Introduction

Once the 3D model of the watch is done, it needs to be positioned on a wrist to make sure it is displayed properly when the user's wrist is detected. One can do it using our wrist stub and instructions below. We use Blender to illustrate the idea, but it can be done in pretty much any modeling software.

Step by step instructions

Prepare the model

• Open the 3D model of the watch.
• Position them in the scene above XY plane along Y axis and place center of coordinates to the inner side of the watch strap, as shown on the picture below.

• If the 3D model was imported from Substance Painter, use Weld modifier with these settings to prepare model for adjustment.

• (optional) Use Clear Custom Split Normals Data to fix the normals if Weld from the previous step broke them.

• Separate geometries to be able to move strap pieces individually, using Separate → By Loose Parts

Position the watch

• Download wrist stub (WANNA_wrist_stub.fbx).
• Import that stub into the scene - you will be positioning watch around that wrist.
• Use Move and Rotate to adjust each link and make sure that the strap fits tight around the stub, but doesn't intersect with it.
• Do not move, rotate or scale the stub itself, it should stay in the same position all the time.

Export result and view in Studio

• Remove wrist stub from the scene.
• Apply all transforms using Object → Apply → All-Transforms.
• Export the positioned model without stub into glTF or glb file.
• Upload the exported file(s) to WANNA Studio and use generated QR code to verify that the position looks good.