[vtkusers] RE Boolean Operation on two (cube) objects

Fri Apr 9 07:32:11 EDT 2010

Hey Bryn.

This sounds really good!
Unfortunately I'm not familiar with GTS so far!

What do I have to do to make your code (vtkSurfaceBooleanOperations) work?
Do i have to compile GTS?

And than how do I specify the operations I want?
(Difference, Union, Intersection)
This isn't clear to me after a first quick look into the code.

Hope to hear from you - this topic is very crucial to me.
Sebastian

Am 09.04.2010 08:20, schrieb Bryn Lloyd:
> Hi,
>
> 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.
>
> http://old.nabble.com/boolean-operations-td25491156.html
>
> Basically, you can convert the polydata to a gts surface and then 
> perform boolean operations.
>
>
> I did this previously. Here is the code (and the xml files to create a 
> paraview plugin):
>
> http://www.vision.ee.ethz.ch/~blloyd/vtkSurfaceBooleanOperations/
>
>
> Cheers
> Bryn
>
>
>
>
>
>
> Stephane PLOIX wrote:
>>
>> Hi Sebastian,
>>
>> VTK is not a CAD tool, so you may not find exactly what you need.
>>
>> The clip operation is made cell by cell.
>> If you have a box as input, then you have 6 cells which are the 6 
>> faces of your cube.
>> I think what you are looking for is an hexaedron, which is one 
>> volumic cubic cell.
>>
>> 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.
>> The distance field to a cube is higly non-linear, so there is no 
>> chance that you will get what you are looking for.
>>
>> Now you have two solutions :
>> 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.
>> 2/ implementing a non-linear clipping operation inside the cells.
>>
>> While the second solution would be a great addition to VTK, it is 
>> also very difficult to implement...
>>
>> Best,
>> Stephane
>>
>>
>>
>> *sebastian.gatzka at stud.tu-darmstadt.de*
>> Envoyé par : vtkusers-bounces at vtk.org
>>
>> 08/04/2010 11:26
>>
>>
>> A
>>     vtkusers at vtk.org
>> cc
>>
>> Objet
>>     [vtkusers] Boolean Operation on two (cube) objects
>>
>>
>>
>>
>>
>>
>>
>>
>> Hello World.
>>
>> I have finally manged to clip one cube with another.
>> The result is not what I have expected.
>> The intersecting cube clips one edge-point of the first cube and with 
>> it all the attached faces.
>> Look at the attached image to see how this looks like.
>>
>> What I really wanted to realize was that the intersection is cut out 
>> and not to delete the whole sides.
>> It's hard to explain but a boolean operation like "substract" may 
>> descibe it the best - like the picture* boolean.png* in the attachement!
>>
>> See you. Sebastian_______________________________________________
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