[vtkusers] Multiple actors with same image

[David Gobbi]

Hi Roger,

To do this efficiently, you'll have to use the same
texture for all of the actors.  So forget about
using vtkImageActor or vtkImageMapper, you need to
go one level deeper.

Create a vtkTexture and set its input to your image.
Then use vtkPlaneSource to make a rectangular polydata
that the texture will stick to.

Use the texture and the polydata to create as many
actors as you need.

You should also take a look at vtkGlyph3D.  If you
use glyphs to make the entire collection of little
planes into a single actor, then performance will
skyrocket as compared to having a separate actor
for each little plane.

 - David



--- Roger Blum <roger_blum at swissonline.ch> wrote:

> Hello,
> 
> I would like to display hundreds of image actors
> (bitmaps / symbols) in a 3D 
> scene with Tcl/Tk.
> Every actor has it's own position, but all have the
> same symbol. It should 
> be possible to select/interact with each actor.
> 
> What kind of data source do I choose (vtkPoints,
> vtkPointsSource, 
> vtkBMPReader, ..)?
> Which filters do I have to apply ?
> Do I have to create a vtkImageMapper, and what kind
> of actor do I use then?
> Or can I simply use the vtkImageActor?
> 
> I 'm experimenting with vtkGUI 1.0 which is great
> for this purpose.
> 
> Thanks in advance for your help!
> 
> Roger 
> 
> 
> 
> _______________________________________________
> This is the private VTK discussion list. 
> Please keep messages on-topic. Check the FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>