That is not a mystery ... Clockwise vs Counter clockwise reverses the polarity of not just ceilings but several other elements in Revit... (unfortunately Autodesk did not include that in any manual)
When sketching the ceiling Counter Clockwise, place and check the Slop arrow settings (Offsets at Tail and at Head)...you will notice that they are functioning in a reversed manner (The offset given at tail is applied at the head and it offsets downwards)
A similar principle apply also reference planes and adaptive points
Ok, not sure why the images didn’t come through but lets try again:
Hopefully the images are above.
And to clarify, this is a single ceiling created by sketch with one edge set as slope defining (Not using slope direction arrow) – once created I simply selected it and swapped to the second type and it jumps.
I understand the this can occur when sketching it different directions however there was only 1 sketch done in this case.
I just wanted to test if this was actually a thing or just just an old revit users tale.
This was done in the default construction template. Sketch 2 ceilings, Level 1 was sketched counter-clockwise, Level 2 was sketched clockwise. When their types are changed to compound, the height calculation point for level 1 changes. When I edit the sketch after making the change it still looks the same.
Can anyone explain why this happens? Often there is a reason for these things but this has me stumped.
