rotating a list of planes

Hey Everyone,

I'm having trouble rotating multiple planes and then outputting them as a list of rotated planes. Rotating just one set to item access works fine:

x.Rotate(y, New Vector3d(0, 0, 1))

a = x

But when I set the access type to list and try to rotate and output the first item in the list nothing seems to happen:

x(0).Rotate(y, New Vector3d(0, 0, 1))

a = x(0)

I've been searching the forums and it sounds like maybe I need to duplicate these planes before rotating them and then add them to a new list. I'm not sure how to duplicate them but here's me trying to add them to a list rather than output X directly:

Dim plnList As New list (Of plane)

For i As Integer = 0 To x.Count - 1
x(i).Rotate(y, New Vector3d(0, 0, 1))
plnList.add(x(i))
Next

a = plnList

But that didn't work either. I also saw that someone used transform(transform.rotation,,,) but that was to rotate a list of curves, and I'm not sure if that works for planes

Any help is appreciated

thanks,

Brian

Replies to This Discussion

Permalink Reply by David Rutten on May 27, 2012 at 2:16am

Planes are structs (Value Types, not Reference Types). So when you ask a list of Planes for an element, you get a copy of that element. In effect, this line:

x(0).Rotate(y, New Vector3d(0, 0, 1))

rotates only a copy. You need to so something like:

Dim plane As Plane = x(i)

plane.Rotate(y, Vector3d.ZAxis)

x(i) = plane

I know this split between structs and classes can be annoying, but the performance benefits we get out of it in RhinoCommon are worth it I think.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Brian Harms on May 27, 2012 at 3:45am

Perfect, thanks a lot David.

-Brian

Permalink Reply by Armano Papageorge on September 7, 2017 at 6:08pm

I've got quite a tricky issue.

I need all of the planes shown to all face the same direction. However I have two variables that add lines in the x and y direction. And for some reason whenever I do so, there are a few rogue planes that randomly rotate. I do know how to rotate them back into place, however the issue is that some planes rotate at complete random as far as I can tell. If there were a pattern it would be an easy fix but I don't believe there is.

I've highlighted the planes that have randomly rotated.

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