It seems that this foliage is made by geometric objects rather than textured planes.
But the density of the grass is so high,how to make that and it’s still with high performance?

And if 3rd party plug-in is used? The rpc and easynat is impossible due to their appearance of shade mode.

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Hmm...I think i saw a tut about creating grass like this in my “Deconstructing the Elements in 3ds Max, 2nd Ed” book that I bought last year, that tut used particles/hair and fur, I can’t remember which (I only glanced over the tut). If Viz can’t do hair and fur, then your best bet would be to use particles. Set the age to a high value (so they last along time) and speed to 0, so they don’t move from their spawn point.

Although, saying that, I’m not really an expert with particles (barely touched it actually)

My 3D work: here and here.

3ds Max 8 SP3 Educational Version (got it while in college)
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Win 7 Pro X64
Q6600 Intel 2.4GHz Quad Core CPU
8 GB DDR2 RAM
Samsung 400GB SATA2 Hard Drive
Asus Std Motherboard
ATI Radeon HD 3800 (I’m not sure how much memory this thing has now, dxdiag says it has 3GB, Sys info says 512MB....wierd)