[vtkusers] vtkPlaneSource, orientation, position w/ SetCenter & SetNormal

[Tim Ricard]

 Hello again users,
 
 As I explained yesterday (below) I am having some problems defining a plane sources location. Should/would the following work? (note Vec3f is a vector class that supports the standard operators, ie +, *, etc...)
 
    Vec3f pn(-1., 0., 1.); // normal not used
    Vec3f pp(3., .0, -3.); // origin
    //Vec3f pp(0., .0, 0.); // origin
    Vec3f pu(-1.,0., -1.); // point 1 on plane, local to 0
    Vec3f pv(0.,1.,0.); // point 2 on plane.
    float lu = 200, lv = 150;
 
    Vec3f p1(pp + (lu/2.)*pu); 
    Vec3f p2(pp + (lv/2.)*pv);
 
    plane->SetOrigin(pp[0], pp[1], pp[2]);
    plane->SetPoint1(pu[0], pu[1], pu[2]);
    plane->SetPoint2(pv[0], pv[1], pv[2]);
 
 This works fine with the origin is 0, 0, 0 
 But not when I change the origin to something else the plane is skewed.  I would think that point 1 and 2 would be defined such that (p1-origin) x (p2-origin) would produce the palnes normal... that probably is the case I imagine, what am I doing wrong?

 Thanks for your time.
 -tim
 
Note: forwarded message attached.

		
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