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<DIV><FONT face=Arial size=2>How to send TRUE 24 Bit RGB values (in the range 0
to 255 for each R,G,B plane) to vtkTubeFilter for each X,Y,Z
coordinate?</FONT></DIV>
<DIV><FONT face=Arial size=2>I can't seem to get the true color representation?
Is the default some 256 color or something?</FONT></DIV>
<DIV><FONT face=Arial size=2>I am attaching the code I am using.. would be
really nice if someone could point out what is going wrong.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Essentially I have a set of
coordinates alongwith their RGB values and I want a Tube out of
them..</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>warm regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>- Divya Rathore</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>vtkPoints* temp_pts = vtkPoints::New(); // XYZ
coords<BR>vtkPoints* scalar_rgb = vtkPoints::New(); // RGB values</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>// Populate pts and RGB values</FONT></DIV>
<DIV><FONT face=Arial size=2>for(int k=0; k < num_3D_points;
k++)</FONT></DIV>
<DIV><FONT face=Arial size=2>{</FONT></DIV>
<DIV><FONT face=Arial size=2> temp_pts->InsertPoint(k,
<BR> (double)
Data[count1++],
<BR> (double)
Data[count1++],
<BR> (double)
Data[count1++]<BR> );<BR> scalar_rgb->InsertPoint(k,
<BR> (double)
DataRGBval[count2++],
<BR> (double)
DataRGBval[count2++],
<BR> (double)
DataRGBval[count2++]<BR> );
// NOTE*** values in DataRGBval[] are in range [0,255] NOT
[0,1]</FONT></DIV>
<DIV><FONT face=Arial size=2>}</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>// Create the polyline.<BR>vtkCellArray *lines =
vtkCellArray::New();<BR>int numPoints =
temp_pts->GetNumberOfPoints();<BR>lines->InsertNextCell(numPoints); <BR>for
(int j = 0; j < numPoints;
j++) lines->InsertCellPoint(j);</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>// Insert Scalars.<BR>vtkFloatArray *scalars =
vtkFloatArray::New();<BR>scalars->SetNumberOfComponents(3);</FONT></DIV>
<DIV><FONT face=Arial size=2>double pts[3];<BR>for(int j=0; j < numPoints;
j++) <BR>{<BR> scalar_rgb->GetPoint(j,pts);<BR> scalars->InsertTuple3(j,
(float)pts[0]/255.0, (float)pts[1]/255.0, (float)pts[2]/255.0);<BR>} // division
by 255.0 so that data is in range [0,1]</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>vtkPolyData *profileData =
vtkPolyData::New();<BR>profileData->SetPoints((vtkPoints
*)(temp_pts));<BR>profileData->SetLines(lines);<BR>profileData->GetPointData()->SetScalars(scalars);<BR>profileData->BuildLinks();</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>// Add thickness to the resulting
line.<BR>vtkTubeFilter *axesTubes =
vtkTubeFilter::New();<BR>axesTubes->SetNumberOfSides(12);<BR>axesTubes->SetInput(profileData);<BR>axesTubes->SetRadius(0.3);</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>vtkPolyDataMapper *axesMapper =
vtkPolyDataMapper::New();<BR>axesMapper->SetColorModeToMapScalars(); // This
is important i
guess<BR>axesMapper->SetScalarRange(0,numPoints-1);<BR>axesMapper->SetInput(axesTubes->GetOutput());<BR> <BR>vtkActor
*axesActor =
vtkActor::New();<BR>axesActor->SetMapper(axesMapper);</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>ren1->AddActor(axesActor); // add to
renderer<BR></FONT></DIV></BODY></HTML>