Entity System Collider And Destroy

Question

Whats wrong with this code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using Unity.Entities;
 using Unity.Jobs;
 using Unity.Mathematics;
 using Unity.Physics;
 using Unity.Physics.Systems;
 
 public class CollideAndDestroyController : JobComponentSystem
 {
     private BuildPhysicsWorld buildPhysicsWorld;
     private StepPhysicsWorld stepPhysicsWorld;
 
     private struct DestroyJob : ITriggerEventsJob
     {
 
         public ComponentDataFromEntity<CollideAndDestroy> collideAndDestroyGroup;
         public ComponentDataFromEntity<BallFollowData> ballFollowGroup;
         private EntityCommandBuffer.ParallelWriter commandBuffer; 
         public void Execute(TriggerEvent triggerEvent)
         {
             if (collideAndDestroyGroup.HasComponent(triggerEvent.EntityA))
             {
                 if (ballFollowGroup.HasComponent(triggerEvent.EntityB))
                 {
                      commandBuffer.DestroyEntity(triggerEvent.EntityB.Index,triggerEvent.EntityB);
                 }
             }
 
 
         }
     }
 
     protected override JobHandle OnUpdate(JobHandle inputDeps)
     {
         var destroyJob = new DestroyJob
         {
             collideAndDestroyGroup = GetComponentDataFromEntity<CollideAndDestroy>(),
             ballFollowGroup = GetComponentDataFromEntity<BallFollowData>()
 
 
         };
         return destroyJob.Schedule(stepPhysicsWorld.Simulation, ref buildPhysicsWorld.PhysicsWorld, inputDeps);
     }
 }

error: NullReferenceException: Object reference not set to an instance of an object CollideAndDestroyController.OnUpdate (Unity.Jobs.JobHandle inputDeps) (at Assets/Scripts/Systems/CollideAndDestroyController.cs:44)

Answer 1

com.unity.physics 0.50.0-preview.43

 using System.Collections.Generic;
 using UnityEngine;
 using Unity.Entities;
 using Unity.Jobs;
 using Unity.Collections;
 using Unity.Mathematics;
 using Unity.Physics;
 using Unity.Physics.Systems;
 using BurstCompile = Unity.Burst.BurstCompileAttribute;
 
 [UpdateInGroup( typeof(FixedStepSimulationSystemGroup) )]
 [UpdateAfter( typeof(StepPhysicsWorld) )]
 public partial class CollideAndDestroyController : SystemBase
 {
 
     StepPhysicsWorld _stepPhysicsWorld;
     EntityCommandBufferSystem _commandBufferSystem;
 
     protected override void OnCreate ()
     {
         base.OnCreate();
         _stepPhysicsWorld = World.GetOrCreateSystem<StepPhysicsWorld>();
         _commandBufferSystem = World.GetOrCreateSystem<EndFixedStepSimulationEntityCommandBufferSystem>();
     }
 
     protected override void OnStartRunning ()
     {
         base.OnStartRunning();
         this.RegisterPhysicsRuntimeSystemReadOnly();
     }
 
     protected override void OnUpdate ()
     {
         var collideAndDestroyData = GetComponentDataFromEntity<CollideAndDestroy>( isReadOnly:true );
         var ballFollowDataData = GetComponentDataFromEntity<BallFollowData>( isReadOnly:true );
 
         var destroyJob = new CollideAndDestroyJob{
             collideAndDestroyGroup  = collideAndDestroyData ,
             ballFollowGroup         = ballFollowDataData ,
             commandBuffer           = _commandBufferSystem.CreateCommandBuffer()
         };
         this.Dependency = destroyJob.Schedule( _stepPhysicsWorld.Simulation , this.Dependency );
 
         var triggerJob = new TriggerAndDestroyJob{
             collideAndDestroyGroup  = collideAndDestroyData ,
             ballFollowGroup         = ballFollowDataData ,
             commandBuffer           = _commandBufferSystem.CreateCommandBuffer()
         };
         this.Dependency = triggerJob.Schedule( _stepPhysicsWorld.Simulation , this.Dependency );
 
         _commandBufferSystem.AddJobHandleForProducer( this.Dependency );
     }
     
 }
 
 [BurstCompile]
 struct CollideAndDestroyJob : ICollisionEventsJob
 {
     [ReadOnly] public ComponentDataFromEntity<CollideAndDestroy> collideAndDestroyGroup;
     [ReadOnly] public ComponentDataFromEntity<BallFollowData> ballFollowGroup;
     public EntityCommandBuffer commandBuffer;
     public void Execute ( CollisionEvent evt )
     {
         Entity A = evt.EntityA, B = evt.EntityB;
         if( collideAndDestroyGroup.HasComponent(A) )
         if( ballFollowGroup.HasComponent(B) )
             commandBuffer.DestroyEntity(B);
     }
 }
 
 [BurstCompile]
 struct TriggerAndDestroyJob : ITriggerEventsJob
 {
     [ReadOnly] public ComponentDataFromEntity<CollideAndDestroy> collideAndDestroyGroup;
     [ReadOnly] public ComponentDataFromEntity<BallFollowData> ballFollowGroup;
     public EntityCommandBuffer commandBuffer;
     public void Execute ( TriggerEvent evt )
     {
         Entity a = evt.EntityA, b = evt.EntityB;
         if( collideAndDestroyGroup.HasComponent(a) )
         if( ballFollowGroup.HasComponent(b) )
             commandBuffer.DestroyEntity(b);
     }
 }

raise collision events

Entity System Collider And Destroy

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