extract first frame of each source video tile
skeleton
source to sequences
create SourceTile's
stuff hah.
calculating zoomed in grid size
calculate max zoom
iterate base tiles
bounds stuff
starting intersects
source tiles per dest base tile
base tiles look legit
higher zoom render skeleton
higher level render skeleton
render tile set
almost rendering a lower zoom tile
first lower zoom level looks good!
rendering all levels but may have bug
excellent
all frames