This Blender 3D addon let you to make a snow mesh into your 3D scene.
The addon can be get from github website and is make by 3DMish.
The addon come with few settings to set up the size of the mesh and the material of snow.
Just select your object and use this tool to make the snow.
Note: To use this addon you need to set 3D window from Object Mode, select the object and press the Create snow button.
