<font size="2"><font face="verdana,sans-serif">Hundred independent actors is quite normal, the performance problems start occurring with many thousands of actors.<br></font></font><div><font class="Apple-style-span" face="verdana, sans-serif"><br>
</font></div><div><font class="Apple-style-span" face="verdana, sans-serif">You don't have to remove actors, you can turn off  their visibility<br></font></div><div><div class="gmail_quote">actor->SetVisibility(0);</div>
<div class="gmail_quote"><br></div><div class="gmail_quote">On Wed, Aug 24, 2011 at 04:04, Florian Bruckner <span dir="ltr"><<a href="mailto:e0425375@gmail.com">e0425375@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
ok, but can you tell which one of the 2 designs is more efficient for<br>
some cases:<br>
<br>
In my case i have multiple files that should be displayed at once (say<br>
max. 16. If I have time-series then there will always be max.16 files<br>
at a time). These files contain an unstructured grid as well as some<br>
vector / scalar data. Mainly I want to be able to display the grid and<br>
then toggle the vectordata (glyph) on and off. The scalar data should<br>
only change the color. So my intention was to create one mapper/actor<br>
for the structure and one mapper/actor for the glyph per file.<br>
Switching glyph on and off is then done by simple adding / removing<br>
the mapper to the proper renderer (there could be more than one if<br>
some files should be displayed next to each other). so this<br>
approximately would give 2*16 actors which are active at a time. do<br>
you think this could be a performance problem?<br>
<br>
if i would use this combine-filter i cannot control the color settings<br>
of structure and glyph seperately, right? because then this method is<br>
no option for me. E.g. I would like display the geometry with opacity<br>
and gray color if the glyph is switched on.<br>
<br>
thanks Alex for your fast reply<br>
FloB<br>
<div><div></div><div class="h5"><br>
<br>
On Wed, Aug 24, 2011 at 1:43 AM, Alex Malyushytskyy<br>
<<a href="mailto:alexmalvtk@gmail.com">alexmalvtk@gmail.com</a>> wrote:<br>
> First, there are a multiple ways you can do things in vtk.<br>
><br>
> Using multiple actors make sense only if you need an ability easy<br>
> separate object from other objects and might be not efficient<br>
> if you have large number of objects ( if your data has more than few<br>
> hundred objects (pieces/files,) I will avoid using one actor per<br>
> object.<br>
><br>
> You also probably don't need multiple renderers.<br>
><br>
> In my practice mostly often I used 2 designs:<br>
><br>
> 1. Â per file: Reader -> filter -> actor<br>
> One window and one renderer per application<br>
><br>
> 2 Â per file: Reader -> filter -><br>
><br>
> every filter(s) output goes to combining filter as an input (for<br>
> example vtkAppendPolyData)<br>
><br>
> combining filter-> actor -><br>
> still one  window and one renderer per application<br>
><br>
><br>
><br>
><br>
><br>
> On Tue, Aug 23, 2011 at 3:26 AM, Florian Bruckner <<a href="mailto:e0425375@gmail.com">e0425375@gmail.com</a>> wrote:<br>
>> hi, i'm new to vtk and i have a few design questions. I want to write a<br>
>> simple visualization tool for our data. It should support multiple input<br>
>> files and different filters for each input file. Each filter then needs<br>
>> a mapper and an actor, if I understand that correctly. All those things<br>
>> should be put into an new class asdf_input.<br>
>><br>
>> Finally there is an renderer window where the data should be displayed.<br>
>> So I would add the proper actors from the asdf_input object and add them<br>
>> to multiple renderers. Then these multiple renderers are added to the<br>
>> renderer window. All these things are put into another class<br>
>> asdf_output.<br>
>><br>
>> So this is the first plan. But after looking over the vtk class<br>
>> reference i found vtkView, vtkDataRepresentation, ... and i was<br>
>> wondering whether there is already something very similar available.<br>
>><br>
>> So my question is whether there is already some top-level class<br>
>> available, which allows to simplify the handling of multiple<br>
>> input/filters/renderers.<br>
>><br>
>> greetings<br>
>> Florian<br>
>><br>
>><br>
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</div></div></blockquote></div><br></div>