Density computation error
Use glm::vec3
Define texture for precomputed inscattering
Move Skybox to the Shaders namespace
Define Atmosphere::GatheredLight
Update TODO
Again, fixed height computation
Change sunRGB definition. Abort Transmittance, if close to 0.
Use rounded indices when fetching precomputed values
Fixed bug in sun angle parameterization
Improved precomputed transmittance, 3D table
Define fetch function for precomputed transmittance
Transmittance precomputing bug fix
Change precomputed transmittance into 2D vector
Change transmittance calculations to 2D.

Steep vectors can't use precomputed transmittance.
Detect when nearest point is outside of the line pa to pb.
Better detectioj of low heights for FetchTransmittance
Use incremental distance change for single scattering
Add Octave math script
Fix bug in inverse sun angle parameterization