Belamir

parameters

>floor height (variable)

-2800mm<4000mm

>rise height

-rise height=floor height/20

>tread width

-tread width=470mm

functions

>step height

-translate(step n)= n*'step height'

-rotate(step n)= n*15deg

>double helix

-height= 'floor height'

-pitch=6/5*'floor height'

>handrail

-draft/angle= atan ('rise height'/ 'tread depth')