Feature: atmosphere shader

[smlpt]

Implements a dynamic atmosphere shader, based on the Nishita sky model. The code is ported from https://github.com/wwwtyro/glsl-atmosphere.
An example can be found in basic/AtmosphereExample.

• (dynamically hand over sun position data via @ShaderProperty)
• Implement key binds for sun position (via dragsphere behavior)
• write vertex shader for sunproxy sphere to disable translational movement circumvented dragbehavior with keybinds
• Synchronize a directional light to the sun position
• Create a default atmosphere object that can be imported to automatically set up an atmosphere
• Add an emission material property to the render pipeline so that the atmosphere object does not require to be lit by point lights
• Create vertex shader to to always put the icosphere in the background like a skybox (see learnopengl.com)
• local time to sun position
• update sun position with coroutine
• clean up code

[skalarproduktraum]

Thanks, only some minor stuff left 👍

[skalarproduktraum]

Thanks, @smlpt 👍