Terrain Tree Distance Not Working?

Hi! I've recently put together a quick forest scene that has a lot of grass and trees. I'm getting into the optimization stage, but I'm running into some issues. The grass is what's causing most of the performance issues (they're LODs painted onto the terrain as tree prefabs). I'd like to shorten the draw distance on them, but the tree distance slider in my terrain isn't doing anything. Whether I have it set to 1 or 2000, the grass all stays at any distance. If I set it to 0, it all disappears. It's basically forcing me into an all or nothing state with my grass.

Also, as a side note, Occlusion Culling doesn't seem to be working properly for me. I have get an overall framerate drop when using it, so I'm not sure what's going on there.

Let me know if you need any more information, and thank you in advance for the help!

 

Unity's grass system is not optimized on the grass and foliage part
You must use asset store solutions like Vegetation studio :
https://assetstore.unity.com/packages/tools/terrain/vegetation-studio-103389

My maxed out grass density :

The frame rate is not good for games

 

I've noticed that too, if your trees have a LOD component then they don't seem affected by Tree Distance (they're either on at 1 or off at 0). In my case the problem was solved by removing my custom LODs as I was fine with Unity's handling of my trees

 

"Also, as a side note, Occlusion Culling doesn't seem to be working properly for me. I have get an overall framerate drop when using it, so I'm not sure what's going on there."

I can honestly say that many of us have run into that problem, its been talked about many times. OC doesnt always work correctly in certain situations, sometimes due to wrong static tags selected (occluder, occludee, etc.), or too many objects in scene, not sure of the root cause.

Example, in my game Jurassic Extinction i have 9 levels/scenes, and OC is set up correctly, but really doesnt help much at all, in some scenes it actually makes things (fps/ms) worse. So i ended up not using it at all. So unless you have things set wrong, its just the nature of the beast.

 

OC makes lags on mobile devices, you can use per layer camera clipping instead ,to have the best performance