Problems with PlaneFromPoints?

[Silva]

Hello! Hello! Can you help me in this example script?
import rhinoscriptsyntax as rs

corners = rs.GetRectangle()

if corners:

rs.ViewCPlane( rs.PlaneFromPoints(corners[0], corners[1], corners[3]))

It gives:
Message: unable to coerce Origin=29.8916742188048,129.979956229813,0 XAxis=1,0,0, YAxis=0,1,0, ZAxis=0,0,1 into a view

Traceback:
line 16, in __viewhelper, "C:\Users\dotto\AppData\Roaming\McNeel\Rhinoceros\ 5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\view.py"
line 724, in ViewCPlane, "C:\Users\dotto\AppData\Roaming\McNeel\Rhinoceros\ 5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\view.py"

What's wrong?
Thank you very much indeed!
Silva

[Mitch]

Hi,

It would be good to know what you want. GetRectangle() will always operate in the active viewport's CPlane, so in a sense, you already have what you are trying to get... you don't need to use GetRectangle() to do this, rs.ViewCPlane() with no arguments will return the plane of the active viewport directly.

--Mitch

[Silva]

Hi Mitch,
The problem is that when you pass 3 points to PlaneFromPoints as in the example, it gives the error "unable to coerce Origin=....." This happens also with the example on the Help. So my question is: If I have the coords of 3 not aligned points how do I have to call this function to get the plane? Thanks a lot
silva

[Mitch]

Hi,

It seems to be working correctly here. The following works:

python Code:

import rhinoscriptsyntax as rs
pt1=[0,0,0]
pt2=[10,0,0]
pt3=[10,10,0]
plane=rs.PlaneFromPoints(pt1,pt2,pt3)
print plane

as well as this:

python Code:

import rhinoscriptsyntax as rs
corners = rs.GetRectangle()
if corners:
    plane=rs.PlaneFromPoints(corners[0], corners[1], corners[3])
print plane

The error message you're seeing is not coming from PlaneFromPoints, it's coming from ViewCPlane. ViewCPlane takes 2 arguments - a view and a plane. If you do not supply the view, it defaults to the current active view, but in order to comply with Python syntax if you want to pass the second argument (the plane) you need to either pass the first argument for the view, or assign the default to the second with plane=:

Python Code:

import rhinoscriptsyntax as rs
corners = rs.GetRectangle()
if corners:
    planefp=rs.PlaneFromPoints(corners[0], corners[1], corners[3])
newPlane=rs.ViewCPlane(plane=planefp)
# or : newPlane=rs.ViewCPlane(None,planefp)
# or: newPlane=rs.ViewCPlane(view=None,plane=planefp)
# or: newPlane=rs.ViewCPlane(view=rs.CurrentView(),plane=planefp)
# but not : newPlane=rs.ViewCPlane(planefp)
print planefp, newPlane

Does that make sense?

--Mitch

[Silva]

Yes! I see. Thanks a lot
Silva