Added scriptable method to replace textures on-the-fly

[alex-w]

Description

I've added 2 scriptable methods for SolarSystem class to ability replacing planetary textures on-the-fly in scripts. The method setTextureForPlanet(planetName, texName); replace the texture for object with name planetName. The method resetTextures(planetName); loaded default texture for object with name planetName. In latest method parameter planetName can be empty - in this case default textures will be loaded for all solar system bodies.

Fixes #1060 (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update

How Has This Been Tested?

Please unpack archive texture_test.zip into scripts directory and run the script texture.ssc within Stellarium

Checklist:

• My code follows the code style of this project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching src/**/*.cpp:

• Are possibly unused includes removed?

This is an automatically generated QA checklist based on modified files

[gzotti]

Very nice!
I tried to exchange Venus clouds by the surface features. The texture path has to start in the scripting dir, right? Maybe we could (later!) add built-in alternative textures for Earth (cloudless), Mars (drawing?), Venus (surface features). This is a marvellous tool to put historical maps on the planets!
For me it seems to be OK.

[alex-w]

Very nice! I tried to exchange Venus clouds by the surface features. The texture path has to start in the scripting dir, right?

Yes, this is correct

Maybe we could (later!) add built-in alternative textures for Earth (cloudless), Mars (drawing?), Venus (surface features). This is a marvellous tool to put historical maps on the planets! For me it seems to be OK.

In future maybe :) For example the process of changing the texture can be with fading effect.

OK, I'll merge it and prepare the second release candidate to version 0.21.3 :)

[github-actions]

Hello @alex-w! Please check the fresh version (development snapshot) of Stellarium:
https://github.com/Stellarium/stellarium-data/releases/tag/weekly-snapshot

[github-actions]

Hello @alex-w! Please check the latest stable version of Stellarium:
https://github.com/Stellarium/stellarium/releases/latest