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Question by zerker470 · Mar 04, 2011 at 03:09 AM · collisioncollisionsone

Passable one sided collision platforms

What I'm trying to do is quite literally the same as seen in the game Super Mario 3. See Image: http://www.videogamecritic.net/images/nes/super_mario_bros__3.jpg

I'm currently using the character controller for the collision object of our player. What I would like to know is how to best go about creating platforms that are passable on all sides but you can land on top of them.

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Answer by Jessy · Mar 04, 2011 at 01:53 PM

The easiest way to replicate that in Unity would be to use mesh colliders. That is, put quads at the top of the boxes; you don't need renderers on these quads, necessarily. You could do it like Smash Bros., where the characters phase through the bottoms of platforms like Shadowcat, but can stand on top. Mesh colliders only cause collisions to happen in the direction they face, so point the faces up.

And if you stand on the w$$anonymous$$te one, and hold the "down" key for a little w$$anonymous$$le, turn the mesh collider into a trigger for a frame. ;-)

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Answer by kashif619 · Sep 01, 2017 at 12:10 AM

Just use Unity's PlatformEffector2D Component

https://docs.unity3d.com/Manual/class-PlatformEffector2D.html

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Answer by Hrusilov · Oct 03, 2016 at 02:05 PM

T$$anonymous$$s helped me. On the top of the platform I've put a reguler 2D collider and underneath a trigger collider. Then I've put t$$anonymous$$s script on the platform object using UnityEngine; using System.Collections.Generic;

 public class BottomPassObject : MonoBehaviour {
 
     private List<Collider2D> colliders = new List<Collider2D>();
     private Collider2D bottomTrigger;
     private int enterCount = 0;
 
     void Start () {
         foreach(Collider2D col in t$$anonymous$$s.GetComponents<Collider2D>()) {
             if (col.isTrigger)
                 bottomTrigger = col;
             else
                 colliders.Add(col);
         }
     }
 
     void OnTriggerEnter2D(Collider2D other) {
         if (other.tag.Equals("character")) {
             t$$anonymous$$s.enterCount++;
             foreach (Collider2D col in t$$anonymous$$s.colliders)
                 col.enabled = false;
         }
     }
 
     void OnTriggerExit2D(Collider2D other) {
         if (other.tag.Equals("character")) {
             t$$anonymous$$s.enterCount--;
             if (t$$anonymous$$s.enterCount == 0) {
                 foreach (Collider2D col in t$$anonymous$$s.colliders)
                     col.enabled = true;
             }
         }
     }
 }

Explanation: - That character tag check is because my character (for other reasons) has another c$$anonymous$$ld object with collider that I need to be ignored. - the list of colliders is because some of my platforms have more colliders - The enterCount is because my character also has more colliders on $$anonymous$$m

Hope t$$anonymous$$s helps

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avatar image tanoshimi · Oct 03, 2016 at 03:03 PM 0
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Couldn't you just use the built-in platform effector?

avatar image Hrusilov tanoshimi · Oct 03, 2016 at 07:19 PM 0
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I experienced some weird behavior due to the more colliders on my character so I made this script. I might have used the platform effector incorrectly but whatever combination of the properties I tried did not work the way I wanted.

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