B-SPACE.rar_均匀B样条曲面

//NURBS 曲面

double NURBSS(int k,double su[],int l,double sv[],double **d,double

**w,int m,double u,int n,double v)

{

int i,j,tu=k,tv=l;

double s1=0.0,s2=0.0,wN;

for(i=0;i <m+1;i++)

{

if(u <=su[i])

{

if(v <=sv[j])

{

tv=j-1;

break;

}

}

if(tu <k)tu=k;

if(tv <l)tv=l;

for(i=tu-k;i <=tu;i++)

}

}

if(s2> eps||s2 <-eps) return s1/s2;

else return 0.0;

}

//均匀 B 样条曲线

double UBSL(int k,double d[],int n,double u)

{

double s,*su=new double[n+k+1];

int i;

for(i=0;i <n+k+1;i++) su[i]=double(i)/(n+k);

s=BSL(k,su,d,n,u);

delete []su;

return s;

}

//准均匀 B 样条曲线

for(i=0;i <k;i++) su[i]=0.0;

for(i=k;i <=n;i++) su[i]=double(i-k)/(n-k);

for(i=n+1;i <n+k+1;i++) su[i]=1.0;

s=BSL(k,su,d,n,u);

delete []su;

return s;

}

//均匀 B 样条曲面

double UBSS(int k,int l,double **d,int m,double u,int n,double v)

delete []su;

delete []sv;

return s;

}

//准均匀 B 样条曲面