The following steps describe the recommended pipeline for preparing bag models in Blender for WANNA VTO.

1. Install the Add-on

• Download the script: WANNA_Bag_Fitting_v0.2.py  
• Open Blender Preferences: Edit → Preferences → Add-ons
• Click Install and select WANNA_Bag_Fitting_v0.2.py.
• Enable the add-on.

2. Import Bag and Avatar

• Import your bag model (.gltf or .glb).
• Download and import the official WANNA Avatar.
• Ensure both bag and avatar are located at World Origin.

3. Create or Adjust Strap

• Either model a new strap or straighten an existing strap.
• Strap must be aligned along the X-axis, with the origin at World Origin.
• Default strap length for adjustable bags: 100 cm.
• Name the strap node strap_long.
• Ensure fittings at strap ends are merged into the strap_long node.

4. Position the Bag Body

• Bag body must be named main.
• Align the model so that the bottom touches Z=0, and it is centred along X and Y.
• Check that all components are positioned realistically under gravity.

5. Use the Add-on to Fit Strap

• With the add-on enabled, select the strap path and avatar.
• The script generates an example strap length (100 cm).

• Choose strap placement type (crossbody or straight; left or right side).

• Adjust strap placement manually if needed using curves. Make a strap that fits close to the avatar.

6. Texture Adjustments

• If you are using a model that was originally created for the 3D Viewer, check Ambient Occlusion (AO) and fix it if necessary:
  • Black artefacts in the ORM map can be corrected in Photoshop or Blender by editing the red channel.
  • Required maps: Base Colour, Normal, ORM (PNG, 2048×2048).

7. Export

• Apply all modifiers and transforms.
• Ensure the model contains only two nodes: main (bag body) and strap_long (strap).
• Export to glTF with associated .bin and textures.
• Name the file according to product ID and placement - see Bags 3D Model Requirements (VTO).

8. Upload to WANNA Studio

• Package .gltf, .bin, and textures into a .zip.
• Upload to WANNA Studio - learn more about Working with WANNA Studio.
• Select the Female avatar.