Gradient

Gradient is a texture map that can easily create and edit gradients useful in many different situations.

Preset – Applies a gradient preset. When the gradient is manually changed, the Custom preset is automatically selected. 

Black/White
Red/ Green/ Blue 
Spectrum 
Custom

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. 
Diagonal – 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.

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

None – Disables the transition. 
Linear – Values are linearly interpolated in RGB color space.
Exponential Up – Values are exponentially interpolated from left to right, each color dominating the area between it and the next one.
Exponential Down – Values are exponentially interpolated from right to left, each color dominating the area between it and the previous one.
Smooth – Values are interpolated along a bell curve, each color dominating the region around it before blending to the next color
Bump – Values are interpolated along a sin curve, based on luminosity values.
Spike – Each color dominates only its immediate area, falling off shortly after.

Color – The color of the currently selected control point.

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

Amount – Controls the strength of the noise texture distortion.

Frequency – Controls the noise frequency. Smaller values make the noise pattern appear bigger and vice versa. 

Type – Controls how the texture is positioned on the geometry.

2D (UV Channel) – The texture uses the object UV coordinates.
Environment – This mode is applicable if the map is connected to an Environment slot or a Dome light.
Mapping Source – The texture uses an external UV placement source.

2D (UV Channel)

UV Channel/Set – Specifies the index of the mapping channel data to use. A value of 1 takes the first available channel. 

Repeat U/V – Determines how many times the texture is repeated in the 0 to 1 UV square.

Lock U/V Repeat – Locks the U/V Repeat.

Offset U/V – Controls the texture offset in the U and V direction. 

Rotate – Rotates the texture (in degrees). 

Tile U/V – Tiles the texture in the U and V direction. If the option is disabled, the Default texture color is used outside the 0 to 1 UV square. Default color is found in Parameters > Color Manipulation.

Mirror U/V  – Mirrors the texture in the U and V direction separately. The option cuts the texture in the half flipping one side vertically or horizontally. This can be used to avoid seams in-between non-tileable repeated textures. 

Environment

Mapping – Specifies the type and shape of the texture.

Angular
Cubic
Spherical
Mirror Ball
Screen

Rotate H – Rotates the environment sphere horizontally. 

Flip H – Flips the environment sphere horizontally.  

Rotate V – Rotates the environment sphere vertically.

Flip V – Flips the environment sphere vertically. This option is active only in Spherical Mapping. 

Ground – Enables ground projection of the texture.  

Position X/Y/Z – Offsets the ground projection along the X/Y/Z axis. 

Radius – Specifies a projection radius. Can be used to control the scale of the projection.  

2d Transformation – see 2D (UV channel) parameters.

Mapping Source

UV Placement Source – External UV placement source to be used for the texture placement.

2D (UV Channel)

Environment

Mapping Placement