v0.5.0 Skybox support!

Added

• Support for Skyboxes. If no skybox is found (or the skybox texture fails to load) then it falls back to the old estimation.

Fixed

• 3D raycasts are no longer incorrectly offset by the topbar. ScreenPointToRay vs ViewportPointToRay, a classic blunder.

Full Changelog: v0.4.1...v0.5.0