add ./build release, ./build debug
updated block texture
fix billboard block faces
Fix the packvector code, no need to pass through float here
fix the shader to match the pack format
track number of block types
updated block tesselation
simplify texcoord generation
shader with non-baked lighting enabled
Update OpenSimplex port to 1.1 and add 2D and 4D versions
NDEBUG
meh.