<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">For this, you should probably use something to slice the 3D volume to get a 2D slice. You can use vtkExtractVOI with the correct extents to pull out the slice and use that as your input. Probably a pipeline like this:<div><br></div><div>Input -> vtkExtractVOI -> vtkImageMapToColors -> vtkTexture.</div><div><br></div><div>For arbitrary slicing (not on the X, Y or Z axes), you would use vtkImageReslice.<br><br><div>Shash</div><div><br>On 28-Jun-2018, at 2:00 PM, Eva Monclús <<a href="mailto:emonclus@cs.upc.edu">emonclus@cs.upc.edu</a>> wrote:<br><br></div><blockquote type="cite"><div>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 27/06/2018 16:12, Sankhesh Jhaveri
wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAEcL5t4Vp=n9UJJys7EH4PgsEFnE-Pr3uK8TTMA57jwLf+6uFw@mail.gmail.com">
<div dir="ltr">
<div class="markdown-here-wrapper" style="font-family:"Lucida
Sans",Cantarell,Verdana,sans-serif;color:rgb(11,83,148)">
<p style="margin:0px 0px 1.2em!important">You should be able
to get the output of the mapper as vtkImageData and then use
GetScalarPointer() to access the raw data.</p>
</div>
</div>
</blockquote>
I have tried to bind the vtkImageData as the InputData of the
vtkTexture, using: <br>
vtkImageActor *saggital;<br>
.........<br>
vtkImageData *image_data =
sagittal->GetMapper()->GetInput();<br>
texture->SetInputData(image_data);<br>
<br>
but I get the following openGL error:<br>
<blockquote><i>ERROR: In
D:\workspace.64\VTK-7.0.0\Rendering\OpenGL2\vtkOpenGLTexture.cxx,
line 224</i><br>
<i>vtkOpenGLTexture (000001EAAB506E60): 3D texture maps currently
are not supported!</i><br>
</blockquote>
I know that my vtkImageData is a 3D volume data but I hope that
because the vtkImageActor is just rendering a 2D slice of the volume
dataset, there was a way of obtaining it.<br>
<br>
Thanks in advance,<br>
Eva<br>
<br>
<br>
<blockquote type="cite" cite="mid:CAEcL5t4Vp=n9UJJys7EH4PgsEFnE-Pr3uK8TTMA57jwLf+6uFw@mail.gmail.com">
<div dir="ltr">
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<div title="MDH:WW91IHNob3VsZCBiZSBhYmxlIHRvIGdldCB0aGUgb3V0cHV0IG9mIHRoZSBtYXBwZXIgYXMgdnRrSW1hZ2VEYXRhIGFuZCB0aGVuIHVzZSBHZXRTY2FsYXJQb2ludGVyKCkgdG8gYWNjZXNzIHRoZSBy
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<br>
<div class="gmail_quote">
<div dir="ltr">On Wed, Jun 27, 2018 at 9:49 AM Eva Monclús <<a href="mailto:emonclus@cs.upc.edu" moz-do-not-send="true">emonclus@cs.upc.edu</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Thanks a lot for the quickly answer, but my problem is
that I want to use the output of the vtkImageActor in a
different graphic object (another 3D plane) and I do not
know how to manage it. <br>
</p>
<p>In very, very technical words, I want to get access to
the unsigned char * that it is being rendering using the
vtkImageActor.</p>
<p>Thanks in advance,</p>
<p> Eva</p>
</div>
<div text="#000000" bgcolor="#FFFFFF">
<p><br>
</p>
<br>
<div class="m_-7534516313208078740moz-cite-prefix">On
27/06/2018 15:22, Sankhesh Jhaveri wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="m_-7534516313208078740markdown-here-wrapper">
<p style="margin:0px 0px 1.2em!important">Hi Eva,</p>
<p style="margin:0px 0px 1.2em!important"><code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline">vtkImageActor</code>
is a 2D textured plane in a 3D space. Make sure that
you use the <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline">vtkImageMapper3D</code>
(default mapper) with it.<br>
If you’re just looking for 3D interaction with the
actor, use an interactor style like <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline">vtkInteractorStyleTrackballCamera</code>.</p>
<p style="margin:0px 0px 1.2em!important">Hope that
helps.</p>
<p style="margin:0px 0px 1.2em!important">Thanks,<br>
Sankhesh</p>
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<br>
<div class="gmail_quote">
<div dir="ltr">On Wed, Jun 27, 2018 at 9:17 AM Eva
Monclús <<a href="mailto:emonclus@cs.upc.edu" target="_blank" moz-do-not-send="true">emonclus@cs.upc.edu</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hello everyone,</p>
<p>I'm working with a volume dataset (temporal Dicom
serie) and I´m able to visualize the slices using
the following vtk C++ classes:</p>
<ul>
<li>vtkImageData: represents the volume dataset</li>
<li>vtkImageMapToColors: I use this class to
define the transfer function to be used in the
rendering</li>
<li>vtkImageActor: I use this class to render a
specific slice of the volume dataset <br>
</li>
</ul>
Until here everything it is fine. I can render the
slice I want using the classes before mentioned
changing the SetDisplayExtent of the vtkImageActor.<br>
<br>
Now I want to visualize the output of my
vtkImageActor as a 2D texture in a free 3D plane.
Then, I consider to have the following classes:<br>
<ul>
<li> I use a vtkPlaneSource to define the 3D
plane: orientation and position</li>
<li>a vtkTexture that has to be attached to the
vtkPlaneSource. My problem comes out with the
definition of the SetInputConnection of the
vtkTexture. I want to define the image as the
output of the vtkImageActor. But I do not get
it.</li>
</ul>
I am successful in visualizing the vtkPlane in
black color (due to the texture is not well
defined) unfortunately, I can't get it to work
properly with a texture of a specific slice of the
volume dataset. I have tried different ways of
assigning the SetInputConnection of the vtkTexture
using the vtkImageActor, but none of them worked
well. <br>
<br>
Any help will be welcome. Thank you very much in
advance,<br>
<br>
Eva<br>
<br>
<br>
<br>
</div>
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