vertex color questions!

Terrain Assets of the trees look more real!

In particular, leaves a very real!

I ask how to make. Well with vertex color?

Picture on the left tree, is made ​​in my 3DMAX. No sense of volume!

Ask how to make trees? Thank you! !

I 3DMAX in the tree vertex color!

But no effects into U3D!

Thank you, my English is not good!

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Unity import vertex colors for models, but you need to use shaders (or to write your own) which uses these colors.