Has anybody got a solution for this? It has been a several years now. Why does it still occur? I know there is a work-around by editing the type parameters to show negative values however this is extremely tedious. Whenever i edit the original mass surface, (eg. shift an edge) the sloped glazing/curtain system flips it's orientation. There seems to be now logic or consistency in the way it does this... I this a bug? (if so why has it taken so long for autodesk to fix). Or is the a particular way to edit the mass surfaces without flipping the attached sloped glazing/curtain system?
Try this: turn the reversed panel into a door, reverse the door swing, and then turn it back into the original type of panel. This has worked for me.
There are several alternatives of solutions.
I want to add something to he list above, today, because I am working on something like this.
5. The curtain system can be mirrored. Go to a section view, find a grid line and use it as an axis to mirror the curtain system.
I had similar issue with only one panel flipped in whole curtain wall wall. Solution was to edit the panel family and add flip control which lets me flip it to correct side. Fast and simple though I don't know why it happened (tried using door panel to flip the panel, change to different one and back and subdivide the panel - nothing helped).
Ran into this problem with a few panels on my curtain wall and used your solution and it worked. Thank you.
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