[vtkusers] OpenGL rendering of marchingCubes filtered volume

[giuseppe.tommasone at tiscali.it]

I solved my recent problem with getting a volume contour vertices (see 
my earlier messages) thanks to help from this mailing list, but i still 
can't do what i really wanted to: when i filter 
vtkStructuredPointsReader's output with a vtkMarchingCubes filter, the 
output is rendered the right way by the vtk renderer, but when i do the 
following:

//Store all the points in a vector
fillVector(&pointsVector, marchingCubes->GetOutput()->GetPoints());

void display() {
    glBegin(GL_TRIANGLES);
    for(iterator it = pointsVector.begin(); it != pointsVector.end(); 
it++) {
        glVertex3f(/*points coordinates*/);
    }
    glEnd();
}

the result isn't by far the same, even with backface removal and 
lighting enabled, even though if i render the points as GL_POINTS i can 
see that the vertices are right...it looks like if the vertices are 
shuffled up and thus sequentially rendering them as triangles mixes up 
the lines...i tried sorting the vector, but it had no effect...so the 
question is: in which order are the vertices stored in GetPoints(), and 
how can i render them via OpenGL?

Thanks in advance

Mattia Tommasone


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