parallel ceiling to the sloped ceiling

[ocraM999]

I can not, if not for attempts and approximations acting with the arrow of inclination, to realize a countertop that, for reasons of acoustic absorption, must follow (parallely) the trend of a sloped ceiling.
It seems impossible to place a 'reference plan' or a 'work plan. . . '
Mar

 

[gfrank]

the slope of the ceiling can be inserted (using the tilt arrow) with a corner.
the precise value of the angle can be detected with an angle measure of the ceiling compared to the working plane (horizontal).
for the correct positioning of the countertop, in side view or section, with the move command it is possible to combine a point (of origin) common between countertop and ceiling, or to act on the offset measure from the reference plane (element property)

 

[ocraM999]

Thank you. .
but then what are the 'reference plan' or the 'work plan...' in the countertop design menu if it is not possible to set a tilted one?
Mar