[vtkusers] Strange thing when using vtkStreamLine!!!

[Song Li]

Hi, there,

I got a very strange result when using vtkStreamLine. Suppose I have a
class "mystream" which inherient "vtkStreamLine", and I have set all the
routines about generate a streamline, the following function get a
position as input and update the streamline:

mystream::Update(float x[3])
{
    this->SetStartPosition( x );
    this->Update( );
cout<<"NPts:"<<this->GetStreamers( )->GetNumberOfPoints( )<<endl;
......

I can see a streamline, but the screen output is 1 !!!

And if I use an object of class "mystream" as input of other function,
whenever I use GetStreamers( )->GetStreamPoint(a_number), it will crash.

My codes run well when using VTK3.2, now I am using VTK4.0. Does anybody
know why I can not get the right number of points on the streamline, and
why what I get from the method "GetStreamers( )" is so unstable ?

Thanks a lot!!!!!


--
Song Li
VRAC(Virtual Reality Application Center),Iowa State University
Email: lisong at vrac.iastate.edu
Homepage: http://www.vrac.iastate.edu/~lisong


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