---
title: "Ramp"
url: "https://help.maxon.net/r3d/cinema/en-us/Content/html/Ramp.html"
section_path: "Shaders > Texture Shaders > Ramp"
description: "This shader node maps an input coordinate between to a color gradient. If you need to output just a float value, have a look at the Scalar Ramp instead."
---

# Ramp

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# Ramp

## Introduction

This shader node maps an input coordinate between to a color gradient. If you need to output just a float value, have a look at the [Scalar Ramp](https://help.maxon.net/r3d/cinema/en-us/Content/html/Scalar_Ramp.html.md) instead.

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| ![Image: C4D_rsRamp_UI.png](https://help.maxon.net/r3d/cinema/en-us/Content/Resources/Images/C4D_rsRamp_UI.png) |
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## Parameters

### Input

#### Texture Space

This is the name of the UV coordinate map on the surface that will index the color ramp, when the Source option is set to 'UV Map'.

#### Source

This option determines the source of the coordinate that will index the color ramp.

- UV Map - the coordinate is defined by a uv coordinate map on the object
- Alt - the coordinate is defined by the Alt Input value
- Auto - the default setting. If the inputs for *Alt Input* and *Texture Space* are both not configured, the standard UV map will be used instead. If one othe the inputs is configured, it will be used automatically as source.

#### Alt Input

The scalar coordinate value that will index the color ramp when Source is set to 'Alt'.

#### Mapping

This option remaps a uv coordinate input to a scalar coordinate in preparation for indexing the color ramp, when Source is 'UV Map'.

- Horizontal - the u component of the uv coordinate is used
- Vertical - the v component of the uv coordinate is used
- Diagonal - the average of the u and v components is used
- Radial - the angle between the u and v components is used, mapped to 0-1
- Circular - the hypotenuse of the u and v components is used

##### UV Context

Connect a UV Context Projection node here to enable a local connection for simplified texture mapping. For more information, please see the [UV Context Projection page](https://help.maxon.net/r3d/cinema/en-us/Content/html/UV%2BContext%2BProjection.html.md).

### Adjust

#### Exposure

Increases or decreases how a ramp is mapped in a similar fashion to increasing or decreasing light exposure. This is a helpful parameter to adjust when setting up tone mapping with a Toon material.

#### Old Range Min and Max

Controls the input range of the ramp.

#### New Range Min and Max

Controls the output range of the ramp.

#### Invert

Enabling this option inverts the computed coordinate that will be used to index the color ramp.

#### Noise Amount

This scales the amount of noise that will be applied to the ramp coordinate to add variation to the texture. A value of 0.0 means no noise is applied, with higher values meaning stronger noise.

#### Noise Frequency

This scales the noise effect applied to the ramp coordinate, with higher values resulting in higher frequency noise.

### Ramp

#### Ramp

This is the color ramp itself. Here knots can be added, removed, and repositioned at different points along the ramp and each knot can represent a different color.

#### Interpolation Type

Controls the interpolation type for ramp colors.

#### Knot Position

Controls where the knot is located in the ramp.

#### Bias Position

Controls where the transition occurs between knots.