[vtkusers] vtkGlyph3D problem?

[Bill Chivas]

Many thanks Eric for your advice and your solution!

Regards,
Thanos

2010/4/13 Eric E. Monson <emonson at cs.duke.edu>

> Hey Bill,
>
> That is one situation where using the vtkGlyphSource2D with
> SetGlyphTypeToVertex() as the Source to your current vtkGlyph3D might work
> out well. Each vertex is really only one point, which is good for memory and
> for rendering speed.
>
> There is also some code in the ParaView repository for doing Point Sprites,
> but it's not something that's in the straight VTK collection.
>
> If the memory problem is stemming from not just the number of points, but
> the number of scalars/vectors/tensors which are getting copied to each
> point, too, then it might be worth copying only the needed attributes to the
> data which will be glyphed with so many points.
>
> Just as a side note, ParaView (www.paraview.org), which is built on top of
> VTK, works well for me when I'm trying to figure out how to build up my
> visualization. It doesn't have everything that's in VTK, but a lot of the
> parts are there, and it's a little easier sometimes to just play with
> combinations of representations to see what's possible or what looks good.
>
> Talk to you later,
> -Eric
>
>
> On Apr 13, 2010, at 4:50 AM, Bill Chivas wrote:
>
> Hi Jerome,
>
> good argument!
> I use glyph mechanism in order to represent the points on the grid. Can you
> think of other way to do that?
> Again, it seems to me impossible that there is no way with vtk to visualize
> the points and the grid at the same time!
>
> Bill
>
> 2010/4/13 Jérôme <jerome.velut at gmail.com>
>
>> Hi,
>> The "not able to allocate..." message is the usual one when you don't have
>> enough memory.
>> Don't forget that your sphere will be copied at each input point. Thus the
>> final number of
>> points will be:
>>    number_of_sphere_points * number_of_input_points
>>
>> eg. 20x20 spheres = 400 points * 75k = 30M
>>
>> each input point data is copied over each sphere point. It multiplies the
>> amount of needed
>> memory as well (fo instance, a tensor multiplies by 9, if it's double data
>> it is 4 octets
>> more, etc.)
>>
>> HTH
>> Jerome
>>
>>
>> 2010/4/13 Sebastian Gatzka <sebastian.gatzka at stud.tu-darmstadt.de>
>>
>>>  I'm experiencing the same problem!
>>>
>>> Any ideas? Lack of memory?
>>>
>>> Am 13.04.2010 10:27, schrieb Bill Chivas:
>>>
>>> Hi all,
>>>
>>> i use vtkGlyph3D with source a vtkSphereSource and input a
>>> vtkunstructuredgrid.
>>> Grids with small number of vertices (approximately <10K ) are glyphed ok.
>>> But large grids (e.g. vertices==75K) are not glyphed! A vtk message
>>> appears saying "not able to allocate...something" (i can't read the whole).
>>>
>>> What is the problem? Large grids with many vertices can't be glyphed?
>>>
>>> Bill
>>>
>>>
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