[IDV #SJK-116567]: Error when generating volume rendering

Norhakim,

I see the visualization artifacts you refer to under *some* but not all
angles. I think it has something to do with the sparseness of your data (both
the amount of data and the limited data value range). I have searched the
archive to see if this has come up before, but I have not found anything.  You
may wish to experiment with the settings (including 3D settings) under the View
-> Properties menu items or other various rendering settings. My own
experimentation did not reveal any improvements though I may have missed
something.

Best,

Unidata IDV Support

> Hello,
> 
> I have uploaded the data as requested. So far, I have tried Isosurface and 
> Vertical Profile visual tools, and I found the Volume rendering is much 
> suitable with my interest.
> 
> Thank you
> 
> Warm regards,
> Norhakim
> ________________________________________
> From: Unidata IDV Support <address@hidden>
> Sent: Tuesday, April 28, 2015 9:06 PM
> To: Yusof, N. (ITC)
> Cc: address@hidden
> Subject: [IDV #SJK-116567]: Error when generating volume rendering
> 
> Norhakim,
> 
> Please upload your corrected data to
> 
> http://motherlode.ucar.edu/repository/alias/idvupload
> 
> And let us know when it is there.
> 
> Have you experimented with other display types that may be
> adequate or better for the data you wish to display?
> 
> Best,
> 
> Unidata IDV Support
> 
> > Hello Sir/Madam,
> >
> > After I followed your advice, finally I can visualize my wind netcdf data 
> > using volume rendering tool in IDV. However, when I change the rotation of 
> > the cube, the wind volume seems to fade and I can see only layers 
> > (Figure2). Please find attached the wind volume rendering. Figure1 seem OK, 
> > somehow in Figure2 the volume is fading even I have tried to set different 
> > percentage of transparency. Is this something to do with the lighting 
> > intensity of positioning? Or because I’m using small number of layers (6 
> > layers) to produce the volume rendering?
> >
> > Thank you in adavance.
> >
> > Warm regards,
> > Norhakim
> > ________________________________________
> > From: Unidata IDV Support <address@hidden>
> > Sent: Monday, April 27, 2015 9:45 PM
> > To: Yusof, N. (ITC)
> > Cc: address@hidden
> > Subject: [IDV #SJK-116567]: Error when generating volume rendering
> >
> > Norhakim,
> >
> > I have spent some time looking at your file, and from what I can tell it has
> > quite a few problems.
> >
> > For starters, you'll need a missing_value attribute (see attached NCML).
> >
> > Second, there are only non-missing data at 1012, 1009 hPa levels. Is this 
> > really
> > correct?
> >
> > Third, the file claims to use CF 1.6. Make sure you are using the CF 
> > convention
> > correctly with respect to time. No times are defined in your file. (I am not
> > exactly sure what the CF conventions says here, but it looks suspicious.)
> >
> > Fourth, you have a data level at 98 hPa. Is this really correct?
> >
> > Take some time looking at your data, and before doing a "Volume Rendering",
> > please try some simpler plots to see if your data are as you expect. I find 
> > that
> > IDV "Value Plots" are really handy in situations where I am debugging the 
> > data.
> >
> > Keep us up-to-date on your progress.
> >
> > Best,
> >
> > Unidata IDV Support
> >
> > > Full Name: Norhakim Yusof
> > > Email Address: address@hidden
> > > Organization: University of Twente
> > > Package Version: 5.1u2 build date:2015-04-12 07:07 UTC
> > > Operating System: Windows 7
> > > Hardware: Java: home: C:\Program Files\IDV_5.1u2\jre version: 1.7.0_51 
> > > j3d:1.6.0-pre9-daily-experimental daily
> > > Description of problem:
> > >
> > > I'm got an error when I want to visualize my generated netcdf data
> > > using the volume rendering tool. My netcdf file contain three dimensions
> > > comprise of level(pressure level), latitude and longitude. In addition,
> > > I have two variables namely, u and v  which I want to derive wind speed
> > > using these  variables. In order to generate the volume of wind speed,
> > > I have selected Speed(from u&v) from Derived (under 3D grid in Fields)
> > > and then, select Volume Rendering (under Displays). In Level tab, I
> > > have selected all pressure levels. The error pop up when I click Create
> > > Displey and telling :
> > >
> > > Creating display: Volume Rendering
> > > java.lang.ClassCastException: java.lang.ClassCastException: visad.Real 
> > > cannot be cast to visad.FlatField
> > > visad.Real cannot be cast to visad.FlatField
> > >
> > > So, far I don't have any clue what goes wrong with my data. I believe
> > > this, msg is derived from java code (which I'm not fimiliar with java). I
> > > really appreciate if you can provide me some guides or discribe that cause
> > > this problem (from the data) so I could fully utilized this software to
> > > visualize my data. Please find attached the data that I used.
> > >
> > > Thank you
> > >
> > > Kind regards
> > > Norhakim Yusof
> > > PhD student
> > > University of Twente
> > >
> > >
> > > ******************
> > > Stack trace:
> > > java.lang.ClassCastException: visad.Real cannot be cast to visad.FlatField
> > > at 
> > > ucar.unidata.data.grid.DerivedGridFactory.createVectorMagnitude(DerivedGridFactory.java:1553)
> > > at 
> > > ucar.unidata.data.grid.DerivedGridFactory.createWindSpeed(DerivedGridFactory.java:1477)
> > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> > > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> > > at java.lang.reflect.Method.invoke(Unknown Source)
> > > at 
> > > org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186)
> > > at 
> > > org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204)
> > > at org.python.core.PyObject.__call__(PyObject.java:404)
> > > at org.python.core.PyObject.__call__(PyObject.java:408)
> > > at org.python.pycode._pyx68.f$0(<string>:1)
> > > at org.python.pycode._pyx68.call_function(<string>)
> > > at org.python.core.PyTableCode.call(PyTableCode.java:165)
> > > at org.python.core.PyCode.call(PyCode.java:18)
> > > at org.python.core.Py.runCode(Py.java:1261)
> > > at org.python.core.__builtin__.eval(__builtin__.java:484)
> > > at org.python.core.__builtin__.eval(__builtin__.java:488)
> > > at org.python.util.PythonInterpreter.eval(PythonInterpreter.java:190)
> > > at ucar.unidata.data.DerivedDataChoice.getData(DerivedDataChoice.java:795)
> > > at ucar.unidata.data.DataChoice.getData(DataChoice.java:637)
> > > at ucar.unidata.data.DataInstance.getData(DataInstance.java:243)
> > > at ucar.unidata.data.DataInstance.getData(DataInstance.java:207)
> > > at ucar.unidata.data.grid.GridDataInstance.init(GridDataInstance.java:206)
> > > at 
> > > ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:163)
> > > at 
> > > ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:144)
> > > at 
> > > ucar.unidata.idv.control.GridDisplayControl.doMakeDataInstance(GridDisplayControl.java:299)
> > > at 
> > > ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:3278)
> > > at 
> > > ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:3234)
> > > at 
> > > ucar.unidata.idv.control.VolumeRenderControl.setData(VolumeRenderControl.java:205)
> > > at 
> > > ucar.unidata.idv.control.VolumeRenderControl.init(VolumeRenderControl.java:124)
> > > at 
> > > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1402)
> > > at 
> > > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1085)
> > > at 
> > > ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:986)
> > > at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:911)
> > > at ucar.unidata.util.Misc$3.run(Misc.java:1243)
> > >
> > >
> > >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: SJK-116567
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: SJK-116567
> Department: Support IDV
> Priority: Normal
> Status: Closed
> 
> 
> 


Ticket Details
===================
Ticket ID: SJK-116567
Department: Support IDV
Priority: Normal
Status: Closed