C++ FacePointer::V方法代码示例

/**
@def Verify if a point lies on a face

@param Point3f p   - Coordinates of the point
@param FacePointer f - Pointer to the face

@return true if point p is on face f, false elsewhere.
*/
bool IsOnFace(Point3f p, CMeshO::FacePointer f){
    //Compute vectors
    Point3f a=f->V(0)->P();
    Point3f b=f->V(2)->P();
    Point3f c=f->V(1)->P();

    Point3f v0 = c-a;
    Point3f v1 = b-a;
    Point3f v2 = p-a;

    // Compute dot products
    float dot00 = v0.dot(v0);
    float dot01 = v0.dot(v1);
    float dot02 = v0.dot(v2);
    float dot11 = v1.dot(v1);
    float dot12 = v1.dot(v2);

    // Compute barycentric coordinates
    float invDenom = 1 / (dot00 * dot11 - dot01 * dot01);
    float u = (dot11 * dot02 - dot01 * dot12) * invDenom;
    float v = (dot00 * dot12 - dot01 * dot02) * invDenom;

    // Check if point is in triangle
    if(math::Abs(u)<0) u=0;
    if(math::Abs(v)<0) v=0;
    return (u >= 0) && (v >= 0) && (u + v <=1);
}

void LandmarkCapturePlugin::drawFace(CMeshO::FacePointer fp, MeshModel &m, GLArea *gla, QPainter *p)
{

  //glDepthMask(GL_FALSE);
  //glDisable(GL_DEPTH_TEST);
  //p->endNativePainting();
  //p->save();
  //p->setRenderHint(QPainter::TextAntialiasing);
  //p->setPen(Qt::white);
  //QFont qFont;
  //qFont.setStyleStrategy(QFont::NoAntialias);
  //qFont.setFamily("Helvetica");
  //qFont.setPixelSize(12);
  //p->setFont(qFont);
  QString buf = QString("f%1\n (%3 %4 %5)").arg(tri::Index(m.cm,fp)).arg(tri::Index(m.cm,fp->V(0))).arg(tri::Index(m.cm,fp->V(1))).arg(tri::Index(m.cm,fp->V(2)));
  Point3f c=Barycenter(*fp);
  vcg::glLabel::render(p,c,buf);
  for(int i=0;i<3;++i)
    {
       buf =QString("\nv%1:%2 (%3 %4 %5)").arg(i).arg(fp->V(i) - &m.cm.vert[0]).arg(fp->P(i)[0]).arg(fp->P(i)[1]).arg(fp->P(i)[2]);
      if( m.hasDataMask(MeshModel::MM_VERTQUALITY) )
        buf +=QString(" - Q(%1)").arg(fp->V(i)->Q());
      if( m.hasDataMask(MeshModel::MM_WEDGTEXCOORD) )
          buf +=QString("- uv(%1 %2) id:%3").arg(fp->WT(i).U()).arg(fp->WT(i).V()).arg(fp->WT(i).N());
      if( m.hasDataMask(MeshModel::MM_VERTTEXCOORD) )
          buf +=QString("- uv(%1 %2) id:%3").arg(fp->V(i)->T().U()).arg(fp->V(i)->T().V()).arg(fp->V(i)->T().N());
    vcg::glLabel::render(p,fp->V(i)->P(),buf);
    }

  //p->drawText(QRect(0,0,gla->width(),gla->height()), Qt::AlignLeft | Qt::TextWordWrap, buf);
  //p->restore();
  //p->beginNativePainting();
}

/**
@def Compute the intersection of the segment from p1 to p2 and the face f

@param CoordType p1 - position of the first point
@param Coordtype p2 - position of the second point
@param Facepointer f - pointer to the face
@param CoordType int_point - intersection point this is a return parameter for the function.
@param FacePointer face - pointer to the new face

@return the intersection edge index if there is an intersection -1 elsewhere
Step
*/
int ComputeIntersection(CMeshO::CoordType p1,CMeshO::CoordType p2,CMeshO::FacePointer &f,CMeshO::FacePointer &new_f,CMeshO::CoordType &int_point){

    CMeshO::CoordType v0=f->V(0)->P();
    CMeshO::CoordType v1=f->V(1)->P();
    CMeshO::CoordType v2=f->V(2)->P();
    float dist[3];
    Point3f int_points[3];
    dist[0]=PSDist(p2,v0,v1,int_points[0]);
    dist[1]=PSDist(p2,v1,v2,int_points[1]);
    dist[2]=PSDist(p2,v2,v0,int_points[2]);
    int edge=-1;
    if(dist[0]<dist[1]){
        if(dist[0]<dist[2]) edge=0;
        else edge=2;
    }else{
        if(dist[1]<dist[2]) edge=1;
        else edge=2;
    }

    CMeshO::VertexType* v;
    if(Distance(int_points[edge],f->V(edge)->P())<Distance(int_points[edge],f->V((edge+1) % 3)->P())) v=f->V(edge);
    else v=f->V((edge+1) % 3);
    vcg::face::Pos<CMeshO::FaceType> p(f,edge,v);
    new_f=f->FFp(edge);
    if(new_f==f) return -1;

    if(Distance(int_points[edge],v->P())<EPSILON){
        p.FlipF();
        CMeshO::FacePointer tmp_f=p.F();

        int n_face=0;
        while(tmp_f!=f){
            p.FlipE();
            p.FlipF();
            tmp_f=p.F();
            n_face++;
        }
        if(n_face!=0){
            int r=(rand()%(n_face-1))+2;
            for(int i=0;i<r;i++){
                p.FlipE();
                p.FlipF();
            }
            new_f=p.F();
        }
    }
    int_point=GetSafePosition(int_points[edge],new_f);
    return edge;
}