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If you need a 3d volume of bitmaps that are all the same x,y size, just
do the same thing, but add an iteration over the z-dimension. The
vtkImageData object supports 3 dimensions. Then, for each distinct
value of z, you'll be jamming a separate bitmap into a given z-slice of
the vtkImageData.<br>
<br>
In the example, change the SetDimensions call to include more than one
z value:<br>
imageData->SetDimensions(16, 16, <b>16</b>);<br>
<br>
Then add another loop to fill in the z data:<br>
int k = 0;<br>
for (k= 0; k<16; ++k) // as outer loop; i and j loops in here;
conecptually, first slice filled is z=0, next z=1 and so on...<br>
<br>
Then simply use the imageData object as the input to your algorithm,
just like you would have used the output of the BMP reader...<br>
<br>
<br>
David<br>
<br>
<br>
med ali wrote:
<blockquote
cite="mid20050609174215.91108.qmail@web26403.mail.ukl.yahoo.com"
type="cite">
<div>hi David,</div>
<div> </div>
<div>thanks for this example </div>
<div> </div>
<div>this example work for one array but i want do that for many
arrays of bmp images </div>
<div>because after i will pass the output to the <font size="2">vtkImageMarchingCubes
.</font></div>
<div> </div>
<div>how can i do this without using vtkBMPReader.</div>
<div> </div>
<div>regards </div>
<div>dali</div>
<div> </div>
<div><font size="2">
<p> </p>
<p>/////////////////////////////////////////////////////// the code
///////////////////////////////////////////</p>
<p><font color="#ff007f">vtkBMPReader *bmpreader=vtkBMPReader ::New();</font></p>
<p><font color="#ff007f">bmpreader->SetFilePrefix (prefix);</font></p>
<p><font color="#ff007f">bmpreader->SetFileNameSliceOffset(1);</font></p>
<p><font color="#ff007f">bmpreader->SetFilePattern("%s%d.bmp");</font></p>
<p><font color="#ff007f">bmpreader->SetDataExtent(0,width,
0,height, 0, 31); </font></p>
<p><font color="#ff007f">//319 -( width-1, 239 - (height-1), 10 - (no
of bitmaps-1)</font></p>
<p><font color="#ff007f">bmpreader->SetDataSpacing(1,1,interslices);</font></p>
<p> </p>
<p>//marchingcubes</p>
<p>vtkImageMarchingCubes *MC=vtkImageMarchingCubes ::New();</p>
<p>MC->SetInput(bmpreader->GetOutput());</p>
<p>MC->SetValue(0,iso-value);</p>
<p>MC->GetOutput()->Update();</p>
<p> </p>
<p>////////////////////////////////
///////////////////////////////////////////////////////</p>
</font><br>
<br>
<b><i>David Cole <a class="moz-txt-link-rfc2396E" href="mailto:david.cole@kitware.com"><david.cole@kitware.com></a></i></b> a écrit :</div>
<blockquote class="replbq"
style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;">Please
keep questions/replies on the list in case somebody else has time to
respond sooner. (Next time, keep cc'ing <a
class="moz-txt-link-abbreviated" href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a>...)<br>
<br>
Here's a small example that builds a vtkImageData from raw r,g,b values
and shows it in a render window. It's an adaptation and reduction of
VTK/Examples/Tutorial/Step6/Cxx/Cone6.cxx. I've eliminated the cone
source/mapper/actor and added a vtkImageData and vtkImageActor.<br>
<br>
The important pieces of the puzzle are SetScalarTypeToUnsignedChar and
SetNumberOfScalarComponents(3). Then you can fill in the r,g,b values
to your liking in a loop after allocating the scalars. If you already
have a bitmap allocated and filled in, there's probably a way for you
to set that data in as the scalar data here as long as it is laid out
properly: r, g, b sequentially for each pixe! l as shown here. I'll let
somebody else who's done that before chime in if you need more help. :-)<br>
<br>
//====================<SampleCode>====================<br>
#include "vtkImageActor.h"<br>
#include "vtkImageData.h"<br>
#include "vtkInteractorStyleTrackballCamera.h"<br>
#include "vtkRenderer.h"<br>
#include "vtkRenderWindow.h"<br>
#include "vtkRenderWindowInteractor.h"<br>
<br>
int main()<br>
{<br>
vtkImageData *imageData = vtkImageData::New();<br>
imageData->SetScalarTypeToUnsignedChar();<br>
imageData->SetNumberOfScalarComponents(3);<br>
imageData->SetDimensions(16, 16, 1);<br>
imageData->AllocateScalars();<br>
<br>
int i = 0;<br>
int j = 0;<br>
unsigned char r = 0;<br>
unsigned char g = 0;<br>
unsigned char b = 0;<br>
unsigned char *data = (unsigned char *)
imageData->GetScalarPointer();<br>
for (i= 0; i<16; ++i)<br>
for (j= 0; j<16; ++j)<br>
{<br>
// Checkerboard test pattern with red, green, blue and black
quadrants:<br>
if ((j+i) % 2)<br>
{<br>
r= g= b= 0;<br>
<br>
if (i>7 && j>7)<br>
{<br>
r= 255;<br>
}<br>
else if (i>7)<br>
{<br>
b= 255;<br>
}<br>
else if (j>7)<br>
{<br>
g= 255;<br>
}<br>
}<br>
else<br>
{<br>
// White on the "other" part of the checkerboard:<br>
r= g= b= 255;<br>
<br>
// Grayscale ramp:<br>
//r= g= b= 16*i + j;<br>
}<br>
<br>
*data++ = r;<br>
*data++ = g;<br>
*data++ = b;<br>
}<br>
<br>
vtkImageActor *imageActor = vtkImageActor::New();<br>
imageActor->SetInput(imageData);<br>
imageActor->InterpolateOff();<br>
<br>
vtkRenderer *ren1= vtkRenderer::New();<br>
ren1->AddActor( imageActor );<br>
ren1->SetBackground( 0.1, 0.2, 0.4 );<br>
<br>
vtkRenderWindow *renWin = vtkRenderWindow::New();<br>
renWin->AddRenderer( ren1 );<br>
renWin->SetSize( 300, 300 );<br>
<br>
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();<br>
iren->SetRenderWindow(renWin);<br>
<br>
vtkInteractorStyleTrackballCamera *style =
vtkInteractorStyleTrackballCamera::New();<br>
iren->SetInteractorStyle(style);<br>
<br>
iren->Initialize();<br>
iren->Start();<br>
<br>
imageActor->Delete();<br>
imageData->Delete();<br>
ren1->Delete();<br>
renWin->Delete();<br>
iren->Delete();<br>
style->Delete();<br>
<br>
return 0;<br>
}<br>
//====================</SampleCode>====================<br>
<br>
<br>
Hope this helps you get a little further,<br>
David<br>
<br>
<br>
<br>
med ali wrote:
<blockquote
cite="mid20050607153402.74432.qmail@web26407.mail.ukl.yahoo.com"
type="cite">
<div>Hi,</div>
<div> </div>
<div>thanks you,</div>
<div>but i 'am begginer in vtk </div>
<div>can you give me a short example that i can begin with .</div>
<div> </div>
<div>thanks,</div>
<div> </div>
<div>dali<br>
<br>
<b><i>David Cole <a class="moz-txt-link-rfc2396E"
href="mailto:david.cole@kitware.com"><david.cole@kitware.com></a></i></b>
a écrit :</div>
<blockquote class="replbq"
style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;">The
output of vtkBMPReader (which is derived from vtkImageAlgorithm) is a
vtkImageData. Just construct a vtkImageData directly from your data
with the correct dimensions, scalar type and underlying data rather
than using vtkBMPReader.<br>
<br>
med ali wrote:
<blockquote
cite="mid20050607144554.60708.qmail@web26407.mail.ukl.yahoo.com"
type="cite">
<div>
<p>Hi all,</p>
<p> </p>
<p>i want use vtkBMPReader but not directly on the files </p>
<p> instead of passing the prefix of slices can i pass the
array data of pixels to vtkBMPReader</p>
<font size="2"><font size="2">
<p>/* </p>
<p>bmp= vtkBMPReader::New();</p>
</font></font>
<p><font size="2">bmp->SetFilePrefix (prefix);</font></p>
<p><font size="2">bmp->SetFileNameSliceOffset(1);</font></p>
<p><font size="2">bmp->SetFilePattern("%s%d.bmp");</font></p>
<p><font size="2">*/</font></p>
</div>
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