How would you best achieve something like this?
Sps or instances or ?
They could sway better with sps no?
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I think there is a way to do this… without blizzard of vertices.
About two years ago I made a bunch of trees and bushes on fire…
All folliage were transluscent 2D planes, on a rotation toward the camera with lookAt.
The weird thing was… walking around the 2D trees (which rotated)
It wasnt possible to notice it was a 2D material.
So in theory… your dense foliage could be a bunch of 2D planes (instead of dense vertex-forest)
We are about to use that technique for things like clouds…
Make the perfect image in gimp then display on a plane. Good for many things. : )
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For realistic foliage like that, I will definitely use a tool like Speedtree, or buying some already made models, then use instancing of course, 'cause these models could be heavy. You’ll also for sure have to fight against alpha issue 
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What is alpha issue?
Would that effect many 2D planes with alpha?
Well, @withADoveInOneHand, I use instances as for me it is easier to create in Blender than code.
Example: Terrain
All the rocks, trees, and little brown bushes are instances , but maybe they are not dense enough?
cheers, gryff 
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Awesome, thanks yall for the insight, inspiration and examples.
I want to accommodate low end devices, but it’s nice to see where and how far to go.
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SPS is awesome too.
Here is an example with just one lowpoly tree and grass.
https://ssatguru.github.io/Vishva.ts/public_html/index.html?world=spsDemo
Use scroll wheel to zoom out and see the number of trees.
Could not figure out how to sway/animate the trees and grass though.
Anybody any ideas?
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Wow that’s really great, thanks for sharing.
Couldn’t you just do a rotation with a pivot like what’s happening here? https://playground.babylonjs.com/#LXXL6Y#1
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… great trees!
When you have many meshes with many materials using alpha, you may get some z-order issue (alpha flickering for example). You can play with some properties to avoid that, depending on your scene.
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You could have a play around with furMaterial and SPS https://www.babylonjs-playground.com/#2322Y7#24
You might want to make the basic mesh less spherical.
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