Examples: the hillshading zenith slider does not work

Summary

Steps to reproduce

1. Open the hillshading example
2. Move the zenith slider

Expected behaviour:

The zenith of the light changes.

Actual behaviour:

Nothing changes.

Informations

• Giro3D version: 0.35
• Browser (Firefox, Chrome, Opera, Safari...) and version: N/A
• OS (Linux, MacOS, Windows...) N/A

Screenshots