[vtkusers] How to get the extent points of a render window..??

[rakesh patil]

Hey,

I got it working, thanks a lot.. I used the first solution.. Thanks.. :)


On Wed, Apr 13, 2011 at 9:45 AM, rakesh patil <prakeshofficial at gmail.com>wrote:

> Well,
>
> I don't have any knowledge of any coordinates. Through code, I need to
> compute min_lat, max_lat, min_long, and max_long for a given point.
> I tried getting the viewPort coordinates, but everytime it is showing
> (0,0,1,1). Using this how can I achieve what I want..??
>
> I would also appreciate, if you explain me more on the second option i.e
> TransformMatrix..
>
> Thanks in advance
>
>
> On Wed, Apr 13, 2011 at 3:43 AM, David Gobbi <david.gobbi at gmail.com>wrote:
>
>> Use a view-to-world coordinate transformation.  In view coordinates,
>> the X and Y vary from -1.0 to +1.0 and Z varies from 0.0 to 1.0.
>>
>> One way to do this is with the vtkRenderer::ViewToWorld() function,
>> but I prefer t get the CompositeProjectionTransformMatrix from the
>> camera, invert it, and then use it directly as a 4x4 transformation
>> matrix between view coords and world coords.
>>
>>  - David
>>
>>
>> On Tue, Apr 12, 2011 at 4:01 PM, rakesh patil <prakeshofficial at gmail.com>
>> wrote:
>> > Hello Users,
>> >
>> > How can I get the extents coordinates of a render window? I mean,
>> suppose a
>> > grid is displayed on a render window, and I want to know min_lat,
>> max_lat,
>> > min_lon, max_lon for that entire scene. I dont want the min/max
>> lat/lons, of
>> > the grid, but the extreme coordinate points of the render window?
>> >
>> > Is it possible in VTK?
>> >
>> > Thanks in advance
>> >
>> > Regards
>> > Rakesh Patil
>>
>
>
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