List_to_tree or Tree_to_list

Grasshopper
,
1

Hi guys,

CurveClosestPoint

Parameters

curve_id (guid): identifier of a curve object
point (point): sampling point

the CurveClosestPoint method takes only one point

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import rhinoscriptsyntax as rs
from ghpythonlib import treehelpers as ght
y = [(20,-10,0), (50,-10,0), (80,-10,0)]
a = rs.CurveClosestPoint(x, ght.list_to_tree(y))

(sorry for stupid question):
using list_to_tree or tree_to_list, it is not possible to have the same result as the selected def?

ps in Python but without using for loops

2

You can do this, but out of the box, there is not function in rhinoscriptsyntax that you can pass a list or or data tree of points to:

import rhinoscriptsyntax as rs
from ghpythonlib import treehelpers

points = [(20,-10,0), (50,-10,0), (80,-10,0)]
params = [rs.CurveClosestPoint(curve, pt) for pt in points]

The list comprehension will populate a list with closest point parameters for each point in points, but it uses a for each loop.

3

thanks @diff-arch great alternative, I like :+1:

so if I understand correctly there is no way to use List_to_tree or Tree_to_list in Py?

ps but one question: for sure it’s the way i used it that is wrong, but if they exist List_to_tree or Tree_to_list in Py means they can be used or wrong?

4

No, no, these functions are explicitly for use in GHPython, but they are mostly for converting input trees to nested lists and/or nested lists to output data trees.
If you want to call a certain function, you just need to provide it the expected data type. You can’t pass it a data tree, if the function requires a single point, like in your example above.

5

:+1: