Re: [Visualpython-users] points demo

[Bruce S. <Bru...@nc...>]

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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>
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