> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# BakeAmbientOcclusion - ComfyUI Built-in Node Documentation

> Bakes an ambient-occlusion map from a high-poly mesh into the UV layout of a low-poly mesh.

Bakes an ambient-occlusion map from a high-poly mesh into the UV layout of a low-poly mesh. The output is a grayscale image in which white texels are open and dark texels are in crevices; it is meant for the Apply Texture To Mesh node's occlusion input. Connect the UV-unwrapped low-poly mesh and the high-poly mesh it was decimated from.

## Inputs

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `low_poly` | The UV-unwrapped low-poly mesh to bake into. Must have UVs; the node raises an error if they are missing. | MESH | Yes | - |
| `high_poly` | The high-poly mesh that the low-poly was decimated from, used as the source geometry for occlusion. | MESH | Yes | - |
| `resolution` | Texture resolution in pixels; each texel receives an occlusion value. Default: 1024. | INT | Yes | 64 to 8192 (step 64) |
| `samples` | Rays per texel. More = smoother, slower. Raise if grainy. Default: 64. | INT | Yes | 4 to 1024 (step 4) |
| `max_distance` | Ray length, as a fraction of the bounding box diagonal. Smaller = tighter, more local occlusion. Default: 0.5. | FLOAT | Yes | 0.01 to 2.0 (step 0.01) |
| `strength` | Scales the occlusion. >1 darkens, \<1 lightens. Default: 1.0. | FLOAT | Yes | 0.0 to 2.0 (step 0.05) |
| `bias` | Ray origin lift off the surface, as a fraction of the bounding box diagonal. Raise if even surfaces show dark blotches/holes. Default: 0.01. | FLOAT | Yes | 0.0001 to 0.2 (step 0.0005) |

Note: `low_poly` must have UV coordinates — this node never unwraps the mesh. If `high_poly` contains only one batch item, it is reused for every batch item of `low_poly`; batch items of `low_poly` with no faces are skipped and replaced with an all-white image, with a warning logged. If the UVs of `low_poly` spill outside the 0-1 range, they are uniformly fitted back into it, and a warning is logged when a tiled/UDIM-style layout is detected.

## Outputs

| Output Name | Description | Data Type |
| - | - | - |
| `occlusion` | Grayscale ambient-occlusion image with values in \[0,1] (white = open, dark = crevices), one image per batch item of `low_poly`. Intended for the Apply Texture To Mesh node's occlusion input (packed into the ORM map / occlusionTexture). | IMAGE |

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/BakeAmbientOcclusion/en.md)

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