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Surface coupling, air drag model

Recent updates are the following.

1) Air drag model is implemented based on part mesh models. Each mesh face produces a drag force and lifting force. Parts located near each other produce shielding effect. I.e. a part in front blocks air flow around a part behind.

2) An ability to attach parts to surfaces of other parts. From now on not only rocket staging-like connections are available but any arbitrary connections, see the screen shot and a video.

Download Ignition: a space sim game inspired by Kerbal Space Program and Simple Rockets
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