RhinoCommon Rotation Syntax in Python?

Hi everyone,

I've recently been trying to learn python in order to automate some external functions from within grasshopper. As an exercise, I've been trying to translate a serpinski triangle script from C# to Python, but as they are two different languages, I've gotten stuck on a specific function.

I can already make a point within python by using Rhino.Geometry.Point3d(x, y, z), but I can't figure out how to use Rhino.Geometry.Transform.Rotation.

The below function takes an input of two Point3d objects (points a and b, in this case).

Two points are then found between the points-- 1/3 between the two and 2/3 between the two points (p1 and p2, respectively). What I am trying to do is rotate p2 about p1. I'm not sure where to introduce p2 into the function I made in order to do this.

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def PtB(a, b):
p1 = a + ((b - a) / 3)
p2 = a + (2 * (b - a) / 3)

Rhino.Geometry.Transform.Rotation(-math.pi / 3, Rhino.Geometry.Vector3d.ZAxis, p1)

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The way this is done in the C# script I am referencing is the following:

Transform trans = Transform.Rotation(-Math.PI / 3, Vector3d.ZAxis, p1)

p2.Transform(trans)

Does anyone have any tips?

Also, I've been working in grasshopper 1.0.0004 in Rhino 6 WIP since Rhino 5 crashes when I try to open the python script editor within the older version of grasshopper.

Attachments:

Serpinski Triangle Python Version.gh, 11 KB

Replies to This Discussion

Permalink Reply by Christian Gartland on September 21, 2016 at 1:36pm

Hi Marcus,

Thanks for the help. Unfortunately, I keep getting null results from using the method in the script you linked. Everything seems to go well until I have to actually apply the transformation (see screenshot and script below):

Thanks again for your help

Attachments:

Serpinski Triangle Python Version.gh, 9 KB

Permalink Reply by Christian Gartland on September 22, 2016 at 9:00am

Hmm, I removed the "p3 =", but I am still getting a null result. I finally reinstalled rhino and fixed ghpython and it doesn't work in the current stable release either, so I must be doing something wrong, but I can't figure out what it is

Permalink Reply by 筑梦NARUTO on September 22, 2016 at 10:02am