[vtkusers] vtkmath

[Harris Scott R CIV AFRL/SNJM]

I'm not familiar with vtkMath, but both of the matrices in your code have a zero determinant; They don't have an inverse.
-Scott Harris

-----Original Message-----
From: kalkie [mailto:jkalkman at HOTMAIL.COM]
Sent: Monday, December 18, 2000 9:19 AM
To: vtkusers at public.kitware.com
Subject: [vtkusers] vtkmath


Dear VTK-users,
 
i'm quite new to vtk. Can anybody help me with the vtkMath method? I want to invert a matrix. In the code as shown below the variable 'answer' has the value zero, so the inverse is not calculated. Probably the M-Time has to be updated, but I don't know how to do that on an object of the vtkMath class.
 
Thanks in advance,
Jeroen Kalkman
 
double **pt, **pt2;
vtkMath* M = vtkMath::New();
 
void main()
{
 pt = new double* [3], pt2 = new double* [3]; 
 for(int q=0; q<3; q++) pt[q] = new double [3], pt2[q] = new double [3];
 pt[0][0]=pt[0][1] = pt[0][2] = 1;
 pt[1][0]=pt[1][1] = pt[1][2] = 2;
 pt[2][0]=pt[2][1] = pt[2][2] = 3;
 pt2[0][0]=pt2[0][1] = pt2[0][2] = 0;
 pt2[1][0]=pt2[1][1] = pt2[1][2] = 0;
 pt2[2][0]=pt2[2][1] = pt2[2][2] = 0;
 answer = M->InvertMatrix(pt,pt2,3);
}

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