CGAL users discussion list

[Sidnei Basei <>]

Hi all,

I'm trying to reconstruct a 3d model from x,y,z cloud points. I used CGAL
Alpha Shape 3 with Delaunay triangulation to reconstruct it.

However, when I draw all triangles in OpenGL, I can see many holes (see
attached image). 

I tried with many alpha options and these holes are still visibles. 

My Code:

Alpha_shape_3 as(points->begin(),points->end(),Alpha_shape_3::NT(MyALPHA),
Alpha_shape_3::REGULARIZED);

Alpha_shape_3::Alpha_shape_facets_iterator
ffi=as.Alpha_shape_facets_begin();
    for( ; ffi!=as.Alpha_shape_facets_end();ffi++) {
        Triangle tr = as.triangle(*ffi);
        out->push_back(tr);
    }

In OpenGL:
for(std::vector<Triangle>::iterator
it=tBuffer->begin();it!=tBuffer->end();it++) {
        Triangle t = (*it);
        glBegin(GL_TRIANGLE_FAN);
        {
            for(unsigned short i=0;i<3;i++) {
                Point p = t.vertex(i);
                double vd[3] =
{(p.x()-center->x()),(p.y()-center->y()),(p.z()-center->z())};
                glNormal3dv(vd);
                glVertex3dv(vd);
            }
        }
        glEnd();
    }

Any Idea??? Thank you a lot.


<http://cgal-discuss.949826.n4.nabble.com/file/n4656638/Screen_Shot_2013-02-01_at_7.38.29_PM.png>
.



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