How to detect collisions with specific layers

Vickyboi

I'm making a platformer where there are certain tiles that interact with the player's movement.
Right now, I need to be able to detect collisions with specific layers, since I feel that is the neatest way to do it.
I assigned each layer as a different type of block, and I want an event to trigger when a player lands on one of them.
Thanks in advance.

AzzaamNasir

You'll have to use these settings which are found in your kinematic/rigid/static etc body settings

The layer matrix indicates in what layer the selected body is, while the mask matrix indicates with what other layers the body will detect collisions with
So you just need to have your ground be a layer and then select that layer in the payer's mask matrix
Also do the same in the grounds properties i.e. select the player's layer in the grounds mask property

https://docs.godotengine.org/en/3.2/tutorials/physics/physics_introduction.html#collision-layers-and-masks
This link will be helpful for you

Vickyboi

AzzaamNasir

How do I detect what layer a body collides with with code?
Also, the doc you used is from 3.2, currently I am using 4.2.

soundgnome

Vickyboi In the lower left of the documentation page you can click on the version number to change it to the corresponding page for your version. To check collision layers in code you would use the collision_layer and/or collision_mask properties as explained on that page.

Vickyboi

soundgnome
What lines of code would I need?
I read all of the doc, yet it only mentioned the properties, not how to utilize them.
I tried tweaking the code provided in the doc, but I couldn't formulate a way to detect a collision layer.

func _physics_process(delta):
    var collision_info = move_and_collide(velocity * delta)
    if collision_info:
        var collision_point = collision_info.position

How would I modify this code to make it detect when I collide with a specific layer.
Is there anything else I should be trying?

soundgnome

Vickyboi You can call get_collider on collision_info and then check the collision_layer of the returned object. Something like:

    var collision_info = move_and_collide(velocity * delta)
    if collision_info:
        var collider = collision_info.get_collider()
        collider.collision_layer # etc

Vickyboi

soundgnome
It may be important to mention that I am trying to collide with tilemaps
I tried to print the print(collider.collision_layer), but it returned: Invalid get index 'collision_layer' (on base: 'TileMap').

soundgnome

Vickyboi In that case this approach would probably work:

Vickyboi

soundgnome
Thanks! This video has revealed some very important details to solve the problem.
However, I cannot find how to grab the layer number in a 2d platformer setting, even after some heavy research.
I may have to utilize a different approach for interacting with tilemaps, any suggestions?

Vickyboi

soundgnome
I finally did it! Thank you for sticking with me through this process, I'm sorry for how annoying it might've been. I can finally continue my game!

soundgnome

Vickyboi So in that video he used custom data layers (rather than collision layers) to flag tiles to trigger specific interactions, he shows how to set it up starting at around 2:10.

Vickyboi

@"soundgnome"#p11092

Would this approach work in a 2d side scrolling platformer?
I think I can do it now (hopefully). Just to clarify, I wouldn't need ALL of the code in the terrain detector, just the ones he shows?

soundgnome

Vickyboi Glad you got it worked out! And no need to apologize, I just didn't see your previous reply (looks like something went weird with the "@" and I didn't get a notification).

gigagiant

That video is great, but I still need to get the collision layer, not custom data, so the vid doesn't really solve the problem