Orient control points on planar surfaces?

DiegoKrause · April 12, 2021, 11:31pm

Hi, is there a way to orient or choose the direction of the control points in the command PlanarSrf?
I often have to make surface details and a practice I do a lot is to draw the shapes planar, then use PlanarSrf and then ChangeDegree to add more points and tweak it a little:

I think it would be great if one can just orient the “structure” or something like that so the new points flows with the shape.

Thanks for your time.

pascal · April 13, 2021, 12:23am

I’ll see if I can make you something, I might even have a planar surface orienter someplace.

@DiegoKrause - see if this is ok for a start - it works on planar surfaces and brep faces.

gist.github.com

https://gist.github.com/pgolay/f1db284bfa9d59997321e1190dcdcaa9

PlanarFaceDirection.py

import Rhino
import scriptcontext as sc
import rhinoscriptsyntax as rs
import System
import math


def PlaneAlignedBB(geo, plane):

    wxy = Rhino.Geometry.Plane.WorldXY

This file has been truncated. show original

@DiegoKrause - updated to work on planar surfaces with holes…
@DiegoKrause - updated to work on brep faces

To use the Python script use RunPythonScript, or a macro:

_-RunPythonScript "Full path to py file inside double-quotes"

-Pascal

martinsiegrist · April 13, 2021, 5:43am

The option to choose in which C-Plane the command PlanarSrf should build the surface would be nice.

In that case you could simply create a custom C-Plane and create the surface

DiegoKrause · April 13, 2021, 6:00am

awesome!
thanks so much
it works exactly as I imagined it

pascal · April 13, 2021, 2:35pm

OK. There is a bit more to do - holes are ignored at the moment, for example. (fixed, above)

-Pascal