Detailing Radiused Stair Coping...

Let me explain the situation first:
I am detailing coping that runs along the top of a radiused wall.
The radiused wall is semi-circular, and it also decreases in elevation from beginning to finish.
Kind of like a portion of a spiral staircase with coping on top.
I know that you should be able to shoot a horizontal line across the top of the coping from the center of
the semi-circle, and it should be level across the top of that coping.
Which means there should be a slight twist in each piece.
Now, with that being said, how do you determine the amount of twist in each piece?
Or, is there a way to determine this?

Andy

 

Can I ask why you need to know?
I think most materials would form to the correct shape as you fix them down.
And what units is the answer in? degrees of twist per degree of rotation
perhaps?
If you model a 1 degree segment of the coping by extruding along a path. You
could project it onto a plane perpendicular to one end, then measure the
difference in angle between the top edge of the front face & the top edge of
the back face. It wouldn't be exactly exact, but pretty close I think.
I cant try it out cos I'm at home.


Let me explain the situation first:
I am detailing coping that runs along the top of a radiused wall.
The radiused wall is semi-circular, and it also decreases in elevation from
beginning to finish.
Kind of like a portion of a spiral staircase with coping on top.
I know that you should be able to shoot a horizontal line across the top of
the coping from the center of
the semi-circle, and it should be level across the top of that coping.
Which means there should be a slight twist in each piece.
Now, with that being said, how do you determine the amount of twist in each
piece?
Or, is there a way to determine this?

Andy