Spherical grid coordinate systems
Progress has been better than expected and spheric grids are practically done. This is a good opportunity to take a look at the coordinate systems in spheric grids.
Spheric grid rendering
I have been working on the next type of grid: spheric grids. Think latitude and longitude like on Earth. Here is a GIF of a rendered grid rotating around its axis. Don't worry about the framerate, that's how the image was recorded to save space, the actual rotation is smooth as silk.