Over 1 million trees on 15x15km terrain. How to?

Folks, I need some help how to draw a huge and dense forest on my large terrain. It requires over 1 million trees but FPS drops to 5-10 even with 400 000. I am looking for effective tools or tricks, any advice will be appreciated. The player will go there so cannot be completely replaced with forest textures.

  • Welcome to this forum!!

  • Try to add fog and 5km of camera visibility.

  • Use ECS:
    https://www.youtube.com/watch?v=j2z5KRWZTDA

  • Use tree game object with LOD.

  • Try to use a very simple shader for distant trees without a bump mapping, reflection, metallic maps, ambient occlusion, etc…

  • Add vertex ambient occlusion shadow to the mesh triangles.

  • Make the shader material that do not cast or receive shadows.

  • Do a unique custom simple transparent mesh that does not render but cast a shadow. face it looking the sun. Place this game object in each tree LOD. So that shadow is visible if close.

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Vegetation Studio PRO did the job.