Question Classic Physics equivalent APIs?

Currently how should I implement Physics.OverlapSphereNonAlloc, Physics.SphereCastNonAlloc equivalent in DOTS Physics? What I want to achieve is when the player attacks or cast skill, create a sphere collider to check collision whether it hits enemy then remove sphere collider after complete the attack in GC free way. The sphere collider able to change its size dynamically based on the type of attack or cast.

 

DTOS itself is GC free (in build and when all safety checks disabled in editor). You can look at docs and see collider cast. Sample implements exactly casting sphere. You can cast it with same From\To points and I guess it will be like overlap
https://docs.unity3d.com/Packages/com.unity.physics@0.2/manual/collision_queries.html#collider-casts

 

You can do OverlapSphere by doing a point query with a positive distance, avoiding the need to create a sphere collider. For example:

PhysicsWorld.CalculateDistance(new PointDistanceInput { Position = center, MaxDistance = radius }, ... )

I expect we will add more explicit query functions like OverlapSphere() etc to make this more discoverable.

 

Hi @Rory_Havok. Can you provide an example code? I try to get the API working inside SystemBase but keep getting the following error.

Spoiler

AssertionException: Assertion failure. Value was False
Expected: True
UnityEngine.Assertions.Assert.Fail (System.String message, System.String userMessage) (at <94c5f4c38cdc42d2b006f8badef04394>:0)
UnityEngine.Assertions.Assert.IsTrue (System.Boolean condition, System.String message) (at <94c5f4c38cdc42d2b006f8badef04394>:0)
UnityEngine.Assertions.Assert.IsTrue (System.Boolean condition) (at <94c5f4c38cdc42d2b006f8badef04394>:0)
Unity.Physics.Broadphase.CalculateDistance[T] (Unity.Physics.PointDistanceInput input, Unity.Collections.NativeSlice`1[T] rigidBodies, T& collector) (at Library/PackageCache/com.unity.physics@0.2.5-preview.1/Unity.Physics/Collision/World/Broadphase.cs:401)
Unity.Physics.CollisionWorld.CalculateDistance[T] (Unity.Physics.PointDistanceInput input, T& collector) (at Library/PackageCache/com.unity.physics@0.2.5-preview.1/Unity.Physics/Collision/World/CollisionWorld.cs:157)
Unity.Physics.PhysicsWorld.CalculateDistance[T] (Unity.Physics.PointDistanceInput input, T& collector) (at Library/PackageCache/com.unity.physics@0.2.5-preview.1/Unity.Physics/Dynamics/World/PhysicsWorld.cs:91)
Unity.Physics.QueryWrappers.CalculateDistance[T] (T& target, Unity.Physics.PointDistanceInput input) (at Library/PackageCache/com.unity.physics@0.2.5-preview.1/Unity.Physics/Collision/Queries/Collidable.cs:157)
Unity.Physics.PhysicsWorld.CalculateDistance (Unity.Physics.PointDistanceInput input) (at Library/PackageCache/com.unity.physics@0.2.5-preview.1/Unity.Physics/Dynamics/World/PhysicsWorld.cs:86)
PhysicsOverlapSphereSystem.OnUpdate () (at Assets/Sources/Physics/PhysicsOverlapSphereSystem.cs:25)
Unity.Entities.SystemBase.Update () (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/SystemBase.cs:150)
Unity.Entities.ComponentSystemGroup.UpdateAllSystems () (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystemGroup.cs:182)
UnityEngine.Debug:LogException(Exception)
Unity.Debug:LogException(Exception) (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/Stubs/Unity/Debug.cs:19)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystemGroup.cs:186)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystemGroup.cs:169)
Unity.NetCode.ServerSimulationSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.netcode@0.1.0-preview.6/Runtime/ClientServerWorld/ServerSimulationSystemGroup.cs:72)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystem.cs:107)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystemGroup.cs:182)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystemGroup.cs:169)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystem.cs:107)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystemGroup.cs:182)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystemGroup.cs:169)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ComponentSystem.cs:107)
Unity.Entities.DummyDelegateWrapper:TriggerUpdate() (at Library/PackageCache/com.unity.entities@0.6.0-preview.24/Unity.Entities/ScriptBehaviourUpdateOrder.cs:152)

 

Not right now, but I expect you are not setting the collision filter in the input - just set input.Filter to e.g. CollisionFilter.Default.