Question: how to place the camera to make sure snapshot the whole dataset in python script (NOT in GUI)

ParaView Support
1

I am using python script to snapshot the 3D datasets. A lot of datasets. It seems the camera position/placement, etc will affect the snapshot(it may snapshot the whole dataset, or just part of it) as shown as the attached picture. The 4 pictures are actually using 2 sets of parameters to blindly snapshot the datasets (parameters are from the tracing python script for the 1st data in paraview GUI ).

I checked and found different dataset size will have different camera position/placement parameter as below lines shown to make sure snapshot the whole dataset, while I can not figure out how to calculate these parameters based on the dataset size (and maybe the window size?)

# current camera placement for renderView1

renderView1.CameraPosition = [-553.2213163882634, 1225.361636475504, 1340.9145427277479]

renderView1.CameraFocalPoint = [249.5, 249.5, 249.5]

renderView1.CameraViewUp = [0.2719455703783571, 0.8080929324180035, -0.5225240849259124]

renderView1.CameraParallelScale = 432.1466764884349

My question: how to calculate the cameral placement parameters according to the dataset size, in order to make sure snapshot the whole dataset?

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2

what about ResetCamera() ?

3

renderView1.ResetCamera() does not do the job:(
It was in my script already.

4

It should.
Can you share a simple script that shows this behavior ?

5

I realized my mistakes. I was using the tracing script and put the enderView1.ResetCamera() before the
# current camera placement for renderView1

renderView1.CameraPosition = [-553.2213163882634, 1225.361636475504, 1340.9145427277479]

renderView1.CameraFocalPoint = [249.5, 249.5, 249.5]

renderView1.CameraViewUp = [0.2719455703783571, 0.8080929324180035, -0.5225240849259124]

renderView1.CameraParallelScale = 432.1466764884349

Which make make the ResetCamera() not working.
When I add another enderView1.ResetCamera() before snap, my problem solved.

Thanks a lot. Mr. Mathieu WestPhal. It is relief as I don’t need to calculate those parameters…

1 Like
6

There is a small section on camera controls in the Sandia National Laboratory Tutorials, available from the ParaView Help menu. Look at ParaView and Python. Link is: https://www.paraview.org/Wiki/ParaView_and_Python#Control_the_camera

7

Tools … Start Trace is your friend :slight_smile: . I think you want to use the ‘resetCamera’ button, which will be recorded as a command you can use in your Python script.
HTH,

Aron