[vtkusers] VTK class to do interpolation of scalar values

Jesse Kim jinryongkim at gmail.com
Mon Dec 7 16:16:23 EST 2009 

Bill,

What I'm saying is to show iso contour with different height (like warp) 
so that higher contour lines have higher height.
Is it possible?

Thanks,

Jesse

Bill Lorensen wrote:
> Your data points seem to all have a z=0.0. If they are scattered in 3D
> space, then Delaunay3D might do the trick.
>
> Bill
>
>
> On Mon, Dec 7, 2009 at 3:49 PM, Jesse Kim <jinryongkim at gmail.com> wrote:
>   
>> Bill,
>>
>> Thanks so much for your help.
>>
>> I think this what I wanted to get. However, I have one more question for
>> you. Is there any way I can express them in 3D like isosurface? Should I
>> change it to delaunay3D?
>>
>> Thanks,
>>
>> Jesse
>>
>> Bill Lorensen wrote:
>>     
>>> Jesse,
>>>
>>> I loaded your data into paraview (paraview.org), applied the
>>> Delaunay2D filter->ContourFilter and produced the attached image. Is
>>> this what you would expect?
>>>
>>> Bill
>>>
>>>
>>> On Mon, Dec 7, 2009 at 1:55 PM, Jesse Kim <jinryongkim at gmail.com> wrote:
>>>
>>>       
>>>> Hi Bill and David,
>>>>
>>>> Thanks for the reply.
>>>> For the clarification, let me provide my sample data set. What I would
>>>> like
>>>> to do here is to do the interpolations among these scalar values
>>>> associated
>>>> with some geographical locations (75 locations) so that I can have smooth
>>>> iso-contour or iso-surface. This the dataset of some geographical
>>>> locations
>>>> (75 locations) and their scalar values.
>>>>
>>>> # vtk DataFile Version 2.0
>>>> Weather observing stations
>>>> ASCII
>>>> DATASET POLYDATA
>>>> POINTS 75 float
>>>> 660.905194 527.736720 0.0
>>>> 536.263098 683.230547 0.0
>>>> 702.452710 1112.016367 0.0
>>>> 710.006701 838.724374 0.0
>>>> 354.965505 414.650300 0.0
>>>> 660.905194 862.283951 0.0
>>>> 694.898493 485.329312 0.0
>>>> 657.128312 612.551535 0.0
>>>> 589.141714 975.370370 0.0
>>>> 490.938700 424.074074 0.0
>>>> 260.539826 640.823140 0.0
>>>> 317.195324 805.740741 0.0
>>>> 260.539826 376.954638 0.0
>>>> 366.296604 164.917601 0.0
>>>> 113.235531 75.391041 0.0
>>>> 128.343513 98.950617 0.0
>>>> 664.682303 720.925926 0.0
>>>> 653.351203 932.962963 0.0
>>>> 358.742613 735.061728 0.0
>>>> 173.667911 329.835485 0.0
>>>> 158.559929 1107.3046210 0.0
>>>> 498.492917 1088.4567900 0.0
>>>> 294.533125 546.584268 0.0
>>>> 524.931999 588.991675 0.0
>>>> 589.141714 466.481481 0.0
>>>> 524.931999 245.020670 0.0
>>>> 181.222129 1088.4567900 0.0
>>>> 256.762717 160.205856 0.0
>>>> 585.364606 890.555556 0.0
>>>> 407.844121 574.855873 0.0
>>>> 528.709108 164.917601 0.0
>>>> 430.506320 782.181164 0.0
>>>> 385.181921 862.283951 0.0
>>>> 608.026805 292.139823 0.0
>>>> 547.594198 815.164515 0.0
>>>> 370.073713 480.617284 0.0
>>>> 298.310007 862.283951 0.0
>>>> 41.471825 65.966984 0.0
>>>> 604.249696 711.502152 0.0
>>>> 162.336811 65.966984 0.0
>>>> 460.722510 669.094744 0.0
>>>> 562.702406 367.530864 0.0
>>>> 347.411514 334.547231 0.0
>>>> 362.519722 240.308642 0.0
>>>> 132.120621 669.094744 0.0
>>>> 177.445020 226.172840 0.0
>>>> 396.513021 1027.2015520 0.0
>>>> 67.911133 131.934251 0.0
>>>> 113.235531 183.765432 0.0
>>>> 211.438319 914.115132 0.0
>>>> 725.114910 617.263280 0.0
>>>> 422.952102 951.810794 0.0
>>>> 192.553228 584.279930 0.0
>>>> 596.695705 537.160494 0.0
>>>> 728.891792 758.621305 0.0
>>>> 453.168519 259.156473 0.0
>>>> 521.155117 278.004021 0.0
>>>> 475.830718 362.818836 0.0
>>>> 517.378008 518.312663 0.0
>>>> 290.756016 273.292275 0.0
>>>> 396.513021 1130.864198 0.0
>>>> 298.310007 70.679012 0.0
>>>> 154.782821 499.465115 0.0
>>>> 237.877627 1079.033016 0.0
>>>> 679.790511 296.851852 0.0
>>>> 135.897730 292.139823 0.0
>>>> 513.600899 871.707725 0.0
>>>> 502.269800 998.929947 0.0
>>>> 215.215427 259.156473 0.0
>>>> 260.539826 768.045362 0.0
>>>> 245.431617 786.892910 0.0
>>>> 218.992309 989.506173 0.0
>>>> 392.735912 650.246914 0.0
>>>> 324.749315 310.987654 0.0
>>>> 339.857523 942.386737 0.0
>>>> POINT_DATA 75
>>>> SCALARS req_prep_0 float
>>>> LOOKUP_TABLE default
>>>> 184.949631
>>>> 125.071189
>>>> 114.655333
>>>> 142.508891
>>>> 250.255094
>>>> 132.980147
>>>> 132.369983
>>>> 104.52796
>>>> 331.737495
>>>> 336.049583
>>>> 214.249765
>>>> 117.033152
>>>> 329.449907
>>>> 266.396892
>>>> 147.324093
>>>> 293.163118
>>>> 104.33426
>>>> 313.719804
>>>> 207.564979
>>>> 109.947172
>>>> 143.08005
>>>> 143.859373
>>>> 189.977409
>>>> 126.483623
>>>> 217.989847
>>>> 372.728658
>>>> 343.744282
>>>> 94.816421
>>>> 187.774541
>>>> 186.499795
>>>> 337.102472
>>>> 182.862572
>>>> 125.000005
>>>> 520.225266
>>>> 267.150263
>>>> 104.699336
>>>> 187.176938
>>>> 111.811702
>>>> 314.11783
>>>> 463.261076
>>>> 131.671659
>>>> 361.803069
>>>> 272.000024
>>>> 178.927209
>>>> 274.940403
>>>> 176.914528
>>>> 249.996726
>>>> 225.34729
>>>> 220.164636
>>>> 192.443055
>>>> 274.59666
>>>> 242.720081
>>>> 163.316313
>>>> 214.000012
>>>> 150.596283
>>>> 274.416211
>>>> 532.135911
>>>> 453.662097
>>>> 229.363398
>>>> 733.273974
>>>> 151.398179
>>>> 162.908337
>>>> 244.352757
>>>> 332.847796
>>>> 480.445379
>>>> 541.82268
>>>> 384.111595
>>>> 201.312356
>>>> 234.118599
>>>> 185.278497
>>>> 159.692496
>>>> 281.602642
>>>> 356.659038
>>>> 377.949511
>>>> 469.000015
>>>>
>>>> Bill Lorensen wrote:
>>>>
>>>>         
>>>>> The data for the example should be some points scattered in space. I
>>>>> assume that is what Jin has, not just three points on a line. I'll dig
>>>>> up some meaningful data, uless Jin can share a small sample of his
>>>>> data.
>>>>>
>>>>> Bill
>>>>>
>>>>> Bill
>>>>>
>>>>> On Mon, Dec 7, 2009 at 1:11 PM, David Doria <daviddoria+vtk at gmail.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>>           
>>>>>> On Mon, Dec 7, 2009 at 12:20 PM, David Gobbi <david.gobbi at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>
>>>>>>             
>>>>>>> On Mon, Dec 7, 2009 at 9:51 AM, David Doria <daviddoria+vtk at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>>>> On Mon, Dec 7, 2009 at 11:43 AM, Jin Ryong Kim
>>>>>>>> <jinryongkim at gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> I have a question about interpolation method in VTK.
>>>>>>>>> Currently, I'm trying to interpolate scalar values between data
>>>>>>>>> points
>>>>>>>>> to
>>>>>>>>> create a contour map.
>>>>>>>>> I have some data points set (x, y, z) and scalar values related with
>>>>>>>>> each
>>>>>>>>> data point.
>>>>>>>>> So far, I found out vtkProbeFilter but when I tried, nothing came
>>>>>>>>> up.
>>>>>>>>> My questions are as follow.
>>>>>>>>> 1. Is vtkProbeFilter the right choice in this case?
>>>>>>>>> 2. If not, what are the right vtk classes to accomplish such a goal?
>>>>>>>>> If anyone has the solution for this, please let me know.
>>>>>>>>> Thanks in advance!
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> Jin,
>>>>>>>>
>>>>>>>> If I'm not mistaken you sent this same question yesterday. I am
>>>>>>>> interesting in making an example of this so I have started poking
>>>>>>>> around. I understand that you may be in a hurry, but asking twice is
>>>>>>>> just going to annoy people on the list, making your answer come
>>>>>>>> slower, not faster.
>>>>>>>>
>>>>>>>> Can anyone confirm or deny that ProbeFilter is the right way to go?
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>> The probe needs cells to interpolate the data.  If all you have is
>>>>>>> points, then you have to apply delaunay first to make the cells, and
>>>>>>> then use probe to interpolate the data onto a grid (i.e. make an
>>>>>>> image), and then contour the grid.  It might also be possible to
>>>>>>> contour directly from the output of delaunay, but I'm not sure whether
>>>>>>> VTK can do that.  I'm no expert in this area, but hopefully I've
>>>>>>> answered your question.
>>>>>>>
>>>>>>>  David
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>> From Bill's suggestion I have tried to make an example:
>>>>>> http://www.vtk.org/Wiki/VTK_Examples_Interpolation
>>>>>>
>>>>>> the problem is that the Shepard filter outputs an ImageData and the
>>>>>> ContourFilter seems to expect a DataObject.
>>>>>>
>>>>>> Jin, this is a simple version of what you are trying to do, correct?
>>>>>> If so, let try to get this little demo working.
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> David
>>>>>> _______________________________________________
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>>>>>>
>>>>>>
>>>>>>
>>>>>>             
>>>>> _______________________________________________
>>>>> Powered by www.kitware.com
>>>>>
>>>>> Visit other Kitware open-source projects at
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>>>>>
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>>>>>
>>>>>
>>>>>           
>>>> ------------------------------------------------------------------------
>>>>
>>>>         
>>     
>
>

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