[vtkusers] Rendering speed when using text labels

[David Goldsmith]

Thanks for your reply, Berk.  We've thought of that -- you're quite 
right that 1000 labels is pretty useless. However, we need an efficient 
way to turn the labels on and off for our use.  For example, we may have 
10,000 points, each with one or more value(s) associated with it.  Our 
users want to see these values without having to select the points or 
triangles (in our application, that's gonna get awfully tedious).  When 
all 10,000 points are visible, they're so close together that there is 
no point, but when the user zooms in to get a closer view, and can see 
perhaps 100 points, we'd like the numbers to show up next to the points 
automatically.  How might one accomplish that?  Thanks again!

DG

Berk Geveci wrote:
> In paraview, we decided to only show labels of selected cells/points
> to overcome this issue. I don't think showing more than a few dozen
> labels makes much sense anyway.
>
> -berk
>
> On 8/24/07, David Goldsmith <David.L.Goldsmith at noaa.gov> wrote:
>   
>> Hello!  We're using vtk for 3-D traingular mesh visualization.  To
>> number label the points in the visualization, we're using
>> vtkLabeledDataMapper.  We're finding, however, that labeling even on the
>> order of only 1000 points significantly slows down all rendering.  Any
>> suggestions for how to speed things up would be greatly appreciated.
>> Thanks!
>>
>> DG
>>
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