Rendering 3d globes and terrain

[obsgolem]

This is a major missing item in the WGPU and Rust space IMO. There are lots of complexities here, such as

• Hierarchical LOD, with LOD selection based on screen space error
• Handling cracks
• Mapping textures at different LOD than the underlying geometry
• Floating point artifacts due to the scale of the earth
• Zooming logic: do you zoom based on altitude or zoom to cursor? How do you make zoom to cursor not janky?
• Combining multiple layers of both imagery and terrain

Cesium appears to be state of the art in a lot of these areas, so referencing their code would probably be wise.
This is a good article I found on how they handle floating point artifacts. The book 3D Engine Design for Virtual Globes appears to have a lot of good info as well. Also, Unreal's Nanite LOD tech might be a good reference to improve significantly on state of the art for terrain rendering.

[Maximkaaa]

Related to #2