Grass for Corona and vray render.
There is a 1000cm * 1000cm plane in the scene and includes the following:
3Dsmax File (Corona2015)
3Dsmax File (vray2018 with choas scatter)
3Dsmax File (vray2015, just Base Objects and no scattering).
Textures
Scatter Setting (screenshot of corona scatter setting and choas scatter setting)
FBX and obj file contain 11 grass and ground and no scatters.
Corona scatter and choas scatter are set to Count, per square, so when changing the size of the grass area, the number of plants will change automatically.
Who works with V-Ray version lower than 3.1, pay attention to materials section BRDF (Microfaset GTR (GGX)), if your version is older than 3.1 - this section will be empty, and you have to choose: Blinn, Ward or Phong, d dependence on material For Corona render, it is recommended to install a version of at least 1.5, since the glossiness of materials is configured considering PBR