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<DIV><FONT face=Arial>Xiaofeng and all,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I am sorry that the question I raised was not clear.
Basically what I wanted to achieve was to reset the camera's original
position. The methods vtkCamera::Azimuth() , vtkCamera::Elevation()
and vtkCamera::Roll() won't do the job unless I keep tracking how much the
camera has rotated about the three axes. For example, the following
code results a roll angle 90, not 0.</FONT></DIV>
<DIV><FONT face=Arial>camera->Roll(30);</FONT></DIV>
<DIV><FONT face=Arial>camera->Roll(60);</FONT></DIV>
<DIV><FONT face=Arial>camera->Roll(0);</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>However, the following code does result in a roll angle
0.</FONT></DIV>
<DIV><FONT face=Arial>camera->Roll(30);</FONT></DIV>
<DIV><FONT face=Arial>camera->Roll(60);</FONT></DIV>
<DIV><FONT face=Arial>camera->SetRoll(0);</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>My question was why there is no similar SetAzimuth() and
SetElevation() methods in the class vtkCamera() and how to achieve my goal using
other methods easily.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Thank you.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Chen</FONT></DIV>
<DIV><FONT face=Arial> </FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=xf10036@hotmail.com href="mailto:xf10036@hotmail.com">Xiaofeng Z</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=huameichen0523@gmail.com
href="mailto:huameichen0523@gmail.com">Hua-Mei Chen</A> ; <A
title=vtkusers@vtk.org href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, September 30, 2008 11:07
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [vtkusers] How to set a
camera's azimuth and elevation?</DIV>
<DIV><BR></DIV>
<TABLE class=memname>
<TBODY>
<TR>
<TD class=memname>Azimuth:<BR> <BR>void vtkamera::Azimuth <BR></TD>
<TD>(</TD>
<TD class=paramtype>double </TD>
<TD class=paramname><EM>angle</EM> </TD>
<TD> )<BR> <BR></TD>
<TD width="100%"></TD></TR></TBODY></TABLE>
<DIV class=memdoc>Rotate the camera about the view up vector centered at the
focal point. Note that the view up vector is not necessarily perpendicular to
the direction of projection. <BR><BR>Xiaofeng Zhao<BR><A
href="http://www.xzing.org" target=_blank>http://www.xzing.org</A> <BR>errare
humanum est<BR><BR><BR>
<HR>
From: <A
href="mailto:huameichen0523@gmail.com">huameichen0523@gmail.com</A><BR>To: <A
href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</A><BR>Date: Tue, 30 Sep 2008
14:46:29 -0500<BR>Subject: [vtkusers] How to set a camera's azimuth and
elevation?<BR><BR>
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<DIV><FONT face=Arial size=2>
<DIV>Hi all,</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> I am wondering how to set a
camera's azimuth and elevation. There is a SetRoll() method in vtkCamera to
set the roll of a camera. However, no similar methods exist for setting the
azimuth and elevation. Does anyone know why? And how do I achieve my goal
using other methods? Thank you.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Chen</FONT></DIV></FONT></DIV>
<DIV> </DIV><BR>
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