Simple sweep 2rail twists but why?

Rhino Rhino for Windows
1

Hi,
V5
two triangles and two rails, done a dir and both rails heading same way, dir on triangles sees both same dir, so why does sweep2rail create a twisted shape ?
TWIST.3dm (25.8 KB)
Steve

2

My guess is you were in a viewport where the rails were oriented vertically.

image

Or Loft since the rails are straight:
image

3

Hi,
see attached, triangles are parallel on two edges, base is constant width on rails, I get that crazy twist, where in the storyboard do I go wrong ?
a sweep2rails should work here surely ?
need to click twice the attachment to see full screen in same size pixels it seems.

twist shape|240x500

Steve

4

Steve -

Right here:

image
image1407×551 90.4 KB

You need to make sure that these are aligned:
image

The command line asks you if you want to move the seam point and lets you flip the direction if necessary.
image
-wim

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