Good to hear! Have fun.<br><br>- Wes<br><br><div class="gmail_quote">On Thu, Apr 15, 2010 at 2:28 PM, Robbie Banks <span dir="ltr"><<a href="mailto:robbie.banks@gmail.com">robbie.banks@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Perfect.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">I was rotating 10 degrees at a time, but as you mentioned
because the view up wasn’t sorted, it lost the plot when it hit 90. All working
now.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Thanks</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Robbie</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> Wes Turner
[mailto:<a href="mailto:wes.turner@kitware.com" target="_blank">wes.turner@kitware.com</a>] <br>
<b>Sent:</b> Thursday, April 15, 2010 11:13 AM<br>
<b>To:</b> Robbie Banks<br>
<b>Cc:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><div><div></div><div class="h5"><br>
<b>Subject:</b> Re: [vtkusers] Gimbal Lock?</div></div></span></p>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom: 12pt;">Hey Robbie,<br>
<br>
In general we try to keep cc'ing the conversation to the list. This both
allows for other users to find an answer in the archives and gives you access
to more brains.<br>
<br>
You are probably doing something like;<br>
<br>
camera->Elevation(90);<br>
<br>
After which Elevation no longer works because it rotates around the cross
product of the ViewUp and DirectionOfProjection vectors and you just made them
colinear. if instead you do:<br>
<br>
camera->Elevation(45);<br>
camera->OrtogonalizeViewUp()<br>
camera->Elevation(45);<br>
camera->OrtogonalizeViewUp()<br>
<br>
Everything should continue to work.</p>
<div>
<p class="MsoNormal">On Thu, Apr 15, 2010 at 1:18 PM, Robbie Banks <<a href="mailto:robbie.banks@gmail.com" target="_blank">robbie.banks@gmail.com</a>> wrote:</p>
<div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Hi Wes,</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">I think I understand what you mean, but
could you provide a simple example?</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">R</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> Wes
Turner [mailto:<a href="mailto:wes.turner@kitware.com" target="_blank">wes.turner@kitware.com</a>]
<br>
<b>Sent:</b> Thursday, April 15, 2010 6:27 AM<br>
<b>To:</b> Robbie Banks<br>
<b>Cc:</b> David Doria; <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>Subject:</b> Re: [vtkusers] Gimbal Lock?</span></p>
</div>
<div>
<div>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom: 12pt;">What
you are most likely running into is that the view up vector and the view
direction vector are becoming the same. To reach 90 degrees, do it in two
stages and regenerate the view up vector after each stage.<br>
<br>
- Wes</p>
<div>
<p class="MsoNormal">On
Wed, Apr 14, 2010 at 7:56 PM, Robbie Banks <<a href="mailto:robbie.banks@gmail.com" target="_blank">robbie.banks@gmail.com</a>>
wrote:</p>
<div>
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">I’m just wondering if there is a gimbal
lock issue with the vtkCamera on Elevation(double)??</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">I have a 3D object which I am rotating
using Elevation(), Azimuth() and Roll() to incrementally rotate using
directional push buttons. This works fine for the Azimuth and Roll, but seems
to lock on the Elevation when it hits 90 degrees.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Is this a known problem?</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Robbie</span></p>
</div>
</div>
</div>
</div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><br>
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<p class="MsoNormal"><br>
<br clear="all">
<br>
-- <br>
Wesley D. Turner, Ph.D.<br>
Kitware, Inc.<br>
Technical Leader<br>
28 Corporate Drive<br>
Clifton Park, NY 12065-8662<br>
Phone: 518-881-4920</p>
</div>
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</div>
<p class="MsoNormal"><br>
<br clear="all">
<br>
-- <br>
Wesley D. Turner, Ph.D.<br>
Kitware, Inc.<br>
Technical Leader<br>
28 Corporate Drive<br>
Clifton Park, NY 12065-8662<br>
Phone: 518-881-4920</p>
</div></div></div>
</div>
</blockquote></div><br><br clear="all"><br>-- <br>Wesley D. Turner, Ph.D.<br>Kitware, Inc.<br>Technical Leader<br>28 Corporate Drive<br>Clifton Park, NY 12065-8662<br>Phone: 518-881-4920<br>