[SOLVED] ApplyLinearImpulse not doing anything | Official Unity Discord | Page 1

lusty jewel Apr 17, 2023, 6:33 AM

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https://gdl.space/elozexebug.cs
This is the code, can anyone guide me why no force is being applied and the objects simply fall down

hollow timber Apr 17, 2023, 6:52 AM

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You aren't writing the physics velocity back to the entity

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you are just modifying the local struct

lusty jewel Apr 17, 2023, 7:00 AM

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@hollow timber can you guide me how to do that? I saw a few tutorials but I dont get it

hollow timber Apr 17, 2023, 7:07 AM

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You just need to call SetComponent(entity, pv)

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struct vs class

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I always find thinking of this as imagine pv was an int

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int pv = SystemAPI.GetComponent<int>(hitting);
pv = 3;

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i'm pretty sure you'd now realize this hasn't actually done anything yet

lusty jewel Apr 17, 2023, 7:08 AM

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hold on this just confusing XD give me 2 mins to get this around my head

hollow timber Apr 17, 2023, 7:08 AM

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what you're missing is just
SystemAPI.SetComponent(entity, pv)

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(there's a bunch of other issues with this system though)

lusty jewel Apr 17, 2023, 7:11 AM

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IT WORKED!! Thank you so much, the previous tutorials I saw didnt show this part and could I find it in the documentation. Although I would like to understand if I could have a few minutes of your time.

I got reference to the physicsVelocity so shouldn't APplyForce apply straight back to the entities component?

hollow timber Apr 17, 2023, 7:11 AM

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EntityQueryBuilder builder = new EntityQueryBuilder(Allocator.Temp).WithAll<PhysicsWorldSingleton>();
EntityQuery singletonQuery = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntityQuery(builder);```

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you shouldn't be doing this

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you should use the systems entitymanager

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EntityManager exists as a property on the system

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use that instead of
EntityManager entityManager = World.DefaultGameObjectInjectionWorld.EntityManager;

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this should not be create each frame

EntityQueryBuilder builder = new EntityQueryBuilder(Allocator.Temp).WithAll<PhysicsWorldSingleton>();
EntityQuery singletonQuery = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntityQuery(builder);
var physSingleton = singletonQuery.GetSingleton<PhysicsWorldSingleton>();```
the easiest way is just to do
var physSingleton = SystemAPI.GetSingleton<PhysicsWorldSingleton>()

lusty jewel Apr 17, 2023, 7:13 AM

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hollow timber use that instead of `EntityManager entityManager = World.DefaultGameObjectInject...

at the end?

hollow timber Apr 17, 2023, 7:13 AM

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        EntityQueryBuilder builder = new EntityQueryBuilder(Allocator.Temp).WithAll<PhysicsWorldSingleton>();
        EntityQuery singletonQuery = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntityQuery(builder);
        var physSingleton = singletonQuery.GetSingleton<PhysicsWorldSingleton>();

        singletonQuery.Dispose();
        builder.Dispose();```
delete all this

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replace with
var physSingleton = singletonQuery.GetSingleton<PhysicsWorldSingleton>();

lusty jewel Apr 17, 2023, 7:15 AM

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but now I have a error on SingletonQuery

lusty jewel Apr 17, 2023, 7:16 AM

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hollow timber this should not be create each frame ```cs EntityQueryBuilder builder = new Enti...

OH I GET IT! I should not be creating these variables every frame. Instead I can do it only once?

hollow timber Apr 17, 2023, 7:19 AM

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yes

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either use SystemAPI.QueryBuilder which will handle it for you

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or for singletons just use GetSingleton

lusty jewel Apr 17, 2023, 7:23 AM

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sorry im new and this is getting a bit confusion.

I should use singletonQuery instead of making everything everytime. Which I understand but Now that I have commented

    EntityQuery singletonQuery = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntityQuery(builder);

Im getting a error because builder is not a variable anymore

hollow timber Apr 17, 2023, 7:38 AM

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you don't n eed a builder

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delete it

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        EntityQueryBuilder builder = new EntityQueryBuilder(Allocator.Temp).WithAll<PhysicsWorldSingleton>();
        EntityQuery singletonQuery = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntityQuery(builder);
        var physSingleton = singletonQuery.GetSingleton<PhysicsWorldSingleton>();

        singletonQuery.Dispose();
        builder.Dispose();```

delete everything here

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replace it with
var physSingleton = SystemAPI.GetSingleton<PhysicsWorldSingleton>();

lusty jewel Apr 17, 2023, 7:39 AM

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It worked. Thank you so much

#[SOLVED] ApplyLinearImpulse not doing anything