V-Ray Swirl is a procedural texture that produces a radial swirling effect. Its effect looks similar to stirring two colors of paint together with a stick. Its parameters can be connected to texture maps if required.

Uvwgen – Allows a UWV modifier to be attached to determine the UVW placement of the texture.

Color1 – Controls the lighter color. 

Color2 – Controls the darker color. 

UV Noise Phase – Specifies the UV noise phase.

Swirl Intensity – Controls how much range of color can be seen in the swirl.  Higher values crush all colors in the texture to a highly contrasted version. While lower values produce more range, and eventually, very low values fade away almost completely. 

Color Contrast – Acts as a sort of threshold on the swirl to produce harder edges at high values and more color range at lower values.

Swirl Amount – Controls the amount of Color 2 that can be seen in the texture.

Constant Detail – The number of noise octaves used for the noise in the swirl. Larger values result in more detail but render slower.

Center X – Controls the position of the center of the swirl on the x-axis.

Center Y – Controls the position of the center of the swirl on the y-axis.

Random Seed – A number that can be used to differ between two instances of the texture.

Twist – Controls the tightness of the swirl.