Integrating Vector Field Vis Code

[jimmiller]

I'm not sure what you mean by "it doesn't quite work". What happens? I of course also don't know what a DisplayListAnimationControlSet is. Can you tell me the essential info on that? And then I assume you need to tell the vfr to go to time step "step" as well, right?

[what_nick]

DisplayListAnimationControlSet is a means of passing the NetCDF time to the datareader to read the appropriate timeslice. The data is loading but the DisplayLists for vfr are not getting compiled and the displaylist index set as the fresh frame - essentially moving to the same "step". I am getting the first list back.

Cheers,

whatnick.

[what_nick]

I hope this diagram will help explain the structure of the code as it stands now.

Cheers,

whatnick.

[jimmiller]

<This goofy site said I timed out while typing my initial response, and it made me log out and then log back in. Hopefully my response gets through to you this time.>

I have been looking at my original version of the code, and I am remembering how that all worked. Presumably your DisplayListAnimationControlSet instance creates an instance of AnimationSpecification and passes it to VectorFieldRenderer.startTimeSeriesAnima tion. Correct? Depending on how you are driving the animation, I am guessing that you want the AnimationMode of the AnimationSpecification to be ONE_STEP_AT_A_TIME, assuming you are controlling the progress of the animation in your code. You need to keep your own reference to the AnimationSpecification you created (say, "animSpec"), then each time you advance the animation time step in your code, you use your saved reference as: animSpec.advance( ).

Does this make sense?

[what_nick]

<To get around this goofy site's idiosyncrasies I use the keep me signed in button to get an untimed/renewed cookie>

Yes it does help. I will possibly set a flag when the animation is started and then link step to advance and set the specifier to one_step_at_a_time mode. We have basically consolidated 1 global timer for all displayed data to keep stuff in the same temporal frame of reference.

Cheers,

whatnick.

[jimmiller]

Great. Let me know if you have further problems.

[what_nick]

Hi Jim,

Next issue I am having is regarding data below the 0 level i.e. vectors in the ocean. They don't seem to get rendered. The basic code to open and display vectors using the File->Open method is now relatively stable so I am going to check in a sample file with subsea vectors and demonstrate the problem (mackenzie_depth.nc).

Cheers,

whatnick.

[jimmiller]

I originally wrote all the junk below - which may be an issue - and then I just hit on an idea that may really be the problem. Even if you turn off all the textures, etc., WorldWind is still rendering the globe. Since the vectors are below sea level, the globe itself (even though it's invisible) may be hiding them. I took my original vector field application, displayed a vector field, turned off everything I could (except the vector field), rotated the globe around, and my vector field disappeared behind the invisible globe. See if this might be the problem first. If not, then look at the other stuff I wrote.

*** OTHER STUFF
I have been back over the code and can't see anything that would discriminate against negative height values. There are some related options you may want to look at. They shouldn't affect things, but something is. For example: there is an option to ignore or use the height components of vectors in the vector field. I don't know if your below-the-ocean vectors have a non-zero height component or not. The code does assume the vectors are originally given as (deltaLat, deltaLon, deltaHeightInMeters), but of course you already know that since you have been successfully using it to this point. You might also look at the option "restrictToSubset". If that is set, but an appropriate subset is not in place, then everything could get clipped away. And I guess just make sure the (minHeight, maxHeight) is stored correctly (e.g., not (-1, -100), but rather (-100, -1)). Let me know if none of this helps, and I can look further. I'll try to make a data set whose domain is below sea level and see if I can see it.

[jimmiller]

Can you tell me where to find the "keep me logged in" button? Maybe I'm blind, but I couldn't spot it.

[jimmiller]

Did you figure out the problem? Was it the globe hiding the underwater vectors?

[what_nick]

The keep me logged in is a little check-box underneath the login dialog. I am back on board and will start working on the vectors below zero. The loader has had some fixes from UR which might make life easier.

Cheers,

whatnick.

[UweRosebrock]

Vector layer delegation

Jim,
I am actually rewriting the test code with the aim to fit into the rest of the UI.
So I am expecting better performance and more flexibility in setting up the presentation of vectors and string lines.