---
title: "Add to Object Buffer"
url: "https://help.maxon.net/c4d/en-us/Content/html/TCOMPOSITING-COMPOSITINGTAG_GROUPOBJBUFFER.html"
section_path: "Object Manager > Tags Menu > Render Tags > Compositing Tag > Add to Object Buffer"
element_id: "TCOMPOSITING"
group_id: "COMPOSITINGTAG_GROUPOBJBUFFER"
description: "Use this page to specify up to 12 object Buffer IDs for the object. These object channels correspond to the object channels defined in the Multi-Pass …"
---

## Add to Object Buffer

Use this page to specify up to 12 object Buffer IDs for the object. These object channels correspond to the object channels defined in the Multi-Pass setting's **Channel** menu.

Let's say you activate a **Compositing** tag in the **Channel** tab for a given object and assign it ID **1**. If you subsequently define an object channel in the Multi-Pass settings with an ID of **1**, an alpha channel will be created that matches the object. This method can be used to create any number of alpha channels.

An ID of **1** can also be assigned to other objects, letting you combine a wide variety of objects that can be output as alpha channels. Refer to the [Multi-Pass](https://help.maxon.net/c4d/en-us/Content/html/DRENDERSETTINGS-RDATA_GROUP_MULTIPASS.html.md) chapter for more details.

> **Tip:** Tip:Even though 12 **Buffer** IDs per object are available by default, additional Buffer/object IDs in excess of 12 can be defined. Simply enter the desired number (e.g., 587) in the respective **Buffer** field. This makes it possible to, for example, assign 20 different objects various amounts of Buffer/object IDs.

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN0`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN0` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN1`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN1` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN2`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN2` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN3`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN3` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN4`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN4` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN5`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN5` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN6`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN6` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN7`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN7` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN8`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN8` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN9`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN9` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN10`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN10` · Range: [1..10000]

### Enable

Parameter ID: `COMPOSITINGTAG_ENABLECHN11`

### Buffer

Parameter ID: `COMPOSITINGTAG_IDCHN11` · Range: [1..10000]