!1297 改进:旋转相机时,使用完全可见的实体作为聚焦中心,如果没有完全可见的,则退化到当前可见实体的中心

src/GraphicsSystem/Viewer.ts

@@ -1,4 +1,4 @@
-import { AmbientLight, Box3, Matrix4, Object3D, Scene, Vector2, Vector3, WebGLRenderer } from 'three';
+import { AmbientLight, Box3, Frustum, Matrix4, Object3D, Scene, Vector2, Vector3, WebGLRenderer } from 'three';
 import { EffectComposer } from "three/examples/jsm/postprocessing/EffectComposer";
 import { RenderPass } from "three/examples/jsm/postprocessing/RenderPass";
 import { SMAAPass } from "three/examples/jsm/postprocessing/SMAAPass";
@@ -386,7 +386,22 @@ export class Viewer
         if (this.OutlinePass.selectedObjects.length > 0)
             box = GetBoxArr(this.OutlinePass.selectedObjects);
         else
-            box = GetBoxArr(this.VisibleObjects);
+        {
+            let projScreenMatrix = new Matrix4().multiplyMatrices(this.Camera.projectionMatrix, this.Camera.matrixWorldInverse);
+            let frustum = new Frustum().setFromProjectionMatrix(projScreenMatrix);
+            box = new Box3;
+            for (let obj of this.VisibleObjects)
+            {
+                let objBox = GetBox(obj);
+                if (frustum.containsPoint(objBox.min)
+                    && frustum.containsPoint(objBox.max))
+                    box.union(objBox);
+            }
+
+            if (box.isEmpty())
+                box = GetBoxArr(this.VisibleObjects);
+        }
+
         if (!box.isEmpty())
             this.LookTarget = box.getCenter(new Vector3());
         else