> For the complete documentation index, see [llms.txt](https://interopxyz.gitbook.io/three-plus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://interopxyz.gitbook.io/three-plus/components/materials/material-maps/volumetric-map.md).

# Volumetric Map

Apply a Volumetric Map

## Description

Apply a Volumetric Map to a material

{% tabs %}
{% tab title="Preview" %}
![](https://2542354621-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbH1SBOktQqL8caPM2Xpc%2Fuploads%2Fkc6sOffXrpDgTSCCaKCF%2FMaterials-Map-Volume.png?alt=media\&token=4b0fe48a-b166-4723-85b7-ec37b72f25a3)
{% endtab %}

{% tab title="Location" %}
**Name** | Volumetric Maps

**Nickname** | Volumetric

**Tab** | ThreeJs

**Panel** | Materials

**Division** | 5
{% endtab %}

{% tab title="Inputs" %}
**M** | **Model Element** (*T+ Model*) | A Three Plus Model, Mesh, or Brep

**Tm** | **Transmission Map** (*Bitmap*) | The red channel of this texture is multiplied against .transmission, for per-pixel control over optical transparency. (A System Drawing Bitmap or full file path to an image.)

**T** | **Transmission** (*Number*) | The effect factor between 0-1.0.

**I** | **IOR** (*Number*) | Index-of-refraction for non-metallic materials, from 1.0-2.333. Default is 1.5.

**R** | **Refraction Ratio** (*Number*) | The index of refraction (IOR) of air (approximately 1) divided by the index of refraction of the material from 0-1.0.
{% endtab %}

{% tab title="Ouputs" %}
**M** | **Model Element** (*T+ Model*) | The updated Three Plus Model Element
{% endtab %}

{% tab title="Mode" %}
*none*
{% endtab %}
{% endtabs %}

## Usage