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Assets/Scripts/UI/Common/ModelViewer/ModelViewerUtils.cs

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+using UnityEngine;
+
+namespace NBF
+{
+    public class ModelViewerUtils
+    {
+        public static ModelViewerSettings InitSetting(GameObject go, ModelViewerSettings settings)
+        {
+            if (settings.objectPosition.magnitude < 0.0001f)
+                settings.objectPosition = Vector3.zero;
+
+            //---Zero the GameObject euler angles if they're very small in magnitude---//
+            settings.objectRotation = go.transform.eulerAngles;
+            if (settings.objectRotation.magnitude < 0.0001f)
+                settings.objectRotation = Vector3.zero;
+
+            //---Set the object scale variable---//
+            settings.objectScale = go.transform.localScale;
+
+            //将默认对象位置设为使其位于图标中心的位置
+            Bounds bounds = GetObjectBounds(go);
+            settings.objectPosition = GetObjectAutoOffset(bounds);
+
+            // 将默认的相机设置调整为适合图标渲染中对象的呈现效果
+            float camAuto = GetCameraAuto(bounds);
+            settings.cameraSize = camAuto;
+            settings.cameraPosition = Vector3.one * camAuto;
+
+
+            return settings;
+        }
+
+        public static Bounds GetObjectBounds(GameObject go)
+        {
+            // 在将其位置归零之前先保存其位置信息
+            Vector3 prefabPos = go.transform.position;
+            go.transform.position = Vector3.zero;
+
+            // 创建一个边界对象，并将对象网格的边界进行封装。
+            MeshRenderer mr = go.GetComponent<MeshRenderer>();
+            Bounds bounds = new Bounds(Vector3.zero, 0.000001f * Vector3.one);
+            if (mr != null)
+                bounds.Encapsulate(mr.bounds);
+            else
+            {
+                SkinnedMeshRenderer smr = go.GetComponent<SkinnedMeshRenderer>();
+                if (smr != null)
+                    bounds.Encapsulate(smr.bounds);
+            }
+
+            //同时将对象的子对象的范围也进行封装起来
+            EncapsulateChildBounds(go.transform, ref bounds);
+
+            //将预制物的位置重置为存储的值
+            go.transform.position = prefabPos;
+
+            return bounds;
+        }
+
+        public static Vector3 GetObjectAutoOffset(Bounds bounds)
+        {
+            //将偏移量应用到图标对象的位置上
+            return -bounds.center;
+        }
+
+        public static float GetCameraAuto(Bounds bounds)
+        {
+            //---Scale camera size and position so that the object fits in the render---//
+            Matrix4x4 trs = Matrix4x4.TRS(Vector3.zero, Quaternion.Euler(0, 45, 0), 1.05f * Vector3.one);
+            Vector3 corner = new Vector3(bounds.extents.x, bounds.extents.y, bounds.extents.z);
+            corner = trs * corner;
+
+            Vector2 refB2 = new Vector2(0.74f, 0.53f);
+            Vector2 b2 = refB2 * corner.magnitude;
+
+            return b2.magnitude;
+        }
+
+        public static void EncapsulateChildBounds(Transform t, ref Bounds bounds)
+        {
+            // 遍历所有子对象，封装边界
+            MeshRenderer mr;
+            for (int i = 0; i < t.childCount; i++)
+            {
+                mr = t.GetChild(i).GetComponent<MeshRenderer>();
+                if (mr != null)
+                    bounds.Encapsulate(mr.bounds);
+                else
+                {
+                    SkinnedMeshRenderer smr = t.GetChild(i).GetComponent<SkinnedMeshRenderer>();
+                    if (smr != null)
+                        bounds.Encapsulate(smr.bounds);
+                }
+
+                EncapsulateChildBounds(t.GetChild(i), ref bounds);
+            }
+        }
+    }
+}