[vtkusers] Mixing images with 3D geometry

[Chris Volpe ARA/SED]

Actually, nevermind. I found vtkImageResample, but there's a better way. I can use the ImageMapper's RenderToRectangle capability to render to a specified portion of the viewport or window. It does the resizing automatically.

Thanks again for your help.

-Chris


> -----Original Message-----
> From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On
> Behalf Of Chris Volpe ARA/SED
> Sent: Friday, July 01, 2011 5:47 PM
> To: David Gobbi
> Cc: vtkusers
> Subject: Re: [vtkusers] Mixing images with 3D geometry
> 
> Hi David-
> 
> Repositioning the actor seems fairly straightforward, but is there a
> image resize filter, or do I need to use something more generic like a
> vtkProbeFilter?
> 
> thanks,
> 
> -Chris
> 
> 
> > -----Original Message-----
> > From: David Gobbi [mailto:david.gobbi at gmail.com]
> > Sent: Friday, July 01, 2011 11:12 AM
> > To: Chris Volpe ARA/SED
> > Cc: vtkusers
> > Subject: Re: [vtkusers] Mixing images with 3D geometry
> >
> > Hi Chris,
> >
> > The way to do this is with vtkActor2D and vtkImageMapper.  Since
> > vtkImageMapper uses display coordinates, you will have to resample
> > the image to the correct size and repositiion the actor every time
> the
> > window size changes.
> >
> >  - David
> >
> > On Fri, Jul 1, 2011 at 7:27 AM, Chris Volpe ARA/SED <cvolpe at ara.com>
> > wrote:
> > > This seems like it should be an easy thing to do, but none of the
> > > documentation or examples I've seen seem to do what I want. I would
> > like to
> > > draw 3D geometry on top of a 2D background image. I want the image
> to
> > > subtend a fixed angular extent, e.g. if the camera FOV is 30deg,
> and
> > I
> > > define the image as 30deg, I want it to fill the vertical extent of
> > the
> > > render window (assuming the camera is not set to Use Horizontal
> View
> > Angle)
> > > . I want *all* 3D geometry also in the scene to be drawn on top of
> > the image
> > > - i.e. the image shouldn't have a "position" which would allow it
> to
> > obscure
> > > the 3D geometry. When I change the camera pose, I want to provide a
> > new
> > > image, but I don't want the image to be viewed at an oblique angle
> -
> > I want
> > > it to be centered facing the camera again. vtkImageActor just maps
> an
> > image
> > > onto a planar surface sitting out in space and doesn't maintain its
> > place
> > > and orientation  in the render window. Basically, I want the
> > functionality
> > > of vtkFollower, but in addition to automatically correcting its
> > orientation
> > > so that it always faces the camera, I want it to automatically
> > correct its
> > > position so that it's always in the center of the field of view and
> > always
> > > at the right distance. Does this functionality exist anywhere or do
> I
> > need
> > > to jump through some hoops in my render loop to achieve this?
> > >
> > >
> > >
> > > Thanks,
> > >
> > >
> > >
> > > Chris
> > >
> > > --
> > > Christopher R. Volpe,
> > > Ph.D.
> > Email:
> > > cvolpe at ara.com
> > >
> > > Senior Scientist, Information Exploitation Systems             Main
> > Desk:
> > > 919-582-3300
> > >
> > > Applied Research Associates,
> > > Inc                                                     Direct:
> 919-
> > 582-3380
> > >
> > > 8537 Six Forks Rd., Suite
> > > 6000
> Fax :
> > > 919-582-3301
> > >
> > > Raleigh, NC 27615                                         Web:
> > > http://www.ara.com/offices/NC.htm
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