Sky is very glitchy?

[Vastar]

This is a known Mac issue. The devs are at it.
Some people with the same issue reported that switching to the latest test branch fixed this issue for them.
You can do this by following these steps:

@james

Instructions for accessing the C++ Steam beta testing build of Boundless.

Start Steam Client
Enable the beta:
Boundless -> Properties -> BETAS -> “Enter beta access code…”
Enter: xDSIHmYGVDhLQivY

“Select the beta you would like to opt into:” -> “cplusplus -”
Close

Start the beta:
Select “Play” on Boundless.
On Windows: “Launch C++”
On OS X: “Play Boundless”
Select “PLAY”