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ArcGIS PRO: ArcPy: Creating a 3D polyline, visible in Map_3D?

MatthiasBuehler

Hi,

I am using this code to create a polylineZM in PRO, but I cannot see it in Map_3D (3d viewport).

I do have x,y,z coordinates..

Could somebody help me with this?

Any input welcome!

Matt

def write_polyLine(data,outfile):
array = arcpy.Array()
point = arcpy.Point()
features=[]
for feature in data:
for part in feature:
point.X=part[0]
point.Y=part[1]
point.Z=part[2]
array.add(point)
MP=arcpy.Polyline(array,None,True,True)
array.removeAll()
features.append(MP)
arcpy.CopyFeatures_management(features, outfile, "", "0", "0", "0")

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MatthiasBuehler

hi .. basically yes. this was just a quick test method .. I will probably adapt it again.

in your experience, writing n lines individually to an FC compared to sending a list full and write once .. is there a big performance difference?

XanderBakker

You are very welcome, although I can't remember doing anything...

What I am curious about is the data format of the linePointList. You use it as a list of lists (each element in linePointList is a list that consists of a list with at least X, Y, and Z elements). Is this always a straight line (so two points)?. And do you always want to write each line to a different featureclass?

MatthiasBuehler

Hi ..

thanks, this did help.

I came up with this method that works now:

def write_one_line_feature(linePointList, fc, spatialRef):

pnt1 = arcpy.Point(linePointList[0][0], linePointList[0][1], linePointList[0][2])

pnt2 = arcpy.Point(linePointList[1][0], linePointList[1][1], linePointList[1][2])

line = arcpy.Polyline(arcpy.Array([pnt1, pnt2]), spatialRef, True, False)

arcpy.CopyFeatures_management(line, fc)

[[

I'm not perfectly sure what it was, but I think I made 2 errors:

1] I think the FC I created was polygon, not polyline

2] in arcpy.Polyline(), I did not define the spatial reference

either or .. not sure.

]]

huge thanks, also to Xander Bakker

DanPatterson_Retired

Xander Bakker has a series of blog posts on creating 3D features which you may be interested. There are code examples, see Creating a 3D tree with Arcpy for 3D Analysis the bottom example and refer to his other posts for more code samples and examples

MatthiasBuehler

ps.

this is how I create the target polygon FC first:

arcpy.CreateFeatureclass_management(ws, 'diag', 'POLYGON', has_z = 'ENABLED', spatial_reference = spatialRef)

I noticed the spatial reference sometimes gets created correctly, sometimes not. pretty erratic though.

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