When I added the ground-texture code I left the comment as
multiple JS-line-comments ('// Horizon...') between strings.
Those are NOT inside any string, so JS sees:
'// Horizon: ... satellite <- opens string, never closes
// ground texture ... <- JS thinks these are line comments
...
The string stays open until the next ',, then the next string
line parses as a continuation of an unterminated string and the
whole file is rejected. Wrap the comment into one quoted string.
Richard Zink
40fcea0548