How to make some collisionshape2d's not collide?

Question

For my staticbody I have 2 collisionshape2d and when I instance the scene at the same place it causes lag because having to many collisionshape2ds in 1 place leads to a lot of collision pairs. Having 150 instances leads to 45000 collision pairs and the fps decreases to single digits. How can I make the Collisionshape2d 1 and Collisionshape2d 2 not collide which will decrease the number of collision pairs by a lot.

Staticbody
-Sprite
-Collisionshape2d 1
-Area2d
--Collisionshape2d 2

Answer 1

Depending on your setup, you could use collision layers. Most of the time this will work. Just set each to be on a different layer, and make sure you have the things it should collide with on that same layer as well.

Comments

Collisionshape2d 1 should not collide with Collisionshape2d 2. Collisionshape2d 1 should not collide with itself. Collisionshape2d 2 should not collide with itself. And then I have the player which should collide with Collisionshape2d 2 but not Collisionshape2d 1. I have doubts to this solution because I already set the layers so that Collisionshape2d 1 does not collide but they still have collision pairs.

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Could you tell me what layer each object is on?

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Looking further I do not think you can change the layers for collisionshape2d only for the staticbody so there is no way to make some collisionshape2d not collide. There still might be??

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You can only change the static body layer

Answer 2

You should probably use collision layers/masks: https://docs.godotengine.org/en/3.1/tutorials/physics/physics_introduction.html#collision-layers-and-masks