Question

先生，请问您能告诉我如何更正此代码我的想法是消除我的领域中的交叉点，因为它使我的身材不清楚这是我的代码的一方这就是我保存坐标的方式

int nombre=0;

for (int i = 0; i < size; i++)
{
    Sphere *s = &sphereTree.nodes.index(sphNum);//this is a sphere

    Point rt(s->c.x, s->c.y, s->c.z);//this is the center
    Vpoint.push_back(rt);//I saved centers here
    Vrayon.push_back(s->r);//I saved  radiu of spheres
    std::vector<Point> pp;
    pp=triangulateSphere(rt, s->r);//the points of sphere (rt,s->r)

    for (int indice=0;indice<pp.size();indice++)
    { 
        Point p1=pp[indice];
        tableau2[i].push_back(p1);//I saved points of sphere i in //tableau2[i];
    }

    nombre++;
}

然后只获得未包含在其他领域的点数，我确实喜欢这个

glBegin(GL_TRIANGLE_STRIP);
for(int indsphere=0; indsphere<=nombre;indsphere++)// the spheres indexes
{
    for (int indautresphere = 0;indautresphere<=nombre;indautresphere++)//other spheres created
    {
        if(indsphere!=indautresphere)
        {
            for (int nbrpointsi=0;nbrpointsi<tableau2[indsphere].size();nbrpointsi++)
            {
                float v1=(tableau2[indsphere][nbrpointsi].x)-(Vpoint[indautresphere].x);
                float v2=(tableau2[indsphere][nbrpointsi].y)-(Vpoint[indautresphere].y);
                float v3=(tableau2[indsphere][nbrpointsi].z)-(Vpoint[indautresphere].z);
                float val=sqrt(v1*v1+v2*v2+v3*v3);//calculate distance between points

                if(val >= (Vrayon[indautresphere]))
                    glVertex3fv(&((tableau2[indsphere][nbrpointsi]).x));
            }
        }
    }
}

glEnd();

这没有编译错误，但它显示了所有点，即使是那些与其他球体相交的点。它没有消除任何一点

Answer 1

如果该点位于任何其他球体之外，您当前会添加顶点...

以下可能会有所帮助：

// You should already have a function
// to compute (Square-)distance between 2 Points
const float square_distance(const Point& p, const Point& p2)
{
    const float diffx = p.x - p2.x;
    const float diffy = p.y - p2.y;
    const float diffz = p.z - p2.z;
    return diffx * diffx + diffy * diffy + diffz * diffz;
}

bool isInsideSphere(const Point& p, const Point& center, float radius)
{
    // we compare square instead of squareRoot for efficiency.
    return square_distance(p, center) <= radius * radius;
}

然后：

for (int i = 0; i <= nombre; ++i) {                // the spheres indexes
    glBegin(GL_TRIANGLE_STRIP);
    for (int j = 0; j < tableau2[i].size(); ++j) { // each point
        bool is_present_in_other_sphere = false;
        for (int k = 0; k <= nombre; ++k) {        //other spheres created
            if (i != k) { continue; }

            if (isInsideSphere(tableau2[i][j], Vpoint[k], Vrayon[k])) {
                is_present_in_other_sphere = true;
                break;
            }
        }
        if (is_present_in_other_sphere == false) {
            glVertex3fv(&tableau2[i][j].x);
        }
    }
    glEnd();
}

如何消除两个球体之间的点交叉

1 个答案: