Unity3d学习预设体（prefab）的⼀些理解之前⼀直在想如果要在Unity3d上创建很多个具有相同结构的对象，是如何做的，后来查了相关资料发现预设体可以解决这个问题！
预设体的概念: 组件的集合体 , 预制物体可以实例化成游戏对象.
创建预设体的作⽤: 可以重复的创建具有相同结构的游戏对象。
.1下⾯来讲解⼀下如何制作⼀个简单的预设体(上下为流程和结果图):
.2 创建多个prefabs_new(代码，结果图):
1using UnityEngine;
2using System.Collections;
3
4//[ExecuteInEditMode]表⽰在编辑模式下运⾏(注意改变prefab的属性其他属性也会变)
5public class CreateInstance : MonoBehaviour {
6public GameObject prefabs = null;
7private Vector3 pos;
8void Start () {
9if (prefabs != null)
10        {
11            pos = new Vector3(0, 2.7f, -10.5114f);
12for (int i = 0; i < 5; ++i)
13            {
14                Object tmpObj = Instantiate(prefabs, pos , Quaternion.identity);
15                pos.x = pos.x - 3;
16            }
17        }
18else
19        {
20            Debug.Log("prefabs is null");
21        }
22    }
23 }
如果(预设物C = 预设物B 和预设物 A的组合) 则会形成修改预设物A的数据不会影响预设物C中的内嵌数据，下⾯⽅法可以帮助解决! .4关于perfab之间的嵌套(主要是⼀个perfab数据修改了嵌套这个perfab的数据要做对应的更新):
关于预设体嵌套预设体的代码(在实例化时会拿到最新的perfab数据):
using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
using UnityEditor.Callbacks;
#endif
using System.Collections.Generic;
[ExecuteInEditMode]
public class PrefabInstance : MonoBehaviour
{
public GameObject prefab;
#if UNITY_EDITOR
// Struct of all components. Used for edit-time visualization and gizmo drawing
public struct Thingy {
public Mesh mesh;
public Matrix4x4 matrix;
public List<Material> materials;
}
[System.NonSerializedAttribute] public List<Thingy> things = new List<Thingy> ();
void OnValidate () {
things.Clear();
if (enabled)
Rebuild (prefab, Matrix4x4.identity);
}
identity matrix是什么意思void OnEnable () {
things.Clear();
if (enabled)
Rebuild (prefab, Matrix4x4.identity);
}
void Rebuild (GameObject source, Matrix4x4 inMatrix) {
if (!source)
return;
Matrix4x4 baseMat = inMatrix * Matrix4x4.TRS (-ansform.position, Quaternion.identity, );
foreach (MeshRenderer mr in source.GetComponentsInChildren(typeof (Renderer), true))
{
things.Add(new Thingy () {
mesh = mr.GetComponent<MeshFilter>().sharedMesh,
matrix = baseMat * mr.transform.localToWorldMatrix,
materials = new List<Material> (mr.sharedMaterials)
});
}
foreach (PrefabInstance pi in source.GetComponentsInChildren(typeof (PrefabInstance), true))
{
if (pi.enabled && pi.gameObject.activeSelf)
Rebuild (pi.prefab, baseMat * pi.transform.localToWorldMatrix);
}
}
// Editor-time-only update: Draw the meshes so we can see the objects in the scene view
void Update () {
if (EditorApplication.isPlaying)
return;
Matrix4x4 mat = transform.localToWorldMatrix;
foreach (Thingy t in things)
for (int i = 0; i < t.materials.Count; i++)
Graphics.DrawMesh (t.mesh, mat * t.matrix, t.materials[i], gameObject.layer, null, i);
}
// Picking logic: Since we don't have gizmos.drawmesh, draw a bounding cube around each thingy
void OnDrawGizmos () { DrawGizmos (new Color (0,0,0,0)); }
void OnDrawGizmosSelected () { DrawGizmos (new Color (0,0,1,.2f)); }
void DrawGizmos (Color col) {
if (EditorApplication.isPlaying)
return;
Matrix4x4 mat = transform.localToWorldMatrix;
foreach (Thingy t in things)
{
Gizmos.matrix = mat * t.matrix;
Gizmos., t.mesh.bounds.size);
}
}
// Baking stuff: Copy in all the referenced objects into the scene on play or build
[PostProcessScene(-2)]
public static void OnPostprocessScene() {
foreach (PrefabInstance pi in UnityEngine.Object.FindObjectsOfType (typeof (PrefabInstance)))
BakeInstance (pi);
}
public static void BakeInstance (PrefabInstance pi) {
if(!pi.prefab || !pi.enabled)
return;
GameObject go = PrefabUtility.InstantiatePrefab(pi.prefab) as GameObject;
Quaternion rot = go.transform.localRotation;
Vector3 scale = go.transform.localScale;
pi.prefab = null;
foreach (PrefabInstance childPi in go.GetComponentsInChildren<PrefabInstance>())
BakeInstance (childPi);
}
#endif
上述是两个如果是多个关联呢?

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