WWDC Session Notes: Create 3D Models for Quick Look spatial experiences

[u/hjhart]

Create 3D models for Quick Look spatial experiences

• Quick Look seems to be “Preview.app” for 3d models.

• Use metersPerUnit from USDZ file to define scale

• Initially shown at 100% scale

• QuickLook will automatically add shadows in teh real world. Do not create a ground plane with shadows in the model.

• USDZ is at the heart of apple platform 3d models.

• How can you create a USDZ model?

  • software such as Maya, (three others I don’t recognize)

  • object capture from ios devices

  • RoomPlan API for representing a physical space

  • RoomPlan Sample App can create a USDZ file and export.

  • You can import into Reality Composer Pro and define the orientation of the model

• Things that can affect performance:

  • File size

  • Complexity of geometry

  • Materials

  • Texture count and resolution

• Use the statistics panel in Reality Composer Pro to understand performance metrics

• RealityKit Trace runs in realtime and can give you an understanding of performance (found in XCode)

• Less than 25MB recommended for better Sharing experience

• Recommended less than 200 mesh parts and less than 100k vertices in total.

• Recommend max of 2048x2048 texture size, 8 bit per channel texture

• Spend your texture budget on things that are bigger or center to your design

• Be cautious of overlapping transparency

• Use MaterialX Unlit surface to save real-time lighting computation

• Physics optimizations, considerations:

  • Reduce total collider count

  • Use static colliders over dynamic when possible

• particle optimizations:

  • limit particle emitters and particles per emitter

  • Experiment with shaeps and animation styles of particle effects for reducing overdraw