| Re: 3-d viz [message #31429] |
Fri, 12 July 2002 16:28  |
Paul Sorenson
Messages: 48
Registered: May 2002
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Member |
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Hello Patrick,
Are you describing a stack of 2D arrays? The stack is not very deep, so you
want to interpolate more layers in the stack? CONGRID can do this, but the
results are simple, straight "cross fades" as you progress from one known
slice to the next. A more sophisticated way to interpolate new slices is to
use morphing. There is an example of morphing in the IDL demo program
d_people.pro.
Once you have your volume, you can get a "surface of constant value" with
the XVOLUME command. For a quick example, you can do IDL> xvolume, /test.
Click on the Opaque Isosurface radio button.
-Paul Sorenson
Patrick McEnaney" <patrick@es.ucsc.edu> wrote in message
news:1eed0128.0207111543.6718dc31@posting.google.com...
> Folks-
>
> This is a continuation of the note I sent about trying to create a
> volume visualization from three structure data arrays. With the help
> of a couple of more experienced programmers I decided that what I was
> trying to do was heading in the wrong direction. This is what I think
> I need to do but I'm not sure how to go about it without getting very
> tied up with multiple loops and function calls. I have three data
> arrays representing three different CTD profiles (oceanographer types
> will know what this is), the values are monotonically ascending or
> descending with depth depending on the field. For each value in a
> profile I need to interpolate to a similar value in an adjacent
> profile so there will be a surface of constant value. That's not all
> though, to create the volume, I need to interpolate between
> depth/altitude values as well so that the profiles are horizontally
> and vertically interpolated, and then visualized three dimensionally
> similar to a geological block diagram. I don't know if this makes much
> sense but it's what the PIs want. My idea is to somehow perform
> multiple calls to INTERPOL but I'm confused as to how to do this. Any
> suggestions?
>
> Regards,
>
> Patrick
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| Re: 3-d viz [message #31568 is a reply to message #31429] |
Sun, 14 July 2002 16:17  |
patrick
Messages: 15
Registered: July 2001
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Junior Member |
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Paul-
I suspect what I need may be something like that. I'm a little
confused about it myself, hence my post. Since there are only three
data sources there isn't much of a way to get any information between
the three profiles.
For each of the profiles there are similar values at similar depths,
perhaps not the exact depth. What I need to show is a countour between
each of the profile positions. So the profile between 1-2, 2-3, and
3-1 will be similar but perhaps at slightly different depths giving
the impression of a constant value surface that may have a slope in
the water column. The same information can be portrayed just by
contouring the three profiles just using the CONTOUR command, but the
desire is to visualize it in 3-d. I've thought about trying to use
slicer3 but I don't know how to set up the arrays, my abilities aren't
that advanced.
Any suggestions?
Patrick
"Paul Sorenson" <aardvark62@msn.com> wrote in message news:<3d2f62fa_1@corp-goliath.newsgroups.com>...
> Hello Patrick,
>
> Are you describing a stack of 2D arrays? The stack is not very deep, so you
> want to interpolate more layers in the stack? CONGRID can do this, but the
> results are simple, straight "cross fades" as you progress from one known
> slice to the next. A more sophisticated way to interpolate new slices is to
> use morphing. There is an example of morphing in the IDL demo program
> d_people.pro.
>
> Once you have your volume, you can get a "surface of constant value" with
> the XVOLUME command. For a quick example, you can do IDL> xvolume, /test.
> Click on the Opaque Isosurface radio button.
>
> -Paul Sorenson
>
> Patrick McEnaney" <patrick@es.ucsc.edu> wrote in message
> news:1eed0128.0207111543.6718dc31@posting.google.com...
>> Folks-
>>
>> This is a continuation of the note I sent about trying to create a
>> volume visualization from three structure data arrays. With the help
>> of a couple of more experienced programmers I decided that what I was
>> trying to do was heading in the wrong direction. This is what I think
>> I need to do but I'm not sure how to go about it without getting very
>> tied up with multiple loops and function calls. I have three data
>> arrays representing three different CTD profiles (oceanographer types
>> will know what this is), the values are monotonically ascending or
>> descending with depth depending on the field. For each value in a
>> profile I need to interpolate to a similar value in an adjacent
>> profile so there will be a surface of constant value. That's not all
>> though, to create the volume, I need to interpolate between
>> depth/altitude values as well so that the profiles are horizontally
>> and vertically interpolated, and then visualized three dimensionally
>> similar to a geological block diagram. I don't know if this makes much
>> sense but it's what the PIs want. My idea is to somehow perform
>> multiple calls to INTERPOL but I'm confused as to how to do this. Any
>> suggestions?
>>
>> Regards,
>>
>> Patrick
>
>
>
>
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> http://www.newsfeed.com The #1 Newsgroup Service in the World!
> -----= Over 100,000 Newsgroups - Unlimited Fast Downloads - 19 Servers =-----
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