Collission between two copies of an active only when both are on the same layer

[troshinsky]

Hi!

I´m working on a pinball game using the physics objects and it´s going great so far but I run into this problem I can´t figure out:

I am using 4 layers for ramps and such and when there are several balls on the playfield I want them to collide with each other only if they are on the same layer. When I check for a collission between two copies of the ball active, how can I check that they are both on the same layer?

I was trying:

If collission between "ball" and "ball"
Layer of "ball" = Layer of "ball" > Stop "ball"


But of course it does not work. It stops both balls even if they are in different layers.
Any ideas?

Thank you very much!

[Vaxx]

Collisions only work if the objects are on the same layer. It does not work accross multiple layers. So a ball from layer 1 cannot collide with another one on layer 2.

[troshinsky]

Yes they do, when they are physics objects.

See attached:

[Julian82]

The physics engine doesn't respect layers, I don't know if the issue has been reported to the bugbox though. Your method with the additional layer condition probably leads to an issue with object selection. Have your tried a for each loop where the layer of each ball is the entering condition? So you would have four loops for your four layers and only the balls in each specific layer are checked.

edit: my solution is not working, the physics engine does not execute the stopping action when the collision detection is done within a for each loop. Other actions are regulary executed...

[Bipolar_Games]

Just an idea, have you tried using multiple Physics Engine objects on each respective layer, and switching the Engine ID of your objects to whatever layer they are on? Haven't tried this, not sure if it will work or not...

Edit: I guess there's no way to change an object's Engine ID on the fly? You might be able to do this with multiple Movements, one for each Engine ID, and switch the object's Movement to match A) which layer it's on and/or B) which Physics Engine it should be responding to.

[Sparckman]

here is another example:
http://community.clickteam.com/threads/88113-Target-Objects-by-Unique-ID

[troshinsky]

You might be able to do this with multiple Movements, one for each Engine ID, and switch the object's Movement to match A) which layer it's on and/or B) which Physics Engine it should be responding to.

After a quick test this seems to work, but it´s problematic as it would mean I have to reassign every object that balls collide with on each layer to a new engine. The problem with this is that most objects are attached to a "surface" on the first layer, so you can move the whole playfield with everything attached to it. This works very well and it´s actually really important for the game. Having things collide across layers is pretty useful for me, just not for the balls. I would prefer to simply compare the layer value of two colliding objects, which is very easy to do for two different objects, I just don´t know how to do it for two copies of a single one.

[troshinsky]

here is another example:
http://community.clickteam.com/threads/88113-Target-Objects-by-Unique-ID

Yes I am using IDs for every ball but that still doesn´t give me a clue of how to compare that both balls are on the same layer during a collission.

[Perry]

I was having the same problem with 1 of my games.
I had to put them all on the same layer in order to make it work.

[Outcast]

It would be great in general to be able to have an option on objects if they should detect collision on all layers or only on its current layer.