Change in EdgeCollider2D behavior, 4.6 -> 5

I've noticed a change in EdgeCollider2D's interaction with dynamic objects (at least with BoxCollider2D and PolygonCollider2D).

I have a simple 2D tiled platformer, with blocks made up of EdgeCollider2Ds with five vertices each, essentially creating squares out of four edges. The player is a simple BoxCollider2D (and I've also tried translating it into a PolygonCollider2D with the same shape). Continuous collision detection is turned on (although I used Discrete in 4.6, and I've tried Discrete in 5).

In 4.6 I had no issues running around on blocks or landing on blocks or whatever. At the very least, I can confirm that what I'm about to describe is not reproducible in 4.6.

Since upgrading to 5, I sometimes fall through blocks. It's not entirely consistent when just running along the top of a row of blocks, but if I jump and land just on the edge of a lone block, like JUST inside the square, I'll fall through the block and then can move through it to the other side. Once I'm through I can't go back in. The vertices go in order of lower left, upper left, upper right, lower right, lower left. It's fairly straightforward.

So it's something about falling or walking just inside the edge. And sometimes when I fall through I just get stuck inside the block, with the physics engine not allowing me to exit in any direction, bouncing me back and forth and up and down.

Either I was using EdgeCollider2Ds incorrectly before or Unity 5 has introduced a bug or Unity 5 treats them differently. Whatever the case, has anyone else seen this? Or does anyone have a solution or alternative way of doing what I want to do?

Also maybe worth noting is that I'm working with fairly small values, I think? Small enough that the physics "skin" around the box is noticeably large. Like, my player BoxCollider2D is 0.09x0.21. The boxes are 0.16x0.16. Maybe that has something to do with it?

 

I've torn down my project to the bare essentials so that you can easily reproduce it without any extraneous game objects or scripts or sound effects or anything!

Here it is uploaded on the web: http://www.twigbits.com/wp-content/uploads/brokeunity/brokeedgecolliders/Web Build.html

Here it is in easily downloadable zip format: http://www.twigbits.com/wp-content/uploads/brokeunity/brokeedgecolliders/brokeedgecolliders.zip

 

maybe make a physic material to the colliders as sticky ,slippery or bouncy. on your project i presume sticky is good
Friction 1
bounciness 0

 

Yep, continuous collision detection is on. In 4.6 I actually used discrete and it was fine, but I made sure to turn on continuous just in case, and it didn't help. ):

The reason I don't use BoxCollider2D is because a bunch of those tiles lined up will catch the player on the corners. And I've tried solving that issue by using a round player bottom, but then the player hops a little sometimes as he's running around. EdgeCollider2D was the only solution in 4.6.

That said, I did "solve" the problem by adding a BoxCollider2D as well, and just made it slightly smaller than it should be, so that if the player object does somehow fall into the Edge-box, it'll be subsequently pushed out, and I manage to avoid the sticking/hopping problem when running along a row of tiles. It's... not a great solution, but it's one I'm willing to live with.

(The best solution would probably be to generate a single PolygonCollider2D for all connected tiles, but that's math I haven't really attempted wrapping my head around, as I mostly just want to make a silly little platformer!)

I'll look into the isTouching, as well, thanks.

Thank you for the response!

 

Oh I guess I should point out that I generate the edge boxes dynamically from a Tiled (level editor) file, which is why I don't just build the polygon collider by hand.

 

I think I just posted a "duplicate" here as I am experiencing the same as you.
I am also using edge colliders cause I dinamycally build a tilemap.

 

I got a response to my bug report that they're aware of it, so hopefully it'll be fixed soon!

 

Is normal to have bugs with such a big product, but I believe the issue tracker with the upvote system is a great idea to prioritize them.
Thanks for informing. You are doing a great job with Unity!

 

Oh, that would be cool if fixed. My character was suddenly falling through some of the platforms...I couldn't get a hand on the changes I Made and what could give this problem..Seems to be this bug I quess

 

I still have the problem that some elements pass through the edge collider and get stuck in it.
I have an edge collider and a circle collider. The circle collider with rigidbody2d falls down on the edge collider with a rigidbody2d and sometimes the circle collider is "merged" with the edge collider gameobject and so it rotates....

Using Unity 5.0.0p3 on Windows and tested this on a Nexus 4 with Android 5.0

Haven't experienced this issue with Unity 5.0.0 official release version.