[vtkusers] XYZ to RST coords

[John Platt]

Hi Jonathan,

 

The parametric coordinates (r,s,t) used in VTK cells are defined in the
range (0,1). I am not sure what you mean by true RST coordinates but
they can be transformed to (-1,1) by ( -1 + 2*r ).

 

Have you looked at EvaluatePosition() for (x,y,z) to (r,s,t)?

 

HTH

 

John.

 

-----Original Message-----
From: vtkusers-bounces+jcplatt=lineone.net at vtk.org
[mailto:vtkusers-bounces+jcplatt=lineone.net at vtk.org] On Behalf Of
jonathan grimm
Sent: 18 January 2006 19:58
To: vtkusers at vtk.org
Subject: [vtkusers] XYZ to RST coords

 

Is there a way to convert the parametric coordinates from vtkCell to
true RST coordinates?
Is there a different way to do XYZ -> RST in vtk.

My cells are vtkQuadraticHexahedrons.  I am using vtk4.4, but
vtkQuadratic Hexadron has a patch from the CVS.

-- 
Sometimes it's hard to tell the dancer from the dance - Corwin in CoC 

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