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Re: [Visualpython-users] points demo
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From: Bruce S. <Bru...@nc...> - 2008-12-21 20:53:39
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> It's interesting and pretty, and it's good to see the value of the points object for representing a large amount of 3D data.<br> <br> However, be aware that the star positions aren't real, just generated from random numbers (and there's an odd effect in the random number generator, because a strong concentration in the form of a straight bar shows up at certain angles of view). <br> <br> I don't see any wobble on my computer.<br> <br> A quick search indicates that astronomers aren't sure whether we should expect to find black holes at the center of globular clusters or not. There is now some evidence for a black hole in one or more specific globular clusters, though I didn't see M80 mentioned.<br> <br> Bruce Sherwood<br> <br> symion wrote: <blockquote cite="mid:494...@pr..." type="cite">The following program, <a moz-do-not-send="true" href="http://home.primusonline.com.au/knoware/python/stars-5.py">stars-5.py</a> is a simulation of Globular cluster Messier 80, using the new points object. It produces a huge volume of space with almost 6000 points. (you have to zoom in and in... to find the black hole at the centre)<br> <br> Pressing the Enter Key will select a specific 'star' that you can zoom toward to see it as a glowing disk.<br> <br> The position of each star is determined by the individual position of each point in the points(pos array), and I have found a strange effect. The stars near the outer edge of the cluster have a distinct wobble when spinning around them, apparently the position of each point becomes more unstable as you zoom in toward its limit and so the star wobbles!<br> <br> Apart from that the simulation looks close to <a moz-do-not-send="true" href="http://en.wikipedia.org/wiki/Globular_cluster">Messier 80</a><br> <br> Symion<br> <br> <pre wrap=""> <hr size="4" width="90%"> ------------------------------------------------------------------------------ </pre> <pre wrap=""> <hr size="4" width="90%"> _______________________________________________ Visualpython-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:Vis...@li...">Vis...@li...</a> <a class="moz-txt-link-freetext" href="https://lists.sourceforge.net/lists/listinfo/visualpython-users">https://lists.sourceforge.net/lists/listinfo/visualpython-users</a> </pre> </blockquote> </body> </html> |
