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The V-Ray UVWGenEnvironment node allows you to use Environment mapping within the Mat Network. 

UI path: ||mat Network|| > V-Ray > Texture: Mappings > V-Ray UV Environment

Mapping Type – Specifies the mapping type to use from the following:

Angular 
Cubic 
Spherical 
Mirror Ball 
Screen

Horizontal Flip – Enables or disables horizontal flipping.

Vertical Flip – Enables or disables vertical flipping.

Horizontal/ Vertical Rotation – Rotates the map horizontally/vertically.

Texture Rotation –

Wrap U / V / W – Specifies a wrapping mode for U / V / W from the following:

No Wrapping 
Wrap 
Mirror Tile

Crop U / V / W – Enables or disables cropping in the U / V / W direction.

DUVW Scale – Specifies an additional scale factor for the texture derivatives.

Ground – Enables or disables the ground plane option.

Ground Radius – When Ground is enabled, this specifies the radius of the ground.

Ground Position – When Ground is enabled, this specifies the coordinates for the ground.