Ramp Node

Type – Controls the direction and shape of the gradient ramp. Changing the Type does not affect the color and position of the control points.

V – A gradient changing along the V direction.
U – A gradient changing along the U direction.
(U+V)/2 – A gradient with a diagonal transition.
Radial – A gradient with a radial transition.
Circular – A gradient with a circular transition.
Box – A gradient with a box radial transition.
UV – A gradient changing along both U and V directions.
Four Corner – A gradient that transitions linearly between colors assigned to each corner.
Tartan – Creates a gradient with a plaid pattern.

Color – The color of the currently selected control point.

Interpolation – Changes the color interpolation method between the control points. Changing the option changes the color transition curve between the control points. 

Smooth
Cubic
Cubic Bias
Linear
Step
Blend

Knot Position – The float position of the currently selected control point.

Bias Position – Specifies the position of the blend between the currently selected color and its right counterpart. 50% is perfectly blended in the middle, higher values increase the amount of the current color, and lower values decrease its amount. The rightmost color in the ramp is not affected by this parameter.

Context – Allows the attachment of a Context node (UVW generator) to adjust the UVWs of the texture. For more information, visit the Context Nodes page.