<div>Hi Michael,</div>
<div> </div>
<div>I think the simplest explanation is that these values are compounded into the homogenous matrix that directly specifies the orientation. As such because the homogenous matrix is the product of one or all of these values plus any other orientation/rotation/translation values it will never be possible, except in very simple single parameter cases, to extract out the entered values from the homogenous matrix.
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<div> </div>
<div>In general it is very difficult because of angle ambuguities and also because the rotation axis may not be coincident with the cartesian axes to extract these values.</div>
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<div> </div>
<div>Andrew</div>
<div><br><br> </div><br><br>
<div><span class="gmail_quote">On 10/16/06, <b class="gmail_sendername">Michael Rice</b> <<a href="mailto:marice@knology.net">marice@knology.net</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">After looking at the vtkCamera, I see there are methods to adjust the<br>Elevation, Azimuth, Roll, Yaw, and Pitch. These appear to function as
<br>offsets from the current value, but I don't see functions to get<br>these values - other than Roll. Also, there is a SetRoll function to<br>set the absolute roll value, but there aren't functions to set the<br>absolute angles for the other values.
<br><br>I guess I have 2 questions:<br><br>1. Why aren't there functions to get/set the absolute values for<br>elevation, azimuth, yaw, and pitch?<br><br>2. Are there other VTK methods or sample code that returns these values?
<br><br>Thanks.<br>_______________________________________________<br>This is the private VTK discussion list.<br>Please keep messages on-topic. Check the FAQ at: <a href="http://www.vtk.org/Wiki/VTK_FAQ">http://www.vtk.org/Wiki/VTK_FAQ
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<br>Andrew J. P. Maclean<br>Centre for Autonomous Systems<br>The Rose Street Building J04<br>The University of Sydney 2006 NSW<br>AUSTRALIA<br>Ph: +61 2 9351 3283<br>Fax: +61 2 9351 7474<br>URL: <a href="http://www.cas.edu.au/">
http://www.cas.edu.au/</a><br>___________________________________________<br>