[vtkusers] How to generate a surface normal glyph for a triangle cell

[Miguel Angel Rodriguez Florido]

	Hi Elvis,

	Perhaps, thanks to Xenophon Papademetris, this link could be useful for 
you:

http://www.bioimagesuite.org/vtkbook/xpvtkbook.pdf

	Hth.

Elvis Dowson wrote:
> Hi,
>         The solution to this problem is to use the Tcl eval command, as 
> follows
> 
> eval arrowGlyphPoints InsertNextPoint [planeSource GetNormal]
> 
> This will expand the pointer to the normal co-ordinates, to a list, so 
> that InsertNextPoint will get the x, y and z coordinate inputs.
> 
> Other alternative solutions to this problem can be found here: Nabble - 
> VTK - Users - simple question about Tcl and VTK 
> <http://www.nabble.com/simple-question-about-Tcl-and-VTK-ts6746384.html%23a6746384>
> 
> Ok, so I got that fixed, but now I have a problem that I cannot explain. 
> The output of the program is still wrong. The surface normal vector 
> should be pointing perpendicular to the plane surface 
> 
> How can I fix this? The arrow should be pointing upwards, from the plane 
> surface. 
> 
> Note that at some point, I decided to simplify the problem using a plane 
> surface, try to solve the display of the surface normal first, before 
> progressing on to display the surface normal glyph for a triangle cell.
> 
> 
> Best regards,
> 
> Elvis Dowson
> 
> On Oct 8, 2008, at 11:02 AM, Elvis Dowson wrote:
> 
>> Hi,
>>         I'm just trying to breakdown the problem. I'm just stuck at 
>> one point below. Could someone help? 
>>
>> arrowGlyphPoints InsertNextPoint [planeSource GetNormal]
>>
>> I have a plane source and I want to pass the plane normal to an arrow 
>> glyph. I'm using vtkPoints to represent the location of the arrow 
>> glyph. I can't seem to get the correct data type to be passed from 
>> vtkPlanceSource::GetNormal() to vtkPoints::InsertNextPoint() in TCL. I 
>> get the error message, Object named: arrowGlyphPoints, could not find 
>> requested method: InsertNextPoint
>> or the method was called with incorrect arguments.
>>
>> How can I fix the call to the above method in TCL?
>>
>> Here are the method declarations. 
>>
>> vtkPoints::InsertPoints(const double x[3]) 
>>
>> virtual double* vtkPlaneSource::GetNormal()
>> virtual void vtkPlaneSource::GetNormal(double data[3]) 
>>
>> Question: How can I pass data[3] or double * returned by 
>> vtkPlaneSource::GetNormal() into vtkPoints::InsertNextPoint() ? 
>>
>> Best regards,
>>
>> Elvis Dowson
>>
>>
> 
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-- 
Miguel Angel Rodríguez Florido
Departamento de Ingeniería del Software
División de Investigación y Desarrollo Tecnológico
INSTITUTO TECNOLOGICO DE CANARIAS, S.A. - GOBIERNO DE CANARIAS
URL: www.itccanarias.org Tlfno: +34 928 727548, Fax: +34 928 727517

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