[vtkusers] Re: Re: Multiple actors with same image

[Roger Blum]

Hi David,

Thanks a lot for your help. I am working on a prototype right now, so
the zoming of the glyphs has to wait till later. It seems to be to 
complicated
for me to do it quickly.

But I am sure I will use it in a couple of weeks for the real thing.

Thanks again,
Roger

"David Gobbi" <dgobbi at atamai.com> schrieb im Newsbeitrag 
news:430DC83F.6050607 at atamai.com...
> Hi Roger,
>
> To zoom the glyphs, you need to add an observer to the
> Renderer's RenderEvent, and each time your observer
> is called, you need to check the renderer's camera,
> figure out how big your glyphs need to be in order for
> them to be visible, and adjust the cube size accordingly.
>
> I'm fairly sure that you can set the orientations of the
> individual glyphs, but I have no experience in actually
> doing this.  Look through the docs and the examples
> and I'm sure something will pop up.
>
> I'll leave the other questions for someone with more
> experience in using glyphs.
>
> - David
>
>
> Roger Blum wrote:
>
>>Hi David,
>>
>>Thanks for showing me an efficient way to do this.
>>I 've also tried vtkGlyph3D, which is exactly what
>>I need.
>>
>>Now of course I have more questions:
>>- Is it possible to only zoom the background?
>>  I have a geographic map as background and
>>  put some objects (at the moment cubes) with
>>  the vtkGlyph3D on it.
>>  If I see the whole map, I cannot see my objects.
>>  I would like to have them fixed in size, so I can see
>>  them at every zoom level.
>>- How can I give my cubes (generated with the
>>   vtkCubeSource) a color?
>>- Can every cube have it's own direction (at the
>>   moment (all cubes have the same)?
>>- How can I select / pick one of those cubes?
>>- If I move the mouse over the scene I would like
>>   to know the current position (world coords).
>>   How can I get those?
>>
>>Thanks again for your (and of course any other) help,
>>Roger
>>
>>"David Gobbi" <dgobbi at atamai.com> schrieb im Newsbeitrag 
>>news:20050824063056.31833.qmail at web88005.mail.re2.yahoo.com...
>>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
>>>
>>>
>>>
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>>
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>>
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>
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