#Single entity spawning at 0,0,0 with job system

1 messages · Page 1 of 1 (latest)

candid thistle
#

im using this script to spawn a large amount of entities at a selected spawn point, it works flawlessly except (what seems like the very first frame) a red entity is spawned at 0,0,0 unmoving and i have no idea why

using Authoring;
using Authoring.Enemies;
using Unity.Burst;
using Unity.Collections;
using Unity.Entities;
using Unity.Transforms;
using UnityEngine;

namespace Systems.Enemies
{
    [UpdateBefore(typeof(EnemyMovementSystem))]
    public partial struct EnemySpawnSystem : ISystem
    {
        private EntityQuery enemySpawnPointQuery;
        //private EntityQuery activeEnemiesQuery;
        private float spawnTimer;
        private EntityCommandBuffer ecb;
        
        
        public void OnCreate(ref SystemState state)
        {

            enemySpawnPointQuery = state.GetEntityQuery(
                ComponentType.ReadOnly<LocalTransform>(),
                ComponentType.ReadOnly<EnemySpawner>()
            );
            // activeEnemiesQuery = state.GetEntityQuery(
            //     ComponentType.ReadOnly<EnemyMover>()
            // );
            
            ecb = new EntityCommandBuffer(Allocator.Persistent);
            
            state.RequireForUpdate<EntityReferences>();
            state.RequireForUpdate(enemySpawnPointQuery);
            
        }

        
        [BurstCompile]
        public void OnUpdate(ref SystemState state)
        {
            
            EntityReferences entityReferences = SystemAPI.GetSingleton<EntityReferences>();
            Entity enemyPrefab = entityReferences.enemyPrefabEntity;
            
            
            ecb = new EntityCommandBuffer(Allocator.TempJob);
            EntityCommandBuffer.ParallelWriter parallelEcb = ecb.AsParallelWriter();

            //int enemyCount = activeEnemiesQuery.CalculateEntityCount();
            //Debug.Log($"There are currently {enemyCount} enemies.");
            
            
            EnemySpawnerJob enemySpawnerJob = new EnemySpawnerJob
            {
                deltaTime = SystemAPI.Time.DeltaTime,
                commandBuffer = parallelEcb,
                enemyPrefab = enemyPrefab
            };
            state.Dependency = enemySpawnerJob.ScheduleParallel(enemySpawnPointQuery, state.Dependency);
            
            state.Dependency.Complete();
            ecb.Playback(state.EntityManager);
            ecb.Dispose();
        }
        
        public void OnDestroy(ref SystemState state)
        {
            if (ecb.IsCreated)
                ecb.Dispose();
        }
    }

    [BurstCompile]
    public partial struct EnemySpawnerJob : IJobEntity
    {
        public float deltaTime;
        public EntityCommandBuffer.ParallelWriter commandBuffer;
        public Entity enemyPrefab;
        
        
        public void Execute([EntityIndexInQuery] int entityIndex, in LocalTransform localTransform, ref EnemySpawner enemySpawner)
        {
            Entity enemyEntity = commandBuffer.Instantiate(entityIndex, enemyPrefab);
            commandBuffer.AddComponent(entityIndex, enemyEntity, new EnemyMover
            {
                moveSpeed = 3f,
                rotationSpeed = 10f
            });
            commandBuffer.SetComponent(entityIndex, enemyEntity, LocalTransform.FromPosition(localTransform.Position));
            
            
        }
    }
}
image.png
fast harbor
#

Can you switch your ecb to this and try? I believe the issue is related to the timing of some transform system(s)

SystemAPI.GetSingleton<BeginSimulationEntityCommandBufferSystem.Singleton>()
                .CreateCommandBuffer(state.WorldUnmanaged)
                .AsParallelWriter()
candid thistle
#

let me give it a shot, thanks for the help

candid thistle
fast harbor