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Re: [Visualpython-users] basic questions
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From: Tim S. (25121) <tk...@mi...> - 2009-11-14 04:40:28
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I pulled out one dataset we may use of 208,352 spheres ( I will try points soon). The initial scene renders quickly but zooming and panning of the image is very slow. When I say it's wild, it seems like my scene is rotating on a huge axis, where I want my scene to flip and spin while staying in the centre of the screen. Right now when I right click and drag down my model flys off the display and does a big circle till it comes back around on the screen. Could this be todo with the data set I'm rendering ?? -----Original Message----- From: Bruce Sherwood [mailto:Bru...@nc...] Sent: Saturday, 14 November 2009 12:29 PM To: vis...@li... Subject: Re: [Visualpython-users] basic questions VPython implements a second "rendering" thread which about 25 times per second interrupts your computations to create a 3D image (using OpenGL) from the current attributes of the objects, and the current (mouse-determined) "camera" viewing angle. A complete rendering is done each time (25 per second) even if no object has changed nor the camera has moved. For this reason performance with very large numbers of objects is likely to be poor, but it's easy enough to test simply by creating a very large number of objects. You could make the window invisible while computing, so as not to be interrupted by rendering, but once you make the window visible you may see poor performance for zooming and rotating. The cheapest object to render is "points" which makes 2D disks or squares positioned at 3D locations. It is moreover an array object, with a list for the positions of the points. Please say more about your question regarding zoom and rotate. What is "wild" about using the mouse to rotate or zoom the camera for looking at the scene? There is documentation on mouse manipulations in the Visual help available on the Help menu in IDLE. Under Windows, Events, & Files see Mouse Events. Also, in the contributed section of vpython.org are some example programs that do fancy things with the mouse. And see the Tutorial on the first page of the help for the basics on using the mouse to zoom and rotate. Bruce Sherwood Tim Smith (25121) wrote: > 1. Can vpython handle large datasets? I'm considering using it for > a project modelling a large geographical body, I might need to plot > 1,000,000 points or more. > > 2. What would be the best object to use ? > > 3. Is there a tutorial on mouse manipulation so I can zoom in and > out and rotate my object? The default behaviour seems a bit wild ------------------------------------------------------------------------ ------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Visualpython-users mailing list Vis...@li... https://lists.sourceforge.net/lists/listinfo/visualpython-users ********************************************************************** IMPORTANT - This email and any attachments may contain confidential or privileged information intended solely for the intended recipient and / or copyrighted material. If you are not the intended recipient you must not use, interfere with, disclose, copy or take any action with reliance on this email or any part of it. If you have received this email in error please advise the sender via return email and delete or destroy all copies of this email and attachments. Any claim to confidentiality or privilege is not waived or lost by reason of mistaken transmission of this message. Any unauthorised use, copying or distribution is prohibited. Minara Resources Limited does not warrant that this email or any attachments are free of viruses and cannot guarantee the accuracy, reliability or completeness of this email and any attachments. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.clearswift.com ********************************************************************** |
