Ellipsoid stairs?

[Anonymous]

Is there any way to design a stair that follows an ellipsoid profile as opposed to a circular one?

[Erika Epstein]

Archicad's stair tool incorrectly breaks the ellipse into arc segments based on a circle. I've submitted bug reports on this, and still no solution. Interestingly, even GS's manual shows the bad results 🙂

[Anonymous]

Erika wrote:
Archicad's stair tool incorrectly breaks the ellipse into arc segments based on a circle. I've submitted bug reports on this, and still no solution. Interestingly, even GS's manual shows the bad results 🙂

Do you mean that it does it badly? True ellipses are not supported in any of the standard elements or GDL statements so approximation by arcs is to be expected. AFAIK the only alternative would be custom GDL code or primitives.

[Erika Epstein]

Matthew, it breaks the line of the 'ellipse' or 'oval' into segments of a circle's arc. Each time there is a new segment of arc, it starts with a new tread, truncating the last tread of the previous arc segment.

AC will break any line of a stair into arcs and straight lines and each section of arc or line will start with a new tread.