地形夸张函数不起作用？

kadi

请问我使用这段代码想修改地形夸张系数为什么不起作用？

1. osgEarth::MapNodeOptions mapNodeOptions = mapNode->getMapNodeOptions();
   
2. osgEarth::TerrainOptions terrainOptions = mapNodeOptions.getTerrainOptions();
   
3. terrainOptions.verticalScale() = 50.0;
   
4. mapNodeOptions.setTerrainOptions(terrainOptions);
   
5. ElevationLayerOptions elevationOpt;
   
6. elevationOpt.driver() = mapNodeOptions;
   
7. ElevationLayer* layer = new ElevationLayer(elevationOpt);
   
8. mapNode->getMap()->addElevationLayer(layer);

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