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<font size="-1"><font face="Helvetica, Arial, sans-serif">Hey Bryn.<br>
<br>
This sounds really good!<br>
Unfortunately I'm not familiar with GTS so far!<br>
<br>
What do I have to do to make your code (vtkSurfaceBooleanOperations)
work?<br>
Do i have to compile GTS?<br>
<br>
And than how do I specify the operations I want?<br>
(Difference, Union, Intersection)<br>
This isn't clear to me after a first quick look into the code.<br>
<br>
Hope to hear from you - this topic is very crucial to me.<br>
Sebastian<br>
<br>
</font></font><br>
Am 09.04.2010 08:20, schrieb Bryn Lloyd:
<blockquote cite="mid:4BBEC729.5020202@vision.ee.ethz.ch" type="cite">Hi,
<br>
<br>
I have not been following this thread, but it seems to me that a
similar problem was discussed a while ago, with a solution using the
GTS library.
<br>
<br>
<a class="moz-txt-link-freetext" href="http://old.nabble.com/boolean-operations-td25491156.html">http://old.nabble.com/boolean-operations-td25491156.html</a>
<br>
<br>
Basically, you can convert the polydata to a gts surface and then
perform boolean operations.
<br>
<br>
<br>
I did this previously. Here is the code (and the xml files to create a
paraview plugin):
<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.vision.ee.ethz.ch/~blloyd/vtkSurfaceBooleanOperations/">http://www.vision.ee.ethz.ch/~blloyd/vtkSurfaceBooleanOperations/</a>
<br>
<br>
<br>
Cheers
<br>
Bryn
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Stephane PLOIX wrote:
<br>
<blockquote type="cite"><br>
Hi Sebastian,
<br>
<br>
VTK is not a CAD tool, so you may not find exactly what you need.
<br>
<br>
The clip operation is made cell by cell.
<br>
If you have a box as input, then you have 6 cells which are the 6 faces
of your cube.
<br>
I think what you are looking for is an hexaedron, which is one volumic
cubic cell.
<br>
<br>
After that, during the clip operation, the cell(s) are clipped by the
0-level set of the field you set as input, the values being linearly
interpolated between the vertices inside the cell.
<br>
The distance field to a cube is higly non-linear, so there is no chance
that you will get what you are looking for.
<br>
<br>
Now you have two solutions :
<br>
1/ dividing your input in smaller cells so that the non-linear nature
of your clip function is not too far from the linearly interpolated
one.
<br>
2/ implementing a non-linear clipping operation inside the cells.
<br>
<br>
While the second solution would be a great addition to VTK, it is also
very difficult to implement...
<br>
<br>
Best,
<br>
Stephane
<br>
<br>
<br>
<br>
*sebastian.gatzka@stud.tu-darmstadt.de*
<br>
Envoyé par : <a class="moz-txt-link-abbreviated" href="mailto:vtkusers-bounces@vtk.org">vtkusers-bounces@vtk.org</a>
<br>
<br>
08/04/2010 11:26
<br>
<br>
<br>
A
<br>
<a class="moz-txt-link-abbreviated" href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a>
<br>
cc
<br>
<br>
Objet
<br>
[vtkusers] Boolean Operation on two (cube) objects
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Hello World.
<br>
<br>
I have finally manged to clip one cube with another.
<br>
The result is not what I have expected.
<br>
The intersecting cube clips one edge-point of the first cube and with
it all the attached faces.
<br>
Look at the attached image to see how this looks like.
<br>
<br>
What I really wanted to realize was that the intersection is cut out
and not to delete the whole sides.
<br>
It's hard to explain but a boolean operation like "substract" may
descibe it the best - like the picture* boolean.png* in the
attachement!
<br>
<br>
See you. Sebastian_______________________________________________
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