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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> John Platt
[mailto:jcplatt@lineone.net] <br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>19 April 2005</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>10:27</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> 'Akiko Campbell'<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [vtkusers] why
doesn't my glyph scale?</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Akiko,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Try replacing</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>points->GetCellData()->SetScalars(
eigenValue_1 );</span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>with</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>points->GetPointData()->SetScalars(
eigenValue_1 );</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Below is an extract of some glyph code -
the comments may be helpful.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // The
glyphs can be oriented along the input DataSet vectors or normals.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // Since
spheres have no preferred orientation, switch orientation off.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
m_vtkGlyphs->OrientOff();</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // The
glyphs must be scaled otherwise each glyph will be drawn in</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // World
coordinates. Note that scaling is ON by default.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
m_vtkGlyphs->ScalingOn(); </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // Scaling
is controlled by the composite factor ScaleFactor * DataScale</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // where
the data scale is either</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> //</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
// - point scalars (VTK_SCALE_BY_SCALAR)</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
// - point vector
magnitude (VTK_SCALE_BY_VECTOR)</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
// - point vector
components (VTK_SCALE_BY_VECTORCOMPONENTS)</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> //</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // Scaling
due to data (scalars, vectors, or normals can be disabled</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> // using
SetScaleModeToDataScalingOff()). The glyph scale can also be</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> //
controlled by mapping the data scale to a specified range, then</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> //
multiplying by the scale factor.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>John.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> vtkusers-bounces@vtk.org
[mailto:vtkusers-bounces@vtk.org] <b><span style='font-weight:bold'>On Behalf
Of </span></b>Akiko Campbell<br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>19 April 2005</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>00:32</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> vtkusers@vtk.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [vtkusers] why doesn't my
glyph scale?</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hello,</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>I have a set of points
I’d like to visualize with glyphs but glyphs don’t seem to scale at
all. I read in point’s vector components into a float array
(eigenVector_1) and corresponding magnitude data into another float array
(eigenValue_1). Since magnitude information is stored in a separate array
as scalars, I would like to use SetScaleModeToScaleByScalar() to scale glyphs
but all glyphs are exactly the same shape and are directed in the same
direction. I am wondering if something I’m doing is wrong
here. Could someone give me an insight? Thank you!</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>vtkPolyData *points =
reader->GetOutput();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>const</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>unsigned</span></font> <font color=blue><span
style='color:blue'>int</span></font> numberOfPoints =
vpoints->GetNumberOfPoints();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>vtkFloatArray
*eigenVector_1 = vtkFloatArray::New();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>eigenVector_1->SetNumberOfComponents(
3 );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>eigenVector_1->SetNumberOfTuples(
numberOfPoints );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>vtkFloatArray
*eigenValue_1 = vtkFloatArray::New();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>eigenValue_1->SetNumberOfTuples(
numberOfPoints );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>//************************************************</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>A brief version of loop to
populate the arrays:</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
color=blue face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>for</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> (<font color=blue><span
style='color:blue'>unsigned</span></font> <font color=blue><span
style='color:blue'>int</span></font> ctr=0; ctr < numberOfPoints; ctr++){</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> eigenVector_1->SetComponent(
ctr, 0, voxelValue_1_X[X] );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span lang=ES-MX style='font-size:10.0pt;font-family:"Courier New"'> eigenVector_1->SetComponent(
ctr, 1, voxelValue_1_Y[Y] );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
lang=ES-MX style='font-size:10.0pt;font-family:"Courier New"'> </span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>eigenVector_1->SetComponent(
ctr, 2, voxelValue_1_Z[Z] );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> eigenValue_1->SetValue(
ctr, pixelValue[X] );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>}</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>//************************************************</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>//Set the vectors and
scalars </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>points->GetPointData()->SetVectors(
eigenVector_1 ); </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>points->GetCellData()->SetScalars(
eigenValue_1 );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>vtkSphereSource
*source = vtkSphereSource::New();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>source->SetThetaResolution(
6 );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>source->SetPhiResolution(
5 );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>source->SetRadius( 0.5 );</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>vtkGlyph3D *glyph =
vtkGlyph3D::New();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>glyph->SetInput(points);</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>glyph->SetSource(source->GetOutput());</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>glyph->ScalingOff();
// I read somewhere I need to set this off…even with ScalingOn(), no
scaling happens. </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>glyph->OrientOn();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>glyph->SetVectorModeToUseVector();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>glyph->SetScaleModeToScaleByScalar();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>glyph->SetColorModeToColorByScalar();</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>glyph->Update();</span></font></p>
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