---
title: "Parameters"
url: "https://help.maxon.net/c4d/en-us/Content/html/GVVERTEXCOLORMAP-ID_GVPORTS.html"
section_path: "XPresso > XPresso Nodes > General > Vertex Color Operator > Parameters"
element_id: "GVVERTEXCOLORMAP"
group_id: "ID_GVPORTS"
description: "Connect the respective Vertex Color tag whose data should be read or set here."
---

## Parameters

### Tag

Parameter ID: `GV_VERTEXCOLORMAP_INPUT_TAG`

Connect the respective Vertex Color tag whose data should be read or set here.

### Index

Parameter ID: `GV_VERTEXCOLORMAP_INPUT_INDEX` · Range: [-2147483648..2147483647]

![Image: 040409.jpg](https://help.maxon.net/c4d/en-us/Content/Resources/Images/040409.jpg)

Internally, all object vertices are numbered consecutively (beginning with 0). This index number can be used to read or set the color or alpha value of the respective vertex. In the image above, for example, the first vertex was assigned a random color using the **Constant** node.

### Alpha

Parameter ID: `GV_VERTEXCOLORMAP_INPUT_VALUE_ALPHA` · Range: [-∞..+∞]

An alpha value (Type **Real**, 0=black, 1=white, grayscale for in-between values) can be fed into this input port.

### Color

Parameter ID: `GV_VERTEXCOLORMAP_INPUT_VALUE_COLOR` · Range: [XYZ ]

Any color can be fed into this node that will be used to color a vertex.

### Color

Parameter ID: `GV_VERTEXCOLORMAP_OUTPUT_VALUE_COLOR` · Range: [XYZ ]

This output port contains the color of the vertex defined by the **Index** port.

### Alpha

Parameter ID: `GV_VERTEXCOLORMAP_OUTPUT_VALUE_ALPHA` · Range: [-∞..+∞]

This port defines the alpha value of the point defined by the **Index** node.

### Count

Parameter ID: `GV_VERTEXCOLORMAP_OUTPUT_COUNT` · Range: [-2147483648..2147483647]

The point count for the tag assigned to the object is displayed here.