如何从可渲染的原型创建实体

Question

我在玩新的DOTS软件包。

我还没有设法做的一件事是使用原型来创建场景中可见的实体。这就是我到目前为止所拥有的，我可以看到在实体调试器中创建的实体，但它们没有呈现。任何帮助，不胜感激。我想我错过了原型上的一些组件。

using Unity.Entities;
using Unity.Mathematics;
using Unity.Transforms;
using UnityEngine;
public class CreateStuff : MonoBehaviour
{
public int CountX = 100;
public int CountY = 100;
void Start()
{ 
var entityManager = World.Active.EntityManager;
var archetype = entityManager.CreateArchetype(typeof(Translation), typeof(Scale), typeof(Rotation), typeof(MeshRenderer), typeof(MeshFilter));
for (int x = 0; x < CountX; x++)
{
for (int y = 0; y < CountY; y++)
{
var instance = entityManager.CreateEntity(archetype);
var position = transform.TransformPoint(new float3(x - CountX / 2, noise.cnoise(new float2(x, y) * 0.21F) * 10, y - CountY / 2));
entityManager.SetComponentData(instance, new Translation() { Value = position });
entityManager.SetComponentData(instance, new Scale() { Value = 1 });
}
}
}
}

Answer 1

我不确定您是否仍在寻找答案。这就是我设法让它工作的方式。

[SerializeField] private Mesh _mesh;
[SerializeField] private Material _mat;
private void Start()
{
EntityManager entityManager = World.DefaultGameObjectInjectionWorld.EntityManager;
EntityArchetype entityArchetype = entityManager.CreateArchetype(
typeof(RenderMesh),
typeof(LocalToWorld),
typeof(RenderBounds),
);
// create 100 entities
NativeArray<Entity> entityArray = new NativeArray<Entity>(100, Allocator.Temp);
entityManager.CreateEntity(entityArchetype, entityArray);
for (int i = 0; i < entityArray.Length; i++)
{
Entity entity = entityArray[i];
entityManager.SetSharedComponentData(entity, new RenderMesh
{
mesh = _mesh,
material = _mat,
}); 
}
entityArray.Dispose();
}

我通过在YouTube上遵循本教程来做到这一点。

Answer 2

您可以使用 GameObjectConversionUtility

public GameObject Prefab;
var prefab = Unity.Entities.GameObjectConversionUtility.ConvertGameObjectHierarchy(Prefab, World.Active);
var entityManager = World.Active.EntityManager;
var instance = entityManager.Instantiate(prefab);

如果您的预制件有一个渲染器，当它是一个实体时，它会自动拥有一个渲染器。

如果您还没有，请查看 ECS 示例：https://github.com/Unity-Technologies/EntityComponentSystemSamples

Answer 3

代码本身没有问题。 我遇到了同样的问题，首先你必须安装"混合渲染器"(Windeow=>包管理器=>高级=>显示预览传契=>混合渲染器)

我的代码工作正常。您可以从实体和预制件实例化对象

public class ECSObjectSpawner : MonoBehaviour
{
public static ECSObjectSpawner instance;
private World _defaultWorld;
private EntityManager _entityManager;
public List<FromGameObject> fromGameObjects;
private Dictionary<string, Entity> _convertedFromGo;
public List<FromEntity> fromEntities;
private Dictionary<string, FromEntity> _generatedFromEntity;
private void Awake()
{
instance = instance ?? this;
_convertedFromGo = new Dictionary<string, Entity>();
_generatedFromEntity = fromEntities.ToDictionary(x => x.prefabName, x=>x);
}
void Start()
{
// setup references to World and EntityManager
_defaultWorld = World.DefaultGameObjectInjectionWorld;
_entityManager = _defaultWorld.EntityManager;
GameObjectConversionSettings settings = GameObjectConversionSettings.FromWorld(_defaultWorld, null);
_convertedFromGo = fromGameObjects.ToDictionary(x => x.prefabName, x=> GameObjectConversionUtility.ConvertGameObjectHierarchy(x.gameObjectPrefab, settings));
}
public void Instantiate(string key, float3 position, quaternion rotation)
{
if (_generatedFromEntity.TryGetValue(key, out FromEntity fromEntity))
{
InstantiateFromEnity(position, rotation, fromEntity);
return;
}
if (_convertedFromGo.TryGetValue(key, out Entity entity))
{
InstantiateFromGameObject(position, rotation, entity);
return;
}
}
private void InstantiateFromEnity(float3 position, quaternion rotation, FromEntity fromEntity)
{
EntityArchetype archetype = _entityManager.CreateArchetype(
typeof(Translation),
typeof(Rotation),
typeof(RenderMesh),
typeof(RenderBounds),
typeof(LocalToWorld)
);
Entity myEntity = _entityManager.CreateEntity(archetype);
_entityManager.AddComponentData(myEntity, new Translation
{
Value = position
});
_entityManager.AddComponentData(myEntity, new Rotation
{
Value = rotation
});
_entityManager.AddSharedComponentData(myEntity, new RenderMesh
{
mesh = fromEntity.unitMesh,
material = fromEntity.unitMaterial
});
}
private void InstantiateFromGameObject(float3 position, quaternion rotation, Entity entity)
{
Entity myEntity = _entityManager.Instantiate(entity);
_entityManager.SetComponentData(myEntity, new Translation
{
Value = position
});
_entityManager.SetComponentData(myEntity, new Rotation
{
Value = rotation
});
}

}
[System.Serializable]
public sealed class FromGameObject
{
public string prefabName;
public GameObject gameObjectPrefab;
}
[System.Serializable]
public sealed class FromEntity
{
public string prefabName;
public Mesh unitMesh;
public Material unitMaterial;
}