<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
And yet another mail. While I changed code to use the Eigen vectors
and matrices, I determined two things to look out for.<br>
<br>
1. In contrast to the old vector and matrix types, the Eigen types
are not initialized. So if you need them to be initialized, you have
to call setZero()<br>
<br>
2. The resize of a Eigen vector seems to destroy any values stored
in it.<br>
<br>
from the Eigen documentation: "If the current number of coefficients
of <code>*this</code> exactly matches the product <em>rows</em> *
<em>cols</em>, then no memory allocation is performed and the
current values are left unchanged. In all other cases, including
shrinking, the data is reallocated and all previous values are
lost."<br>
<br>
Am 07.04.2011 12:18, schrieb Sebastian Eichelbaum:
<blockquote
cite="mid:20110407101833.GE9731@cardano.informatik.uni-leipzig.de"
type="cite">
<pre wrap="">And another mail:
- Eigen Matrices are Column Major by default. The old WMatrix was Row-Major. This means, if you use the operator( size_t, size_t ), the first argument is still the row. But if you use operator[], you need to transpose your indexing. Btw. do not use operator[]! This makes your code hard to understand.
- Self-assignment;
* m = m*m works
* v = m*v works
* v = v.dot() does not!
-> use v.dotInPlace() instead
* generally: if you do not use standard operators but special member functions, use the InPlace version instead of self-assignment.
Bye
On Thu, 07 Apr 2011, Sebastian Eichelbaum wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi
Most of the module have an "owner". Those who don't will be fixed by me or someone else. One of these candidates might be Marching Cubes. Another "problem" is the nav slices module. I'll write a completely new one. This is especially important for the color-mapping.
One hint for all:
* the WVector3D_2 can't be casted to an osg::Vec3!
* use toOsgVec3f in WVector.h
* We did NOT (and you should'nt either) provide a copy constructor to WVector3D which allows this since an automatic replace of WVector3D with WVector3d_2 would break this.
Another thing:
* If you need to change an API in common for example which uses WVector3D
-> will break other modules and API
-> possible work-around: use the conversion methods in WVector3D to provide the same method with the other, new WVector3D_2 and mark the old function deprecated.
ALL methods/classes marked deprecated will be removed by me afterwards. So please use it extensively!
Bye
Sebastian
On Thu, 07 Apr 2011, Alexander Wiebel wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi Sebastian,
</pre>
<blockquote type="cite">
<pre wrap="">* Check your modules
</pre>
</blockquote>
<pre wrap="">What do you mean by "your modules". I had worked on/with many
modules but I would regard only a few to be "my own". What happens
with modules noone thinks they are "there own"? Will they be broken,
deactivated or is there any other idea how to handle them? This
question also applies to the color mapping change.
Cheers,
Alex
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">_______________________________________________
OpenWalnut-Dev mailing list
<a class="moz-txt-link-abbreviated" href="mailto:OpenWalnut-Dev@lists.informatik.uni-leipzig.de">OpenWalnut-Dev@lists.informatik.uni-leipzig.de</a>
<a class="moz-txt-link-freetext" href="http://lists.informatik.uni-leipzig.de/mailman/listinfo/openwalnut-dev">http://lists.informatik.uni-leipzig.de/mailman/listinfo/openwalnut-dev</a>
</pre>
</blockquote>
<pre wrap="">
--
Dipl.-Inf. Sebastian Eichelbaum
Universität Leipzig
Institut für Informatik
Abteilung Bild- und Signalverarbeitung
PF 100920
D-04009 Leipzig
_______________________________________________
OpenWalnut-Dev mailing list
<a class="moz-txt-link-abbreviated" href="mailto:OpenWalnut-Dev@lists.informatik.uni-leipzig.de">OpenWalnut-Dev@lists.informatik.uni-leipzig.de</a>
<a class="moz-txt-link-freetext" href="http://lists.informatik.uni-leipzig.de/mailman/listinfo/openwalnut-dev">http://lists.informatik.uni-leipzig.de/mailman/listinfo/openwalnut-dev</a>
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
<br>
</body>
</html>