[Paraview] How to re-render or update the window through python script

[Burlen Loring]

you're leaking a dataset with each iteration. You need to

Delete(reader)
del reader

each iteration.


--- original.py 2013-11-08 11:52:45.746871024 -0800
+++ fixleak.py  2013-11-08 11:56:32.226876191 -0800
@@ -15,15 +15,13 @@

  while true == 1:
      OutPutFile = OutPutLocation+'local_'+str(count).zfill(4)+'.vtk'
-
-    while exist == 0:
-        try:
-            with open(OutPutFile):
-                exist = 1
-        except IOError:
-            exist = 0
-    exist = 0
-
+    if os.path.exists(OutPutFile)
+        raise RuntimeError('File %s deosnt exist'%(OutPutFile))
+
+    if reader:
+        Delete(reader)
+        del reader
+
      reader = OpenDataFile(OutPutFile)

      reader.PointData
@@ -47,13 +45,5 @@
          cam.Elevation(30)
          cam.Azimuth(30)
          Render()
-
+
      count = count + 1
-# Stop the script killing itself
-    nOutPutFile = OutPutLocation+'local_'+str(count).zfill(4)+'.vtk'
-    while exist == 0:
-        try:
-            with open(nOutPutFile):
-                exist = 1
-        except IOError:
-            exist = 0


On 11/08/2013 10:34 AM, Junyi Han wrote:
> Hi,
>
> Thanks for your reply. Below is my script:
>
>
> '''
> Created on 29 Oct 2013
>
> @author: Junyi Han
> '''
> from paraview.simple import *
>
> PVServer = 'localhost'
> OutPutLocation = '/home/johnny/Application/DPD/myDPD-PVersion/'
> exist = 0
> count = 0
> true = 1
>
> Connect(PVServer)
>
> while true == 1:
>     OutPutFile = OutPutLocation+'local_'+str(count).zfill(4)+'.vtk'
>     while exist == 0:
>         try:
>             with open(OutPutFile):
>                 exist = 1
>         except IOError:
>             exist = 0
>     exist = 0
>     reader = OpenDataFile(OutPutFile)
>
>     reader.PointData
>     view = GetRenderView()
>
>     dp = GetDisplayProperties()
>     dp.Representation = 'Surface'
>
>     readerRep = GetRepresentation()
>     readerRep.ColorArrayName = 'density_01'
>
> # Force read
>     reader.UpdatePipeline()
>
>     Show(reader)
>     Render()
>
> # Get a nice view angle
>     if count == 0:
>         cam = GetActiveCamera()
>         cam.Elevation(30)
>         cam.Azimuth(30)
>         Render()
>     count = count + 1
> # Stop the script killing itself
>     nOutPutFile = OutPutLocation+'local_'+str(count).zfill(4)+'.vtk'
>     while exist == 0:
>         try:
>             with open(nOutPutFile):
>                 exist = 1
>         except IOError:
>             exist = 0
>
>
>
> 2013/11/8 Burlen Loring <bloring at lbl.gov <mailto:bloring at lbl.gov>>
>
>     it sounds like what happens when one leaks datasets, filters, or
>     other vtk objects that hold large amounts of data. Could you share
>     your script?
>
>
>     On 11/08/2013 09:55 AM, Junyi Han wrote:
>>     Hi,
>>
>>     I'm using python script to read data files. Render() function is
>>     called as many times as the number of files. I found that after I
>>     call render() for 40 or 50 times, the speed of rendering is very
>>     slow. Is there a way to solve it? Instead of calling Render()
>>     function several times, is there a way to update or re-render?
>>
>>     Best wishes,
>>     Junyi Han
>>
>>
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