This project is have developed an efficient rendering system capable of rendering a vast number of grass meshes with Unity's GPU Instancing technique. We can tremendously reduce draw calls by using such technique and we can use actual grass mesh instead of grass mesh card. I also did frustum culling and HiZ occlusion culling for optimization.
For more break-down details, feel free to check my dev blog: https://www.yuque.com/qwerasdwww/dfy5xd