[vtkusers] intersection between the polydata and volume

[Jothybasu Selvaraj]

I would suggest a different approach (much faster than the one you use now).

Use vtkPolydataToImageStencil to create a ImageStencil of your vtkPolydata
,then set it's output to vtkImageStencil. In vtkImageStencil
ReverseStencilOff/On depending on what you want (inside of polydat or
outside) then Setbackground to 0. Now you have a binarized volume.  Now
using pointers you could rapidly find out whether a given point/ voxel is
inside or outside. (bool values different for in or out on
ReverseStencilOff/ON).

Jothy

On Thu, Apr 5, 2012 at 10:13 AM, qwcbeyond <340181048 at qq.com> wrote:

> Hi,Bill. Thanks for your response. I tried your method to determine whether
> the voxels in the polydata, but the only problem is  it's too  slow. I use
> the  volume data(512*512*2)  to test this method, it takes several minutes.
> If I use the 512*512*365 volume data,it will take me a long time.
>
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-- 
Jothy
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