This official release thread for SweetFX contains all the information you might need. I have used SweetFX with many games in the past with great success, and look forward to seeing how KSP fares. From the SweetFX download page - "SweetFX is a universal image improvement and tweaking mod, that works with almost any 32-bit DirectX 9, 10 or 11 game or application." Just to clarify, SweetFX was not explicitly made to use with KSP/Unity nor is it the brainchild of any member of the KSP community. It is a Direct3D wrapper. I feel Squad should review this aspect of its modding policy, as SweetFX should not be considered a "plugin" for "KSP" as in reality it only offers "fancy game-specific shader configurations" for "the primary graphics driver of the Microsoft Windows operating system."
