public Transform player;
 
 void OnTriggerExit2D(){
         //change direction
 }

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Detecting missing collision in 2D platformer to change direction for enemy - without Raycast

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