One rail sweep, getting distortion


#1

3rd ave handrail.3dm (481.9 KB)


#2

Under curvature analysis your sweep rail has all kinds of problems. There are breaks in tangency and overall lack of smoothness. The end result is your sweep gets built as a polysurface which is the tip off that there is something really wrong with the curves. The super close together knot intervals is another indicator when the surface isocurves are shown. I rebuilt your curve to fix the tangency, smoothed it and used setpt to align the points that needed to be. The end result is a smooth surface sweep.


#3

Hello,
Copy your red rail VERTICALLY to meet the midpoint of the bottom of your cross section (1)
Project your cross section on vertical plane (2)
Sweep line (2) along 2 rails: your red and (1)
Attached file where I have done it. Looks better, I think (blue surface)

3rd ave handrail sweep2.3dm (819.1 KB)


#4

Thankyou for your time, however as the railing twists through the helix, it is distorted as is seems to flatten and profile changes. Any solutions for this?


#5

Thank you for the adjustments, looks much better. I’m very new to rhino and don’t really fully understand what you did. Could you go into maybe more of a step by step sequence and also send the corrected rhino file. thanks BH


#6

You are right, the profile flattens and this is not acceptable. Attached better solution.

3rd ave handrail sweep2 corected.3dm (683.9 KB)