Comparing Two Points (Equality)

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Permalink Reply by Marios Tsiliakos on August 19, 2015 at 11:19am

Trying to troubleshoot without the file is kind of tricky.

The attached works. Have a look and compare it to your file.

ta,

M.

Attachments:

• 150819_compare-point_py_MT.gh, 8 KB

Permalink Reply by Tracy Huynh on August 19, 2015 at 2:16pm

Hello Marios,

Thank you for your advice and sharing the file! I have discovered my error. I was comparing two points created with python script (First creating a polyline from a set of points via "rs.AddPolyline()" and then finding the Centroid of the polyline curve via "rs.CurveAreaCentroid()"). 

I noticed that if the same polyline was drawn in a different points order, that the centroid points wouldn't be equal. I solved that issue by sorting the points each time before a polyline was drawn. I also noticed that rs.CurveAreaCentroid returns two outputs, a Point3d fat Index[0] and an error bound at Index[1]. The comparison that would return identical points as equal is by only comparing the Point3d output of rs.CurveAreaCentroid. 

Thought I would share that in case someone else runs into the same issue! I've included snippets of my code.

# -- Sorting points to draw polyline curves

Points1 = [p0,p1,p2]
Points2 = rs.SortPoints(Points1,True,0)
Points2.append(Points2[0])
Faces.append(rs.AddPolyline(Points2))

# -- Deleting the same polyline curves

objs = rs.AllObjects()

Curves = []
Centroid = []

for i in objs:
Type = rs.ObjectType(i)
if Type == 4:
if rs.IsCurveClosed(i):
C = rs.CurveAreaCentroid(i)
if C[0] not in Centroid:
Curves.append(i)
Centroid.append(C[0])
else:
rs.DeleteObject(i)

Cheers,

TH