2016.8.14 孙广东
第一种方式：
本文参考： http://wiki.unity3d.com/index.php?title=SetPivot
Pivot (锚点)， 熟悉 UGUI肯定熟悉 锚点，
锚点就是 对象的位置中心点， 缩放和旋转的中心！！！
/* * Version: 1.0 * Author: Yilmaz Kiymaz (@VoxelBoy) * Purpose: To be able to change the pivot of Game Objects * without needing to use a separate 3D application. * License: Free to use and distribute, in both free and commercial projects. * Do not try to sell as your own work. Simply put, play nice * Contact: VoxelBoy on Unity Forums */ using UnityEngine; using UnityEditor; public class SetPivot : EditorWindow { Vector3 p; //Pivot value -1..1, calculated from Mesh bounds Vector3 last_p; //Last used pivot GameObject obj; //Selected object in the Hierarchy MeshFilter meshFilter; //Mesh Filter of the selected object Mesh mesh; //Mesh of the selected object Collider col; //Collider of the selected object bool pivotUnchanged; //Flag to decide when to instantiate a copy of the mesh [MenuItem("GameObject/Set Pivot")] //Place the Set Pivot menu item in the GameObject menu static void Init() { SetPivot window = (SetPivot)EditorWindow.GetWindow(typeof(SetPivot)); window.RecognizeSelectedObject(); //Initialize the variables by calling RecognizeSelectedObject on the class instance window.Show(); } void OnGUI() { if (obj) { if (mesh) { p.x = EditorGUILayout.Slider("X", p.x, -1.0f, 1.0f); p.y = EditorGUILayout.Slider("Y", p.y, -1.0f, 1.0f); p.z = EditorGUILayout.Slider("Z", p.z, -1.0f, 1.0f); if (p != last_p) { //Detects user input on any of the three sliders //Only create instance of mesh when user changes pivot if (pivotUnchanged) mesh = meshFilter.sharedMesh; pivotUnchanged = false; UpdatePivot(); last_p = p; } if (GUILayout.Button("Center")) { //Set pivot to the center of the mesh bounds //Only create instance of mesh when user changes pivot if (pivotUnchanged) mesh = meshFilter.sharedMesh; pivotUnchanged = false; p = Vector3.zero; UpdatePivot(); last_p = p; } GUILayout.Label("Bounds " + mesh.bounds.ToString()); } else { GUILayout.Label("Selected object does not have a Mesh specified."); } } else { GUILayout.Label("No object selected in Hierarchy."); } } //Achieve the movement of the pivot by moving the transform position in the specified direction //and then moving all vertices of the mesh in the opposite direction back to where they were in world-space void UpdatePivot() { Vector3 diff = Vector3.Scale(mesh.bounds.extents, last_p - p); //Calculate difference in 3d position obj.transform.position -= Vector3.Scale(diff, obj.transform.localScale); //Move object position //Iterate over all vertices and move them in the opposite direction of the object position movement Vector3[] verts = mesh.vertices; for (int i = 0; i < verts.Length; i++) { verts[i] += diff; } mesh.vertices = verts; //Assign the vertex array back to the mesh mesh.RecalculateBounds(); //Recalculate bounds of the mesh, for the renderer's sake //The 'center' parameter of certain colliders needs to be adjusted //when the transform position is modified if (col) { if (col is BoxCollider) { ((BoxCollider)col).center += diff; } else if (col is CapsuleCollider) { ((CapsuleCollider)col).center += diff; } else if (col is SphereCollider) { ((SphereCollider)col).center += diff; } } } //Look at the object's transform position in comparison to the center of its mesh bounds //and calculate the pivot values for xyz void UpdatePivotVector() { Bounds b = mesh.bounds; Vector3 offset = -1 * b.center; p = last_p = new Vector3(offset.x / b.extents.x, offset.y / b.extents.y, offset.z / b.extents.z); } //When a selection change notification is received //recalculate the variables and references for the new object void OnSelectionChange() { RecognizeSelectedObject(); } //Gather references for the selected object and its components //and update the pivot vector if the object has a Mesh specified void RecognizeSelectedObject() { Transform t = Selection.activeTransform; obj = t ? t.gameObject : null; if (obj) { meshFilter = obj.GetComponent(typeof(MeshFilter)) as MeshFilter; mesh = meshFilter ? meshFilter.sharedMesh : null; if (mesh) UpdatePivotVector(); col = obj.GetComponent(typeof(Collider)) as Collider; pivotUnchanged = true; } else { mesh = null; } } }
要看到效果要设置
调整完锚点位置我们要测试， 调整旋转 或 Scale ，就会看到旋转中心和 缩放中心 就是我们设置的
第二种方式：
其实不用代码调整 也是可以设置 锚点，
那怎么弄？ 父对象， 对，子对象是伴随父对象一起东的， 不管是缩放还是旋转。
大致方法就是新建一个cube（cube最简单，所以用cube， 后面它是父对象）， 把cube想象成模型的锚点，调整cube在模型中的位置（注意现在他俩还不是父子关系！），如图：
然后在hierarchy列表中将模型拖入cube中（这时候Cube成为父对象，是模型的锚点了！！！！），选中cube，在软件左上角将模型中心点改为Pivot（没有什么用，只是便于查看模型的锚点的确切实际坐标而已），如图：
OK，完成，试试选中cube对其进行旋转，模型就围绕这个Cube的中心点旋转!，看看是不是旋转轴和原来的不一样了
http://blog.csdn.net/u010019717/
http://blog.csdn.net/u010019717/
http://blog.csdn.net/u010019717/
