[Stellarium-pubdevel] Landscape improvements

[Georg Z. <geo...@un...>]

Dear all,

I have started a few amendments to the landscapes. So far, drawing fog is
now available for spherical and fisheye panos, and a little surprise for
light-polluted sites as well. It is now possible to clip away (the usually
transparent) upper parts of spherical landscapes to save texture memory.
Also, I try to improve the documentation of whatever code I stumble over
in my attempt to understand it.

There is one landscape type request here:

https://blueprints.launchpad.net/stellarium/+spec/landscape-custom-horizon

I have the feeling it can be done with the StelSkyPolygon class, or
something including StelSphereGeometry, or OctahedronPolygon, or a sibling
to StelSkyPolygon (drawing in Alt-Az coords), but I don't see those
classes used anywhere in the program. Are they brand-new, some stuck
development that never went into proper use, or so old that they are
deprecated? Any usage examples in a plugin I was not aware of?

Kind regards,
Georg