增加用户缩放相机体验,扩大相机范围,并且限定用户的缩放范围,避免缩放后物体过小而对象找不到的问题.

src/CameraUpdate.ts

@@ -30,10 +30,13 @@ export class CameraUpdate
     //观察的轨道.
     private m_Orbit: Orbit = new Orbit();
 
+    m_MinViewHeight = 10;
+    m_MaxViewHeight = 3e4;
+
     constructor()
     {
         this.m_CameraArray.set(THREE.OrthographicCamera, new THREE.OrthographicCamera(-2, 2, 2, -2,
-            -100000, 100000));
+            -1e6, 1e6));
 
         this.m_CameraArray.set(THREE.PerspectiveCamera, new THREE.PerspectiveCamera(50, 1, 0.01, 10000));
 
@@ -60,7 +63,7 @@ export class CameraUpdate
     }
     set ViewHeight(height)
     {
-        this.m_ViewHeight = THREE.Math.clamp(height, 1e-8, 1e8);
+        this.m_ViewHeight = THREE.Math.clamp(height, this.m_MinViewHeight, this.m_MaxViewHeight);
     }
 
     SetSize(width: number, height: number)
@@ -114,7 +117,7 @@ export class CameraUpdate
         if (this.Camera instanceof THREE.OrthographicCamera)
         {
             this.ViewHeight *= scale;
-            if (scaleCenter)
+            if (scaleCenter && this.m_ViewHeight < this.m_MaxViewHeight)
             {
                 this.m_Target.sub(scaleCenter);
                 this.m_Target.multiplyScalar(scale);