1. A concise explanation of the problem you’re experiencing.
I want to change the zoom step length, eg: when my mouse wheel scroll once, camera’s height minus 100km.
**Is there a way to modify the step size of the scroll wheel? mouse ****wheel scroll once, camera’s height minus 50km. **I watched the Cesium.ScreenSpaceCameraController class, but there seems to be no way to change this.
2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
4. The Cesium version you’re using, your operating system and browser.
Modifying private properties isn’t recommended since the API for those might change in the future, but it could be a quick hack to allow you to control the speed. An even better solution would be to modify the class to make the property public, documenting it and making a contribution to Cesium! It should be a straightforward enough change. Check out the contributing guide here (https://github.com/AnalyticalGraphicsInc/cesium/blob/master/CONTRIBUTING.md).