Rotating rectangles to align with vectors along curve

Grasshopper
,
1

I divided a curve and moved a rectangle to each point and tried to rotate the rectangles so the align perpendicular to the curve. My problem is that some of the rotation angles need to be negative for the orientation to be correct. You can see the problem along the first and last turn of the curve. I can’t seem to figure out how to call out the specific angles and make them negative while still keeping the script parametric. Please help!

Rotating Rectangles.gh (19.7 KB)

Rotating%20Rectangles
Rotating Rectangles.PNG812×532 5.58 KB

2

There are many other ways and this is one way.

Canvas%20at%2003%3B55%3B31
Canvas at 03;55;31.png990×504 89.3 KB

Rotating Rectangles_re.gh (8.4 KB)

2 Likes
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RotatingRectangles_2019Jul21a
RotatingRectangles_2019Jul21a.png904×305 7.74 KB

RotatingRectangles_2019Jul21a.gh (6.7 KB)

3 Likes
4

Thanks! This is exactly what I needed.