[vtkusers] lens distortion simulation

[Frederic Danesi]

A simple way to get a fisheye view could be to use a standard projection,
save the image (maybe using offscreen rendering) and use it as a texture to
be mapped on a adequate fisheye geometry ... ? 
This could do the trick, even if it will generate some latency time.

To be discussed ...
Fred.

Cordialement,
F.Danesi
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-----Message d'origine-----
De : vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] De la part
de Francois Bertel
Envoyé : vendredi 27 mars 2009 18:47
À : vtkusers at vtk.org
Objet : Re: [vtkusers] lens distortion simulation

The only way I can think of to distort the image in VTK is to to set
the ViewAngle of the camera (expressed in degrees) to a large value
like 100 (the initial value is 30)
and make the distance from the camera to the object to be distorted
really small.

It is not lens distortion though, it is just perspective distortion.
And it is not real fish-eye lens projection either because the
projection happens on a plane not on a spherical shape.

On Fri, Mar 27, 2009 at 1:10 PM, nugg <jsantam.hm at hotmail.com> wrote:
>
> Hi Giancarlo,
>
>  It is a good question (your second point about modeling lens distortion).
> I would
> also be grateful with any VTK user how achieved such a challenging
feature.
>
> Regards.
>
>
> Giancarlo Amati wrote:
>>
>>
>> Good morning everybody,
>>
>> I'm developing a software for the simulation of an endoscopy, I have two
>> questions:
>>
>> 1) I need to put a mask which is black everywhere but in the center for a
>> radious of about 500 pixels....through which I want to see my 3D model
>> behind.
>> 2) More important: is there any class in VTk which allows to apply some
>> distortion factors to the camera lens and see the 3D model distorted?
>>
>> Kind regards.
>> Giancarlo
>>
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