# Substance 3D

### 1. Prepare Your Model

Before exporting, ensure all final textures and materials are applied. Review the geometry and material assignments in your project.

### 2. Reduce File Size (If Needed)

If your model exceeds 100 MB, you can reduce the file size within Substance 3D Painter:

**Lower texture resolution:**

1. Locate the texture set list in the sidebar.
2. Click the resolution setting for each texture set and choose a lower resolution from the dropdown.
3. Verify that reducing the resolution doesn't noticeably affect quality in the viewport.

**Remove unnecessary texture channels:**

1. Review your texture sets for channels that aren't essential — such as emissive, opacity, or height channels.
2. Remove unused channels to reduce the exported file size, since Substance generates textures for each channel during export.

### 3. Export Your Model

1. Go to **File > Export Textures** (or press **Ctrl+Shift+E**).
2. Configure the export settings:
   * **Output directory** — Choose your desired output folder.
   * **Output template** — Select **USDZ Apple AR** from the dropdown menu.
3. Click **Export** to begin the texture export process.

### Pre-Export Checklist

Before exporting, verify:

* All textures and materials are finalized
* Texture resolution is appropriate for your file size target
* Unused texture channels are removed
* Output template is set to USDZ Apple AR


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