OK, thank you very much.
I didn't understood the principle of the cache, and I didn't know that I
had to execute once for all the values.Now it works.
But I find it really less easy to use than the method with series because
of this problem of cache.
If you don't see anything during the first iterations, it's maybe because
you've fixed the time parameter to a value greater than 1.
> This trick works because Streakline, unlike all other DX modules, uses
> a special cache for prior results (it actually builds the Series object
> in this cache, on the fly). This cache can get corrupted, so you
> should do a Reset Server from time to time; however, once you've got
> the whole object created and cached, Sequencer will loop nicely and
> play back the growing streakline(s), so don't Reset unless you are
> having trouble.
>
> I don't see anything for the first few iterations. Then, after that,
> the streakline starts to show up and grow longer. Not sure why, though
> it is possible that the field doesn't change much initially (it's not
> my data, I'm just the viz guy).
>
> So the presumption is that you have a set of vector fields of the same
> shape and size stored in .dx files (not sure if this works with
> .general files, though I don't see why DX should care, once they are
> Imported and turned into DX fields with vector data). They are
> logically numbered, like:
> 'data.001.dx'
> 'data.002.dx'
> etc.
>
> Then, use Sequencer to generate the number series (1,2..), and send to
> Format ('/path/data.%03d.dx', sequencer_value) to generate each
> filename. Send this to Import. Send Import's output (should be the
> vector field) to Streakline 'data' input. You don't need to do anything
> else to Streakline.
>
> You can provide a set of starting points to Streakline 'start': default
> is center of first vector field, so you only get one streakline that
> way (if the vector field doesn't do much at that position, you may not
> see the line growing). I'm using Grid with parameters (point=origin
> defined by a Vector interactor, structure="brick", shape={[20 0 0] [0
> 20 0] [0 0 5]}, density={3, 3, 3}). This gives me 27 starting points
> distributed in a 40x40x10 volume centered on origin. The output of Grid
> goes to Streakline 'start' input.
>
> That's all it takes!
>
> On Tuesday, Nov 9, 2004, at 08:46 America/New_York, Emmanuelle Lafont
> wrote:
>
>> I've tried to to send a field with 'series position' attribute, but it
>> doesn't work.
>> I didn't found any sample with this method, so I tried with a simple
>> case
>> but I can't succeed.
>> Is there samples I didn't found?
>> Does the frame number must come from the output of the sequencer?
>>
>> Moreover I don't really understand this method, because at each
>> execution
>> of the Sequencer, the Streakline module has only one step time...
>>
>> Could you help me more please?
>>
>>
>>
>>
>>
>>
>>
> _______________________________
> Chris Pelkie
> Scientific Visualization Producer
> 622 Rhodes Hall, Cornell Theory Center
> Ithaca, NY 14853
