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Question by ChrisIsAwesome · Nov 07, 2018 at 02:22 AM · c#collision2d

How to know what side of platform the player touches?

So I've done research on this and there's a couple ways to do this: Through normal collision using the contact point and collider's center, then there's raycasting.

I've tried the collision method but it doesn't account for the intersection of the platform tiles.

To be specific, each platform is a prefab that is painted in scene using tilemap prefab brush. Each prefab has a BoxCollider2D attached. The collisions trigger as normal except if you're directly at where the two platforms meet, you will be seen as being to the side of both platforms, even if you're on top or below them.

What I'm trying to do is to set the tag of the platform either floor, wall, or ceiling, depending on which side the player collides with.

My script (attached to platforms):

 private void OnCollisionEnter2D (Collision2D otherCollider)
 {
     Collider2D thisCollider = otherCollider.collider; // This collider

     // If collision with player
     if (otherCollider.gameObject.tag == "Player")
     {
         Vector3 contactPoint = otherCollider.contacts[0].point; // Point at which other collider intersects with this collider
         Vector3 center = thisCollider.bounds.center; // Center point of this collider to use as reference for where player is in relation to this point

         // If player is to side of platform
         if (contactPoint.x > center.x || contactPoint.x < center.x)
         {
             // Set tag
             this.tag = "Wall";
         }
         // Else if player is not to side of platform
         else
         {
             ///If player is above platform
             if (contactPoint.y < center.y)
             {
                 // Set tag
                 this.tag = "Floor";
             }
             // Else if player is below platform
             else
             {
                 // Set tag
                 this.tag = "Ceiling";
             }
         }
     }
 }

Any help would be greatly appreciated!

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