Python/vtk - set each point size individually in a vtkPolyData object? -

i using following code populate point cloud: how display point cloud in vtk in different colors?

the points long, lat , depth of quakes in new zealand right now.

i want change point size, scale fourth value - mag - magnitude data each quake in swarm.

i'm not familiar vtk wrapper, , wondered if point out @ point can address actor, , change each point size:

code:

import vtk import csv import numpy   class points_maker(object):     def __init__(self, fname):         self.fname = fname         self.points = []         self.points_mag = []         self.get_data()      def get_data(self):         reader = csv.reader(open(self.fname, "rb"))         row in reader:             if "fid" in row[0]:                 pass             else:                 longitude = (float(row[3]) - 174) * 10 #de-localises value                 latitude = (float(row[4]) + 41) * 10 #de-localises value                 depth = float(row[5])                 magnitude = float(row[6])                 point = [longitude, latitude, depth]                 point_and_mag = [[longitude, latitude, depth], magnitude]                 point = numpy.asarray(point)                 point_and_mag = numpy.asarray(point_and_mag)                 self.points.append(point)                 self.points_mag.append(point_and_mag)  class vtkpointcloud:      def __init__(self, zmin=-0.0, zmax=100.0, maxnumpoints=1e6): #sets colou limits         self.maxnumpoints = maxnumpoints         self.vtkpolydata = vtk.vtkpolydata()         self.clearpoints()         mapper = vtk.vtkpolydatamapper()         mapper.setinput(self.vtkpolydata)         mapper.setcolormodetodefault()         mapper.setscalarrange(zmin, zmax)         mapper.setscalarvisibility(1)         self.vtkactor = vtk.vtkactor()         self.vtkactor.setmapper(mapper)      def addpoint(self, point):         mag = 10         if self.vtkpoints.getnumberofpoints() < self.maxnumpoints:             pointid = self.vtkpoints.insertnextpoint(point[:])             self.vtkdepth.insertnextvalue(point[2])             self.vtkcells.insertnextcell(1)             self.vtkcells.insertcellpoint(pointid)         self.vtkcells.modified()         self.vtkpoints.modified()         self.vtkdepth.modified()       def clearpoints(self):         self.vtkpoints = vtk.vtkpoints()         self.vtkcells = vtk.vtkcellarray()         self.vtkdepth = vtk.vtkdoublearray()         self.vtkdepth.setname('deptharray')         self.vtkpolydata.setpoints(self.vtkpoints)         self.vtkpolydata.setverts(self.vtkcells)         self.vtkpolydata.getpointdata().setscalars(self.vtkdepth)         self.vtkpolydata.getpointdata().setactivescalars('deptharray')   def main():     pm = points_maker("quake.csv")     pointcloud = vtkpointcloud()     point_and_mag in pm.points_mag:         mag = point_and_mag[1]         point = point_and_mag[0]         pointcloud.addpoint(point)     renderer = vtk.vtkrenderer()     renderer.addactor(pointcloud.vtkactor)     renderer.setbackground(.2, .3, .3)  #colour     renderer.resetcamera()      # render window     renderwindow = vtk.vtkrenderwindow()     renderwindow.addrenderer(renderer)      # interactor     renderwindowinteractor = vtk.vtkrenderwindowinteractor()     renderwindowinteractor.setrenderwindow(renderwindow)      # begin interaction     renderwindow.render()     renderwindowinteractor.start()  if __name__ == '__main__':     main() 

snippet of points_and_mag data:

[[4.45699999999988, -5.540999999999983, 10.0391] 2.38] [[3.9390000000000214, -5.606999999999971, 17.7148] 3.7352] [[4.182999999999879, -5.519999999999996, 11.0938] 2.16] [[3.9979999999999905, -5.390999999999977, 8.5713] 2.4826] [[3.9560000000000173, -5.568000000000026, 12.1685] 3.5205] [[4.41900000000004, -5.381, 15.1953] 2.1109] [[4.507000000000119, -5.360999999999976, 14.3164] 2.5587] [[3.973000000000013, -5.688999999999993, 14.1406] 2.7651] [[4.139999999999873, -5.290000000000035, 10.9766] 2.6873] [[7.182999999999993, -3.92000000000003, 11.6797] 2.5306] [[4.07999999999987, -5.489999999999995, 17.4805] 5.7216] [[4.113000000000113, -5.416000000000025, 15.0195] 2.8919] [[3.7520000000000664, -6.462999999999965, 5.8203] 2.0667] [[7.727999999999895, -6.178999999999988, 29.0234] 2.0115] 

using this: http://www.vtk.org/wiki/vtk/examples/python/geometricobjects/display/point

i have figure out how change whole set size, makes me suspect point cloud 1 actor, not each instance of point in pointcloud:-

def addpoint(self, point, mag):     if self.vtkpoints.getnumberofpoints() < self.maxnumpoints:         pointid = self.vtkpoints.insertnextpoint(point[:])         self.vtkdepth.insertnextvalue(point[2])         self.vtkcells.insertnextcell(1)         self.vtkcells.insertcellpoint(pointid)         self.vtkactor.getproperty().setpointsize(mag*10)     self.vtkcells.modified()     self.vtkpoints.modified()     self.vtkdepth.modified()     self.vtkactor.modified() 

ah, figured out.

i needed have constructor pointcloud = vtkpointcloud() inside loop steps through points, , renderer.addactor(pointcloud.vtkactor) inside loop step.