[vtkusers] 3D .raw data density values

[tony hakki]

hi;
Michael you were right,vtkProbefilter is suitable way to get point at  a certain point.  You mentioned that  "the output depends on what interpolation type you choose (linear/cubic..)." how can I specified interpolation type,I would like to use trilinear interpolation type? Could you give a sample code to understand vtkprobefilter using structure? If someone can add something from their knowledge it will be appreciated too.
thanks in advance
Tony


----- Original Message ----
From: Michael Knopke <Michael.Knopke at gmx.de>
To: vtkusers at vtk.org
Sent: Tuesday, March 6, 2007 2:43:56 PM
Subject: [vtkusers] 3D .raw data density values


Hi Tony,
I’m not sure if this is alright, so use with care J
 
If your dataset is vtkImageData (I guess so) then you can use:
 
vtkImageData->FindPoint(double x[3]); //where x is in worldspace coordinates
 
But this will only find the closest point belonging to your original dataset. So if you select a point in worldspace that has no direct association to a point in imagedata, the value is not correct.
Data in between needs to be interpolated. A way to get the interpolated point at a certain position is to use the vtkProbeFilter with your imagedata. But the output depends on what interpolation type you choose (linear/cubic..).
 
Please correct me If I’m wrong.
 
Regards
Michael
 
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