I wrote a simple Dynamo script that will scatter trees or grass etc inside revit,
this is the very first try and it works well for me.
If someone need it, you may download from Online package search:"RevitScatterForOctaneRender"through Dynamo in Revit.
Before this, I used some other softwares like phantom scatter or forestpack etc, they are all good software, but they are all out of revit,
I was suffering exporting importing back and forth which is not very convinient.
Now we can do it within revit quick and simple.
EnJoy!