![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3kTiH_KnI_3S_C2yXnWBRYjj3Ts2LjvPhZFAN0CTs0BUugYz8uGzxWemwgYHsbAhH0O2OPH1Xzr_f3i9fD2cIMK539QgAr0T82-_y1nZGy8ARXjHaWH1KCYP7K-Tpvz8V4ZoU-1Mq2Zo/s320/example.png)
For this image WeightLifter was used to create a vertex group with more weight on horizontal surface:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIrHeu-HnBvBXjftQ0P6dP3CT9_4Z0YVQopl_61nj6S0pRYf3EQUk6s4RRyBYJydhcKs-0QtzNl_rDM0yslIJ3058Cgw-LkQ0bPwUuirn7BjHXGcPmFkLpv6NVOdaNlJRo_r76H84MO6M/s320/vertex+group.png)
Then this vertex group was used to control the distribution of the hairs by selecting the gruop in the particle system settings:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiM-g2rMtZMenx05Emf2pimnr2vxvLkQD5mfcI-bcD3R2N_EGnaKKCgtIzTgD6NJ0GjoW2iDKA2hRtPtp0yIhL4PCDmpdCZmjZbYp0PBTAl1k4dhAKREnx8KncAFXyzhQ8RGh-O0EFMDyc/s320/density.png)
In the same manner WeightLifter was used to create vertex colors that change colors from left to right:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKxqKqwxEa6cvhWjAzWXUf2a3nE83Wv4SH4MymOvI3Iv4rz3iGkwXvkM_T_bdA6thjUCqJf0-5qmKILUlCCzKrPe-pbOskYrCYnrLbs1rUeMcbr6BE2IwfEc4JrsYkDPFjS-6aPCZDLgs/s320/vertex+colors.png)
A Cycles material was then created to use these vertex colors (via the Attribute node) to color the hairs
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHeJchK5HHnQcmcow9BLGwsyBt68ygzVUN_CW0K5Z8Mzyzm4RcmBWB19ovM_pqk8QndgqXasmz0Wb09IPiLea1WGhUVu4GUqNBp9O-6U5LDM53H4RkkrF-AwGqoLLDGlF8d_kD-Oyy2Ok/s320/hair+material.png)
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