1.0.4 Cargo bays drag glitch (only when it's a root part!)

[Nao]

Noticed recently that >randomly< on game launch or moving the mk3 cargo bay doors, they loose it's drag value, if that happens usually the parts connected by stack in front and at the rear of the bay gain a bunch of drag. But after just opening and closing the bay it's possible for all 3 parts to loose drag altogether or worse one of the pars starts getting massive drag while others sit at zero.

examples:

the large holding tank is inside the bay to note that parts inside are shielded

other cases fromthe same design - two small mods were installed but i did test later on completely stock install (used in the above picture and the more indepth description mentioned later) and it worked the same way:

- drag completely gone from bay, it's contents and two adjacent mk3 parts

- some time later same flight after opening and closing the doors - one of the parts get 250 points of drag.

Here is the craft link: https://www.dropbox.com/s/vjr0jf6rfo3j3jz/cargo%20bay%20bug.craft?dl=0

What happens usually:

On first load everything is fine - then moving cargo bay can disable drag on stack connected adjacent parts - after that if we revert flight to runway the cargo bay loose drag value from the start, and moving doors start to do more random glitching (adjacent parts can gain or loose drag).

Notable things that can be causing this: the cargo bay have two docking ports inside (stack connection), removing one of them changes the glitch behavior, removing both fixes it for first launch - if the revert is used, it's possible to get the bug without any parts inside.

edit: after a suggestion from other forum member, i tried renaming physics.cfg file, the new file is different (i was on a stock install earlier... so idk why), but the bug in question prevails.

Edited June 26, 2015 by Nao

[Nao]

An update, the cargo bay part needs to be a root for this to happen. It's possible to induce that in other crafts that are normally fine just by changing the root part.

[Rune]

An update, the cargo bay part needs to be a root for this to happen. It's possible to induce that in other crafts that are normally fine just by changing the root part.

Yeah... not so sure about that. I'll have to check, but the other day I had one whole wing occluded during reentry on a Spatha (it was a bigS delta, and nowhere near inside the bay, just attached to it). Fixed it by cycling the bay open/close. I'll try to reproduce, but there was also a payload with a Klaw badly clipped in the bay, so that may have had something to do and maybe I won't be able to.

So yeah, I don't bring much info to remove the bug, but I have a workaround: if your plane starts to act wonky, turn on the aerodynamic overlay to check whether all your surfaces are generating lift, and if some aren't, cycle the doors to fix it.

Rune. Every new 1.0x version brings new and amazing bugs. Thank Kod we had a beta version, right?