[Paraview] Manipulating Big Data through Python Shell

Fri Aug 31 16:27:28 EDT 2012

I would be happy to post a video, but I wouldn't be able to make and then post it until later next week. For very small data (such as a simple sphere), the WiiMote performs with only the slightest bit of lag in comparison to the mouse. But as the data gets larger, the lag increases linearly with the size.

From: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
Sent: Friday, August 31, 2012 3:20 PM
To: Berk Geveci
Cc: Bueter, Travis J. (S&T-Student); paraview at paraview.org
Subject: Re: [Paraview] Manipulating Big Data through Python Shell

This is pretty cool!! Would it be possible to create a video of your interactions? Just to be sure, so are you saying that when you interact with mouse, the performance is much better than when you use wiimote? If performance is bad with both devices then it could be what Berk said. If one is better than another then there is something else is going on.

Thanks,

On Fri, Aug 31, 2012 at 4:08 PM, Berk Geveci <berk.geveci at kitware.com<mailto:berk.geveci at kitware.com>> wrote:
Cool stuff! The performance problem makes me think that ParaView is not using display lists. Is Immediate Mode Rendering off? (it should be). When you get to GB size data, there will have to be some LOD involved. No graphics card can render that many points at interactive rates.
On Fri, Aug 31, 2012 at 3:47 PM, Bueter, Travis J. (S&T-Student) <tjbxv7 at mail.mst.edu<mailto:tjbxv7 at mail.mst.edu>> wrote:
Hello,

I am trying to control renderings with a WiiMote instead of a mouse using Pat Marion's ParaViewSocketPlugin to send commands  to ParaView's python shell (see attached .py file) and running into an issue. When trying to manipulate 20MB of point cloud data, ParaView severely lags behind after sending commands and I was able to narrow it down to the 'Render()' call. My current fix has been to only call 'Render()' every third iteration of commands I send but this doesn't necessarily solve the issue as I plan on moving to GB sized data.

Does anyone have a suggestion as to what I can do to speed up rendering through the python shell, or another way of manipulating the render data from an external program?

Some extra information:

1.       I am running ParaView 3.14.1 64bit from source on Ubuntu 12.04

2.       Quickly rotating 15MB of point-data with the mouse peaks my CPU at about 53%. With my Wiimote application, this is just a little higher at 55% (rendering on every command).

3.       WiiMotes poll slower than most computer mice at 100Hz. So I'm pretty sure not sending commands any faster than a mouse would.

4.       Python commands are based on the python examples included with ParaView 3.14.1. They were designed to work as closely as possible to what C++ Trackball commands do. (This was my first time working with python or visualization manipulation so any advice on general improvements to the commands would be greatly appreciated too!)

5.       The Wii application works by utilizing the Nunchuk. Button combinations determine what type of manipulation (Panning, Zoom, Rotate, and Spin) and then it converts the magnitude and angle of the joystick into x-y coordinates.

I have tried to include all the information that I thought would be relevant but if there is anything else that you would like to know, I'd be more than happy to provide it.

Thanks,

Travis J. Bueter
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Missouri University of Science and Technology - Junior
B.S. Computer Engineering/Computer Science
tjbxv7 at mail.mst.edu<mailto:tjbxv7 at mail.mst.edu>
(573)-238-5843<tel:%28573%29-238-5843>

IT RSS
Treasurer - MS&T Robotics Competition Team
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| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com<http://www.kitware.com>
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