Snow

Snow Tex – Controls the color of the snow.

Surface Tex – Controls the color of the surface.

Threshold – Controls which areas that will contain snow color.

Depth Decay – Controls the how deep the snow appears to be. 

Thickness –  Controls the thickness of the snow.

Threshold – Controls which areas that will contain snow color.

Depth Decay – Controls the how deep the snow appears to be.  Lower values treat the snow as more transparent.

Thickness – Controls the thickness of the snow. 

Use 3D Mapping – Enables or disables 3D mapping for the procedural texture. Note that his mode is not supported yet by the Hybrid (CUDA) engine. 

 Compatibility – Allows you to match the result of the texture in Blender to that in either 3ds Max or Maya. If Alpha From is set to Maya: 

3ds Max – The resulting alpha of the texture is the intensity of the texture.
Maya – The resulting alpha of the texture is the color luminescence.

Invert – When enabled inverts the colors in final result.

 Alpha From – Determines how the alpha of the result is calculated: 

Force 1.0 – Alpha is always 1.
Maya – Depends on the selected Compatibility option.
Self – The calculated alpha of the texture.

Invert Alpha –  Inverts the alpha channel if Invert is also enabled.

UV 

Placement – Select how to place the texture. 

Whole texture is valid
Crop
Place 

U – U coordinate of the texture sector.  

V – V coordinate of the texture sector.  

W – W coordinate of the texture sector.

H – Specifies the height of the texture sector. 

Tile U/ Tile V – Enable to choose between a horizontal or vertical tiling. 

UV noise on – Enables the noise.  

UV noise amount – Specifies the UV noise amount. 

UV noise levels – Specifies the UV noise iterations. 

UV noise size – Specifies the UV noise size.  

UV noise phase – Specifies the UV noise phase.  

Animate UV noise – If enabled, the noise is animated. Use the UV noise phase to animate the noise.