<br><font size=2 face="Courier New">Help</font>
<br>
<br><font size=2 face="Courier New">I've spent enough hours trying to stop
VtkOutputWindow from popping up with this error:</font>
<br>
<br><font size=2 color=#000080 face="Courier New">ERROR: In ..\..\vtk\Filtering\vtkStreamingDemandDrivenPipeline.cxx,
line 628</font>
<br><font size=2 color=#000080 face="Courier New">vtkStreamingDemandDrivenPipeline
(061A8E28): The update extent specified in the information for output port
0 on algorithm vtkTrivialProducer(061AE298) is 0 31 0 31 0 31, which is
outside the whole extent 0 32 0 27 0 9.</font>
<br>
<br><font size=2 face="Courier New">Our volume rendering is working fine!
But this error message won't go away. Our data is loaded into
a vtkRectilinearGrid (any resolution - 32x27x9 is just one of many possibilities).
To do volume rendering we create a 32x32x32 vtkImageData grid and
resample the vtkRectilinearGrid data using vtkProbeFilter (see code below).
Like I said, everything works great. The volume rendering appears
and behaves very well. The only problem is that this error message
pops up with the VtkOutputWindow. I looks like the vtkImageData object
(32x32x32) has inherited the "whole extent" of the original vtkRectilinearGrid
(33x28x10)? This doesn't make sense.... somebody please help....</font>
<br>
<br>
<br><font size=2 face="Courier New">Note: Code is in Visual Basic
(We are using Andrew Dolgert's ".NET Wrappers for VTK 5" - works
great!)</font>
<br>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Private</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">Sub</font><font size=2 face="Courier New">
LoadVolumeActor()</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'Create
a rectilinear grid (any resolution and spacing in X, Y, and Z)</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim
</font><font size=2 face="Courier New">vtkGrid3D</font><font size=2 color=blue face="Courier New">
as </font><font size=2 face="Courier New">vtk.vtkRectilinearGrid</font><font size=2 color=blue face="sans-serif">
= </font><font size=2 color=blue face="Courier New">Me</font><font size=2 face="Courier New">.LoadRectilinearGrid()</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'Create
the image data grid</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
ImageGrid </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkImageData</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
nx </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">Integer</font><font size=2 face="Courier New">
= 32</font>
<br><font size=2 face="Courier New"> ImageGrid.SetDimensions(nx,
nx, nx)</font>
<br><font size=2 face="Courier New"> ImageGrid.SetOrigin(m_sngGridMinX,
m_sngGridMinY, m_sngGridMinZ)</font>
<br><font size=2 face="Courier New"> ImageGrid.SetSpacing((m_sngGridMaxX
- m_sngGridMinX) / (nx - 1), _</font>
<br><font size=2 face="Courier New">
(m_sngGridMaxY
- m_sngGridMinY) / (nx - 1), _</font>
<br><font size=2 face="Courier New">
(m_sngGridMaxZ
- m_sngGridMinZ) / (nx - 1))</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'Use
probe filter to get scalar values for image data grid</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
Probe </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkProbeFilter</font>
<br><font size=2 face="Courier New"> Probe.SetInput(ImageGrid)</font>
<br><font size=2 face="Courier New"> Probe.SetSource(m_vtkGrid3D)</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'Convert
the image data grid scalars from float to unsigned character</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
ScalarMin, ScalarMax </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">Double</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Me</font><font size=2 face="Courier New">.GetScalarMinMax(vtkGrid3D,
ScalarMin, ScalarMax)</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
Shift </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">Double</font><font size=2 face="Courier New">
= -ScalarMin</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
Scale </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">Double</font><font size=2 face="Courier New">
= 255.0 / (ScalarMax - ScalarMin)</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
ShiftScale </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkImageShiftScale</font>
<br><font size=2 face="Courier New"> ShiftScale.SetShift(Shift)</font>
<br><font size=2 face="Courier New"> ShiftScale.SetScale(Scale)</font>
<br><font size=2 face="Courier New"> ShiftScale.SetOutputScalarTypeToUnsignedChar()</font>
<br><font size=2 face="Courier New"> ShiftScale.SetInput(Probe.GetImageDataOutput)</font>
<br>
<br><font size=2 color=#008000 face="Courier New">
'Volume function</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
VolumeFunction </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkVolumeRayCastMIPFunction</font>
<br><font size=2 face="Courier New"> VolumeFunction.SetMaximizeMethodToScalarValue()
</font><font size=2 color=#008000 face="Courier New">'Default method</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'VolumeFunction.SetMaximizeMethodToOpacity()
'Alternate method</font>
<br>
<br><font size=2 color=#008000 face="Courier New">
'Volume mapper</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
VolumeMapper </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkVolumeRayCastMapper</font>
<br><font size=2 face="Courier New"> VolumeMapper.SetVolumeRayCastFunction(VolumeFunction)</font>
<br><font size=2 face="Courier New"> VolumeMapper.SetSampleDistance((m_sngGridMaxX
- m_sngGridMinX) / ((nx - 1) * 3))</font>
<br><font size=2 face="Courier New"> VolumeMapper.SetInput(ShiftScale.GetOutput)</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'Opacity
transfer function</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
OpacityTransferFunction </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkPiecewiseFunction</font>
<br><font size=2 face="Courier New"> OpacityTransferFunction.AddPoint(0.0,
0.7)</font>
<br><font size=2 face="Courier New"> OpacityTransferFunction.AddPoint(255.0,
0.7)</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'Volume
property</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
VolumeProperty </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkVolumeProperty</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'VolumeProperty.SetInterpolationTypeToNearest()
'Default - faster, course image</font>
<br><font size=2 face="Courier New"> VolumeProperty.SetInterpolationTypeToLinear()
</font><font size=2 color=#008000 face="Courier New">'Smoother -
slower, smooth image</font>
<br><font size=2 face="Courier New"> VolumeProperty.SetScalarOpacity(OpacityTransferFunction)</font>
<br><font size=2 face="Courier New"> VolumeProperty.SetColor(</font><font size=2 color=blue face="Courier New">Me</font><font size=2 face="Courier New">.CreateLookupTable(ActorIndex,
SetLutOptions.NewLUT, Shift, Scale))</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=#008000 face="Courier New">'Volume
actor</font>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">Dim</font><font size=2 face="Courier New">
Volume </font><font size=2 color=blue face="Courier New">As</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">New</font><font size=2 face="Courier New">
vtk.vtkVolume</font>
<br><font size=2 face="Courier New"> Volume.SetMapper(VolumeMapper)</font>
<br><font size=2 face="Courier New"> Volume.SetProperty(VolumeProperty)</font>
<br>
<br><font size=2 face="Courier New"> m_vtkRen1.AddVolume(Volume)</font>
<br><font size=2 face="Courier New"> m_vtkRenWin.Render()</font>
<br>
<br><font size=2 face="Courier New"> </font><font size=2 color=blue face="Courier New">End</font><font size=2 face="Courier New">
</font><font size=2 color=blue face="Courier New">Sub</font>
<br><font size=2 face="sans-serif"><br>
Steve Koch<br>
Applications Developer<br>
<br>
Trinity Consultants, Inc.<br>
skoch@trinityconsultants.com<br>
phone: 972-661-8881 x1332<br>
fax: +214-615-7425<br>
breeze-software.com</font>
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