fix: （交通-场景浏览）添加基准点/基准线，场景画面黑屏

public/static/lib/potree/potree.js

@@ -139524,14 +139524,17 @@ ENDSEC
 	                boundSize.x = Math.max(min, boundSize.x);
 	                boundSize.y = Math.max(min, boundSize.y);
 	            }
-	            if(camera.type == 'OrthographicCamera'){
-	                //dis = boundSize.length()   
-	                o.dontChangeCamDir = true; //强制不改方向
-	                //必须在模型外部
-	                this.mainViewport.targetPlane.setFromNormalAndCoplanarPoint(this.mainViewport.view.direction, this.bound.center ); 
-	                this.mainViewport.targetPlane.projectPoint(target,  this.mainViewport.shiftTarget ); //得到target在中心面的投影
-	                let pos = this.splitScreen.getPosOutOfModel(this.mainViewport, this.bound.size);  //得到观察位置（shiftTarget投影到模型外部）
-	                dis = pos.distanceTo(target);   
+	            if(camera.type == 'OrthographicCamera'){ 
+	                if(o.dontChangeCamDir) {
+	                    //必须在模型外部(如点击测量线时)
+	                    this.mainViewport.targetPlane.setFromNormalAndCoplanarPoint(this.mainViewport.view.direction, this.bound.center ); 
+	                    this.mainViewport.targetPlane.projectPoint(target,  this.mainViewport.shiftTarget ); //得到target在中心面的投影
+	                    let pos = this.splitScreen.getPosOutOfModel(this.mainViewport, this.bound.size);  //得到观察位置（shiftTarget投影到模型外部）
+	                    dis = pos.distanceTo(target);  
+	                }else {
+	                    dis = boundSize.length(); 
+	                }                   
+	                
 	            }else {
 	                let aspect = boundSize.x / boundSize.y;
 	                if(camera.aspect > aspect){//视野更宽则用bound的纵向来决定