[vtkusers] Want to do 3DOF orientation with vtkGlyph3D

[David Gobbi]

There is also a class called vtkTensorGlyph you might want to look at.

 - David


On Wed, Mar 23, 2011 at 2:32 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> Hi Chris,
>
> I can think of a couple ways that the glyph mapper could be changed to
> achieve this.
>
> The best, I think, is to allow the orientation array to have more
> than three parameters.  So if you use SetOrientationArray() to specify
> an array with:
> 9 parameters - interpret as a tensor and do an affine transformation
> 4 parameters - interpret as a quaternion and do a 3DOF orientation
> 3 parameters - use the current behaviour
>
> Another way would be to allow more orientation arrays to be set,
> i.e. add a SetOrientation2Array() method, where by default this
> second orientation array would be the NORMALS array.  It would
> be hard to make this backwards-compatible, though.
>
> These are all just hypothetical.
>
>  - David
>
>
> On Wed, Mar 23, 2011 at 2:08 PM, Chris Volpe ARA/SED <cvolpe at ara.com> wrote:
>> It appears that vtkGlyph3D allows one to orient glyphs that have (nominal,
>> at least) symmetry around one axis, such as vtkCone. What if I want to apply
>> a full 3DOF orientation matrix for each glyph at each point? I realize that
>> specifying both a position and orientation at each occurrence of a glyph can
>> be achieved by using a separate actor for each one, but last time I
>> encountered this situation, VTK incurred a substantial performance penalty
>> when using a large number of actors. And since I don’t need any of the other
>> features of multiple actors (e.g. separate material properties), I’d like to
>> avoid doing so if there’s a practical alternative. Any suggestions?
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Chris
>>
>> --
>> Christopher R. Volpe,
>> Ph.D.                                                           Email:
>> cvolpe at ara.com
>>
>> Senior Scientist, Information Exploitation Systems             Main Desk:
>> 919-582-3300
>>
>> Applied Research Associates,
>> Inc                                                     Direct: 919-582-3380
>>
>> 8537 Six Forks Rd., Suite
>> 6000                                                            Fax :
>> 919-582-3301
>>
>> Raleigh, NC 27615                                         Web:
>> http://www.ara.com/offices/NC.htm
>