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<DIV><FONT face=Arial size=2>Hello Shade,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Why are you performing an image reslice to rotate
your data? There is an image flip filter than can flip your data around if your
read it in with the wrong orientation - I think it is probably a bit more
efficient than the generic reslice. Otherwise, you should simply rotate your
camera around to view it from another angle.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>One thing you can do to find out if your reslice is
producing data is to do an update then get the scalar range to find out if there
is any data in the volume.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Lisa</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A href="mailto:shade_cn@yahoo.com" title=shade_cn@yahoo.com>Shade</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
href="mailto:lisa.avila@kitware.com" title=lisa.avila@kitware.com>Lisa S.
Avila</A> ; <A href="mailto:vtkusers@public.kitware.com"
title=vtkusers@public.kitware.com>vtkusers@public.kitware.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, October 29, 2001 8:48
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [vtkusers] About Volume
Rendering in vtkNightly</DIV>
<DIV><BR></DIV>
<DIV><FONT face=宋体 size=2>Hello Lisa,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=宋体 size=2> Thank you for your
help.</FONT></DIV>
<DIV><FONT face=宋体 size=2> I don't use the abstract
superclass Mapper directly, I use the </FONT></DIV>
<DIV><FONT face=宋体 size=2>vtkVolumeTextureMapper2D and vtkVolumeProMapper
instead. Today I debug </FONT></DIV>
<DIV><FONT face=宋体 size=2>my application again and found the following
reason.</FONT></DIV>
<DIV><FONT face=宋体 size=2> Following is my sample
code:</FONT></DIV>
<DIV><FONT face=宋体
size=2>======================================================</FONT></DIV>
<DIV><FONT face=宋体 size=2> vtkStructurePoints pStructuredPointsData =
vtkStructurePoints::New();</FONT></DIV>
<DIV><FONT face=宋体
size=2>////////////////////////////////////////////////////////////////////</FONT></DIV>
<DIV><FONT face=宋体 size=2> Read the volume data</FONT></DIV>
<DIV><FONT face=宋体
size=2>////////////////////////////////////////////////////////////////////</FONT></DIV>
<DIV><FONT face=宋体 size=2> vtkTransform *pTransform =
NULL;<BR> pTransform = vtkTransform::New();</FONT></DIV>
<DIV><FONT face=宋体 size=2>// the next red color sentence is
important<BR><FONT
color=#ff0000> pTransform->RotateX(90);</FONT></FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=宋体 size=2> // reslice the volume data to rotate
it.</FONT></DIV>
<DIV><FONT face=宋体 size=2><FONT face=宋体 size=2> vtkImageReslice
*pImageReslice</FONT> = vtkImageReslice::New();</FONT></DIV>
<DIV><FONT face=宋体
size=2> pImageReslice->SetInput(pStructuredPointsData);<BR> pImageReslice->SetResliceTransform(pTransform);<BR></FONT></DIV>
<DIV><FONT face=宋体 size=2>// Get the volume data after reslice</DIV></FONT>
<DIV><FONT face=宋体 size=2> vtkImageData *pImageData =
m_pImageReslice->GetOutput();</FONT></DIV>
<DIV><FONT face=宋体
size=2>////////////////////////////////////////////////////////////////////</FONT></DIV>
<DIV><FONT face=宋体 size=2> Then set the pImageData as the Volume
Mapper(vtkVolumeProMapper, </FONT></DIV>
<DIV><FONT face=宋体 size=2>vtkVolumeTextureMapper2D, etc.) input to render
it.</FONT></DIV>
<DIV><FONT face=宋体
size=2>////////////////////////////////////////////////////////////////////</FONT></DIV>
<DIV><FONT face=宋体
size=2>==================================================================</FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV><FONT face=宋体 size=2> But strange phenomena appear.
With the above <FONT color=#ff0000>red color</FONT> sentence, </FONT></DIV>
<DIV><FONT face=宋体 size=2>then the render will display nothing what I
mentioned in the last mail; </FONT></DIV>
<DIV><FONT face=宋体 size=2>without the <FONT color=#ff0000>red color</FONT>
sentence then everything is OK.</FONT></DIV>
<DIV><FONT face=宋体 size=2> I don't know whether the
vtkTransform has problem or the </FONT></DIV>
<DIV><FONT face=宋体 size=2>vtkImageReslice has problem or my rendering methos
has problem. </FONT></DIV>
<DIV><FONT face=宋体 size=2> Can you give me some advice?
Thank you.</FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV><FONT face=宋体 size=2>Yours,</FONT></DIV>
<DIV><FONT face=宋体 size=2>Shade</FONT></DIV>
<DIV><FONT face=宋体 size=2> </DIV></FONT>
<DIV><FONT face=宋体 size=2>----- Original Message ----- </FONT></DIV>
<DIV>
<DIV><FONT face=宋体 size=2>From: "Lisa S. Avila" <</FONT><A
href="mailto:lisa.avila@kitware.com"><FONT face=宋体
size=2>lisa.avila@kitware.com</FONT></A><FONT face=宋体 size=2>></FONT></DIV>
<DIV><FONT face=宋体 size=2>To: "Shade" <</FONT><A
href="mailto:shade_cn@yahoo.com"><FONT face=宋体
size=2>shade_cn@yahoo.com</FONT></A><FONT face=宋体 size=2>>; <</FONT><A
href="mailto:vtkusers@public.kitware.com"><FONT face=宋体
size=2>vtkusers@public.kitware.com</FONT></A><FONT face=宋体
size=2>></FONT></DIV>
<DIV><FONT face=宋体 size=2>Sent: Monday, October 29, 2001 2:06 PM</FONT></DIV>
<DIV><FONT face=宋体 size=2>Subject: Re: [vtkusers] About Volume Rendering in
vtkNightly</FONT></DIV></DIV>
<DIV><BR></DIV><FONT face=宋体 size=2>> Hello Shade,<BR>> <BR>> What
mapper are you using? You indicate vtkVolumeMapper in your email, but<BR>>
it is not valid (hopefully not possible!) to use a vtkVolumeMapper for<BR>>
rendering - it is an abstract superclass.<BR>> <BR>> Lisa<BR>>
<BR>> ----- Original Message -----<BR>> From: "Shade" <</FONT><A
href="mailto:shade_cn@yahoo.com"><FONT face=宋体
size=2>shade_cn@yahoo.com</FONT></A><FONT face=宋体 size=2>><BR>> To:
<</FONT><A href="mailto:vtkusers@public.kitware.com"><FONT face=宋体
size=2>vtkusers@public.kitware.com</FONT></A><FONT face=宋体 size=2>><BR>>
Sent: Friday, October 26, 2001 10:58 PM<BR>> Subject: [vtkusers] About
Volume Rendering in vtkNightly<BR>> <BR>> <BR>> > Dear VTK
Users,<BR>> ><BR>> > I download the vtk
nightly version of 2001/10/25 and<BR>> > 2001/10/26, but I can't render
anything with Volume Mapper,it<BR>> > seems the lookup table has no
effect to the volume, all the<BR>> > volume cell color is the background
color, so in the render<BR>> > window, it seems there is nothing. If I
use the VTK3.2<BR>> > Official Release, it is no problem. I can't find
the reason,<BR>> > who can give me some hints, thanks a lot.<BR>>
><BR>> > Best Regards,<BR>> > Shade<BR>> ><BR>>
><BR>> > _______________________________________________<BR>> >
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