[BUG] Sky Manager

[gchoqueux]

Your Environment

• Version used: next
• Browser Name and version: Firefox 147.0.4
• Operating System and version: ubuntu 22.04 and Windows 11
• Link to your project: /examples/#view_3d_map

Context

If we enable isable realisticLighting, The globe view example starts with significant slowdowns, and the operating system freezes for about 2 seconds.

There is also a WebGL warning in the console: WebGL warning: drawElementsInstanced: Using format enabled by implicitly enabled extension: EXT_float_blend. For maximal portability enable it explicitly.

If we disable realisticLighting, both the performance issue and the console warning disappear.