| Re: Displaying 3-D vector fields [message #32850 is a reply to message #32726] |
Wed, 13 November 2002 07:06   |
jim.blackwell
Messages: 11
Registered: November 2002
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Junior Member |
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"Rick Towler" <rtowler@u.washington.edu> wrote in message news:<aqrphc$26s0$1@nntp6.u.washington.edu>...
> "Jim" <jim.blackwell@gsfc.nasa.gov> wrote
>
>> Hey this is almost what I need. How would one draw more than 1 vector
>> at a time in the same window ? 3-D axes ?
>
> By following the steps I laid out in my original post.
>
> Say you want 100 vectors:
>
> ; create an object array to hold them
>
> vectors = OBJARR(100)
>
> ; create a 100 instances of my vector object
>
> for n=0, 99 do vectors[n] = OBJ_NEW('vector')
>
> ; Add our vectors to a model
>
> vecModel = OBJ_NEW('IDLgrModel')
> vecModel -> Add, vectors
>
>
> ; Now you have 100 vectors rooted at [0,0,0]
> ; with a magnitude of [0,0,1]. You probably want them
> ; to do something now...
>
> ; Use the SetProperty method to set each vectors
> ; magnitude and location. I assume you have 2
> ; arrays named "mag" and "loc" containing this
> ; data.
>
> for n=0, 99 do vectors[n] -> Setproperty, MAGNITUDE=mag[n,*], $
> LOCATION=loc[n,*]
>
> ; Now take a look at what we have.
>
> xobjview, vecModel, /block
>
>
> ; we're done for now, clean up
>
> OBJ_DESTROY, vecModel
>
>
> If you wanted to animate the vectors you would set up a loop around the call
> to the setproperty method where you would loop thru the time dimension of
> your array (if the locations were fixed you wouldn't need to change that
> property). The only problem with this is that you can't use XOBJVIEW to
> view an animation. I would suggest working on some static views making sure
> you understand what you are doing (using XOBJVIEW), then go over to David
> Fanning's website (www.dfanning.com) and take one of his object graphics
> programs and hack the vector animation stuff into it (I suggest FSC_SURFACE?
> I think that might come with axes too).
>
> -Rick
Rick,
forgive me for being such a doofus, but shouldn't the mag and loc
arrays be 3-D ? Would it be as simple as just adding this code to the
existing code set for creating the vector object ?
Thanks
Jim Blackwell
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