I Try Make A Thing In Hair Particle System

I want to try make like this. This is use hair particle system make a simple thing in blender, this is interesting~ :)

我想尝试做类似这个。这是使用Blender的Hair Particle System来做一个简单的东西，这很有趣~ :)

Render result, 1920 X 1080, 200 samples, 7 min 29 sec.

The shader node I follow the nodes set, and also follow set the Cycles Hair Rendering and Cycles Hair Setting. But after I has encountered a problem is the hair distribution range. Then I think can use vertex group control the distribution range. So I create the vertex group for the Hair Particle System's Density and Length.

I add another Plane because I want to make the thing in the ground has real sense.

这个Shader Node我是跟着他的Node set，同时跟着设置Cycles Hair Rendering和Cycles Hair Setting。但这之后我遇到了一个问题是Hair Particle的分布范围。之后我想到能够用Vertex Group来控制分布范围。因此我做了Vertex Group给Hair Particle System的Density和Length。

我添加另一个Plane是因为我想做这个东西是在地面上有实在感。

Overall

Vertex Group for the hair particle distribution range