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Creating GLB files using Blender and Substance Painter

Use Blender and Substance Painter to export a GLB file that can be uploaded to 3D Warehouse.

Prepare your model for export in Blender

To prepare your model for export, you need to make sure that it's a single mesh and that it has a single texture applied to it.

Steps:

  1. Click File > Import and then select the correct file format for your model.
  2. Select your model file, and then click Import.
  3. While holding SHIFT, right click each object in your scene, and then press Ctrl + J to join them into one mesh.
  4. Unwrap the model into 0-1 UV space. Make sure that no UVs overlap:
    In the UV/Image Editor, make sure that all the UVs are laid out on the grid.
  5. In the Properties editor, click the materials icon.
  6. Click the + button to add a new material slot:
    The 'Add a material slot' button is near the top of the 'Material' pane.
  7. Click New.

Export the mesh from Blender

  1. Click File > Export > FBX (.fbx).
  2. Enter the path to where you want to export the file.
  3. Make sure that you use the following export settings:
    Version: FBX 7.4 binary. Scale: 1.0. Apply Scalings: All Local. Forward: -Z Forward. Up: Y Up. Path Mode: Auto. Batch Mode: Off.
  4. Click Export FBX.

Import and prepare the FBX file in Substance Painter

  1. Create a new Substance Painter project by clicking File > New.
  2. In the New project dialog, click Select to choose a mesh.
  3. Select the FBX file that you exported from Blender, and then click Open.
  4. In the New project window, click OK.
  5. Verify that you correctly exported your mesh by checking that there's only one texture set in the Texture set list panel.

    If you see more than one texture set, then see Multiple texture sets.

  6. In the Texture set settings panel, click the + button to add channels:

    The + button is beside the Channels heading. The button opens a drop-down menu that shows the additional channels that are available.

    • Required: Ambient occlusion.
    • Optional: Emissive. Add this channel if your model has components that will emit light.
    • Optional: Opacity. Add this channel if your model has components that will be transparent.
  7. In the Texture set settings panel, click Bake Mesh Maps.

  8. Paint textures on to the model.

Multiple texture sets

When you import the FBX file into Substance Painter, you should see only one texture set:

Texture sets are listed in the Texture set list panel.

If you see more than one texture set, then one of the following was wrong when the mesh was exported from Blender:

  • The mesh wasn't combined into a single object.
  • The mesh had more than one texture assigned to it.

If that's the case, then export your model from Blender again and make sure that the mesh is a single object and has only a single texture assigned to it.

Export the glTF file from Substance Painter

  1. Click File > Export Textures.
  2. From the Config drop-down menu, select glTF PBR Metal Roughness.
  3. Choose the location where you want to save your textures.
  4. Choose a document size to determine how large the texture files will be.

  5. Click Export.

Compressing texture files

When you have exported the model, you should have the following files:

  • modelName.bin
  • modelName.glb
  • modelName.gltf
  • modelNamebaseColor.png
  • modelNamenormal.png
  • modelName_occlusionRoughnessMetallic.png

When using the glTF PBR Metal Roughness configuration, Substance Painter exports texture files only in PNG format. Consider compressing the texture files and converting any textures that don't need an alpha channel to a JPG. This reduces the total file size, and smaller file sizes allow for quicker download speeds and smoother interactions.

It's best to keep your file size to 3MB or smaller.

Create a GLB file

  1. Visit https://glb-packer.glitch.me/.
  2. Drag and drop the files that you exported from Substance Painter on to the GLB Packer web page.

A file called out.glb will be downloaded to your computer. After the download is complete, you can rename the file and then upload it to 3D Warehouse.

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