Steps shown
1. Convert .3ds file to .smf with AC3D
2. Reduce triangle count with QVis from 14207 to 1443
3. Convert .smf file to .ac with AC3D
4. Add .ac and texture to Xcode and edit to load new model
The texture was resized to 512x256 and the far value for glFrustumf changed from 10 to 100 before recording the screencast,
Skull model available from 3dm3.com