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

[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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-- 
-------------------------------------------------
Bryn Lloyd
Computer Vision Laboratory
ETH Zürich, Sternwartstrasse 7, ETF C110
CH - 8092 Zürich, Switzerland
Tel: +41 44 63 26668
Fax: +41 44 63 21199
-------------------------------------------------