diff --git a/lib/mappers/CesiumParametersMapper.js b/lib/mappers/CesiumParametersMapper.js
index 2cfe0333bf4cc222c8dc2a120126c2719ae50c78..b3f0d7041e7572b84e5ab1d85e19d04fe68eea87 100644
--- a/lib/mappers/CesiumParametersMapper.js
+++ b/lib/mappers/CesiumParametersMapper.js
@@ -6,12 +6,11 @@ define([
   return declare(null, {
 
     constructor: function () {
-      let viewer = CesiumViewer.getViewer();
-      this._scene = viewer.scene;
+      this._viewer = CesiumViewer.getViewer();
     },
 
     cullingVolume2Url: function () {
-      let planes = this._scene.frameState.cullingVolume.planes;
+      let planes = this._viewer.camera.frustum._offCenterFrustum._cullingVolume.planes;
       let result = [];
       for (i = 0, len = planes.length; i < len; i++) {
         result.push(planes[i].x)
@@ -23,7 +22,7 @@ define([
     },
 
     camera2Url: function () {
-      let camera = this._scene.frameState.camera;
+      let camera = this._viewer.camera;
       let position = camera.position;
       let direction = camera.direction;
       let result = [];
@@ -37,9 +36,9 @@ define([
     },
 
     frustum2Url: function () {
-      let near = this._scene.frameState.camera.frustum._offCenterFrustum.near;
-      let top = this._scene.frameState.camera.frustum._offCenterFrustum.top;
-      let right = this._scene.frameState.camera.frustum._offCenterFrustum.right;
+      let near = this._viewer.camera.frustum._offCenterFrustum.near;
+      let top = this._viewer.camera.frustum._offCenterFrustum.top;
+      let right = this._viewer.camera.frustum._offCenterFrustum.right;
       let result = [];
       result.push(near);
       result.push(top);
@@ -48,8 +47,8 @@ define([
     },
 
     drawingBuffer2Url: function () {
-      let width = this._scene.frameState.context.drawingBufferWidth;
-      let height = this._scene.frameState.context.drawingBufferHeight;
+      let width = this._viewer.scene.frameState.context.drawingBufferWidth;
+      let height = this._viewer.scene.frameState.context.drawingBufferHeight;
       let result = [];
       result.push(width);
       result.push(height);