Resolved How to change the CollisionFilter at Runtime

I want my character to collide with A when he is in the air but not when he is on the ground.
So I have looked for a way to change the CollisionFilter during the runtime but could not find it.

How do I change the CollisionFilter at runtime?

 

I was able to solve this problem with the help of this post.
https://forum.unity.com/threads/collisionfilter-authoring.1437421/

using Unity.Physics;

using Unity.Physics.Systems;

using Unity.Physics.Extensions;





BlobAssetReference<Collider> ColliderBlobReference = physicsCollider.ValueRO.Value.Value.Clone();

CollisionFilter oldFilter = physicsCollider.ValueRO.Value.Value.GetCollisionFilter();

PhysicsCollider newCollider;



ColliderBlobReference.Value.SetCollisionFilter(new CollisionFilter

{

BelongsTo = 0b_0000_0000_0000_0000_0000_0000_0000_0000,

CollidesWith = 0b_0000_0000_0000_0000_0000_0000_0000_0000,

GroupIndex = oldFilter.GroupIndex,

});

newCollider = ColliderBlobReference.AsComponent();

ECB.SetComponent(sortKey, entity, newCollider);

It seems costly to copy the PhysicsCollider, which is a BlobAsset, apply a new CollisionFilter and SetComponent again, but I think I will go with this.



Note that I first tried to turn the Collider on and off by preparing two children and applying a different CollisionFilter to each, and setting the CollisionWorldIndex to a value not used (such as 10) depending on the situation, but this failed.

Thank you very much.

 

It worked!