[vtkusers] mesh properties from a camera view

[David E DeMarle]

Visible surface selection is pixel based and can not pick more than one
cell/point per pixel.

Frustum selection is geometry based and will pick all points/cells behind
the screen region regardless of view resolution, but it can not determine
what cells/points are visible and what are not.




David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Aug 13, 2013 at 2:40 PM, marco <piccima at gmail.com> wrote:

> Hi David,
> Thank you for your help.
> I have some strange behavior of the selection.
> If I use a large mesh:
> 55280 points.
> 13820 cells.
> hitting the s button gives me:
> Selection has 289 nodes.
> There are 0 points in the selection.
> There are 0 cells in the selection.
> and not selected part is red.......
> But if I zoom and enlarge the window I get:
> Selection has 1 nodes.
> There are 764 points in the selection.
> There are 191 cells in the selection.
>
> It happens the same if I zoom out the sphere
> What is happening?
>
>
> On 08/13/2013 07:12 AM, David Doria wrote:
>
>> On Mon, Aug 12, 2013 at 11:45 PM, marco <piccima at gmail.com> wrote:
>>
>>> Thank you very much David,
>>> this is a good example, I need to study it , but I think I can make it
>>> work for my needs.
>>>
>>> In this example has been used the vtkInteractorStyleTrackballCam**
>>> eraMarco,
>>> can I use just the camera position and the object position?
>>>
>>> Marco
>>>
>> You just have to pass the vtkHardwareSelector the renderer - the
>> interactor style is just used to trigger the event to happen when the
>> 's' key is pressed. You can trigger it however you want.
>>
>> David
>>
>>
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