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MathGroup Archive 2007

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Re: Re: Stopping Automatic Animation in v6

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76823] Re: [mg76765] Re: Stopping Automatic Animation in v6
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Mon, 28 May 2007 00:57:05 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <f36d9n$5q2$1@smc.vnet.net> <f38s5g$icv$1@smc.vnet.net> <200705270848.EAA03172@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

On my system, NOTHING is being "animated" by your input.  It produces a
single 3D graphic.  And OF COURSE if you change something in the input
code and evaluate it, it changes the output.

Brian Gladman wrote:
> "Jean-Marc Gulliet" <jeanmarc.gulliet at gmail.com> wrote in message
> news:f38s5g$icv$1 at smc.vnet.net...
>> Brian Gladman wrote:
>>> I am trying to visualise the exact relationship between some 3D objects
>>> by
>>> using Graphics3D to display them.  But as soon as I evaluate the
>>> expression,
>>> Mathematica 6 goes into some automated animation mode which destroys the
>>> relationship I am trying to set up since I need fixed objects viewed from
>>> a
>>> specified and fixed viewpoint.
>>>
>>> But I cannot find any option in Graphics3D to turn off this automatic
>>> animation.  How do I force Graphics3D to display only what is asked for
>>> and
>>> not
>>> an animation of it?
>>>
>>> Any help with this would be much appreciated as its proving to be a real
>>> pain.
>>>
>>>    Brian Gladman
>> Brian,
>>
>> Could you, please, provide an example of an expression that behaves in
>> the incriminated way? By default, graphics (2D or 3D) are drawn static =2E
>> For example, evaluating
>>
>> Graphics3D[{Blue, Cylinder[], Red, Sphere[{0, 0, 2}], Black, Thick,
>>   Dashed, Line[{{-2, 0, 2}, {2, 0, 2}, {0, 0, 4}, {-2, 0, 2}}],
>>   Yellow, Polygon[{{-3, -3, -2}, {-3, 3, -2}, {3,
>>      3, -2}, {3, -3, -2}}], Green, Opacity[.3],
>>   Cuboid[{-2, -2, -2}, {2, 2, -1}]}]
>>
>> draws several 3D objects without any animation.
>
> Hi Jean-Marc
>
> Here is an example that shows the issue.
>
> p = {{0, 0, 3 Sqrt[6]}, {-2 Sqrt[3], -6, -Sqrt[6]}, {-2 Sqrt[3],
>    6, -Sqrt[6]}, {4 Sqrt[3], 0, -Sqrt[6]}}
> Graphics3D[{{Line[{p[[1]], p[[2]]}], Line[{p[[1]], p[[3]]}],
>    Line[{p[[1]], p[[4]]}], Line[{p[[2]], p[[3]]}],
>    Line[{p[[2]], p[[4]]}], Line[{p[[3]], p[[4]]}]}}]
>
> The very first time this is evaluated after starting up Mathematica, it is
> static but all subsequent evaluations, for example, with a change of one of
> the lines, are then immediately dynamic. That is, animation starts as soon
> as the expression is re-evaluated.  Moreover if I make a change in the 
> expression and re-evaluate it, the graphic animation continues from the last
> position it reached and not from the initial position set by the expression
> re-evaluation.
>
> What I am looking for is a switch to simply say that for this particular
> object animation should not be undertaken.
>
>> Or are you talking about the new real-time feature that allows the user
>> to rotate or expand or shrink 3D graphics with the mouse?
>
> I think it is related to this in some way. These are great new capabilities
> but it is not obvious to me how I can switch them on and off.
>
> Thanks for taking an interest in the issue.
>
>    best regards,
>
>        Brian
>
>

--
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305



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