<div dir="ltr"><div><div><div></div>There are multiple choices.<br><br>You can create the same number of cylinders as number of colors with height divided by number of colors.</div><div><br>a) then define transformation for 2 actors so each actor is above another <br>
</div><div><br><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/TransformActor">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/TransformActor</a><br><br><br></div><div>b) modify created polydata using transformFilter:<br>
</div><div><br><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/TransformFilter">http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/TransformFilter</a><br><br></div><br></div>Google "vtk example transformation"<br>
<div><div><div><div><div><div><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Arindam</b> <span dir="ltr"><<a href="mailto:arindam@triassicsolutions.com">arindam@triassicsolutions.com</a>></span><br>
Date: Tue, May 7, 2013 at 10:16 PM<br>Subject: Re: [vtkusers] How to color cylinder with different colors<br>To: Alex Malyushytskyy <<a href="mailto:alexmalvtk@gmail.com">alexmalvtk@gmail.com</a>><br><br><br>
<div bgcolor="#FFFFFF" text="#000000">
<div>If i m combining 2 cylinder i m getting
like following.How can i make cylinders on top of each other?<br>
<br>
<img src="" alt=""><div><div class="h5"><br>
<br>
On 5/8/2013 3:30 AM, Alex Malyushytskyy wrote:<br>
</div></div></div><div><div class="h5">
<blockquote type="cite">
<div dir="ltr">Or you can create 3 cylinders (1 for each color) on
top of each other if you want to follow your own approach.<br>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Tue, May 7, 2013 at 2:58 PM, Alex
Malyushytskyy <span dir="ltr"><<a href="mailto:alexmalvtk@gmail.com" target="_blank">alexmalvtk@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>
<div>Your cylinder source produces polydata.<br>
</div>
<br>
Common ways to define color for polydata in vtk for
cells or nodes ( in your case you want cells ) <br>
</div>
is either define color as rgb values in a char array:<br>
<div>
<div><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/TriangleSolidColor" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/TriangleSolidColor</a><br>
<br>
or as a value which later can be mapped using LookUp
table:<br>
<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ColorCells" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ColorCells</a><br>
<br>
</div>
<div>You will have to make sure your cylinder has at
least 3 cells along the axis to obtain desired
results.<br>
<br>
</div>
<div>Alex<br>
</div>
<div><br>
<br>
</div>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">
<div>
<div>On Mon, May 6, 2013 at 10:03 PM, Divya
<span dir="ltr"><<a href="mailto:divya@triassicsolutions.com" target="_blank">divya@triassicsolutions.com</a>></span>
wrote:<br>
</div>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div>
<div text="#000000" bgcolor="#FFFFFF"> Dear All,<br>
<br>
I want to color a cylinder like the image
attached. I have tried combining 2 different
cylinder source with different colors but I am
getting the following result<br>
<img src="" alt=""><br>
<br>
Any help will be greatly appreciated.<br>
<br>
My source code is as follows:<br>
<br>
vtkCylinderSource catheter =
vtkCylinderSource.New();<br>
catheter.SetRadius(1);<br>
catheter.SetHeight(15.0);<br>
catheter.Update();<br>
//catheter.CappingOn();<br>
<br>
vtkFloatArray cylColor1 =
vtkFloatArray.New();<br>
cylColor1.SetNumberOfComponents(3);<br>
cylColor1.SetName("Color1");<br>
<br>
for (int i = 0; i <
catheter.GetOutput().GetNumberOfPoints(); i++)<br>
{<br>
cylColor1.InsertTuple3(i, 255,
0, 0);<br>
}<br>
catheter.GetOutput().GetPointData().SetScalars(cylColor1);<br>
<br>
vtkCylinderSource catheter2 =
vtkCylinderSource.New();<br>
catheter2.SetRadius(1);<br>
catheter2.SetHeight(10.0);<br>
catheter2.Update();<br>
//catheter2.CappingOn();<br>
<br>
vtkFloatArray cylColor =
vtkFloatArray.New();<br>
cylColor.SetNumberOfComponents(3);<br>
cylColor.SetName("Color2");<br>
<br>
for (int i = 0; i <
catheter2.GetOutput().GetNumberOfPoints(); i++)<br>
{<br>
cylColor.InsertTuple3(i, 0, 0,
255);<br>
}<br>
catheter2.GetOutput().GetPointData().SetScalars(cylColor);<br>
<br>
// append both polydata sets<br>
vtkAppendPolyData apd = new
vtkAppendPolyData();<br>
apd.AddInput(catheter.GetOutput());<br>
apd.AddInput(catheter2.GetOutput());<br>
apd.Update();<br>
<br>
////vtkCleanPolyData cleanFilter =
vtkCleanPolyData.New();<br>
////cleanFilter.SetInput(apd.GetOutput());<br>
////cleanFilter.Update();<br>
<br>
vtkPolyDataMapper catheterMapper =
vtkPolyDataMapper.New();<br>
catheterMapper.SetInputConnection(apd.GetOutputPort());<br>
catheterActor.SetMapper(catheterMapper);<span><font color="#888888"><br>
<br>
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