c++ strchr函数_strchr函数返回_模拟实现strchr函数(37)

line3ret;

ret.a=parallel(v.a,v.b,u.a,u.b,u.c)?intersection(v.b,v.c,u.a,u.b,u.c):intersection(v.a,v.b,u.a,u.b,u.c);

ret.b=parallel(v.c,v.a,u.a,u.b,u.c)?intersection(v.b,v.c,u.a,u.b,u.c):intersection(v.c,v.a,u.a,u.b,u.c);

returnret;

}

line3 intersection(point3 u1,point3u2,point3 u3,point3 v1,point3 v2,point3 v3){

line3ret;

ret.a=parallel(v1,v2,u1,u2,u3)?intersection(v2,v3,u1,u2,u3):intersection(v1,v2,u1,u2,u3);

ret.b=parallel(v3,v1,u1,u2,u3)?intersection(v2,v3,u1,u2,u3):intersection(v3,v1,u1,u2,u3);

returnret;

}

double ptoline(point3 p,line3 l){

returnvlen(xmult(subt(p,l.a),subt(l.b,l.a)))/distance(l.a,l.b);

}

double ptoline(point3 p,point3 l1,point3l2){

returnvlen(xmult(subt(p,l1),subt(l2,l1)))/distance(l1,l2);

}

double ptoplane(point3 p,plane3 s){

returnfabs(dmult(pvec(s),subt(p,s.a)))/vlen(pvec(s));

}

double ptoplane(point3 p,point3 s1,point3s2,point3 s3){

returnfabs(dmult(pvec(s1,s2,s3),subt(p,s1)))/vlen(pvec(s1,s2,s3));

}

double linetoline(line3 u,line3 v){

point3n=xmult(subt(u.a,u.b),subt(v.a,v.b));

returnfabs(dmult(subt(u.a,v.a),n))/vlen(n);

}

double linetoline(point3 u1,point3u2,point3 v1,point3 v2){

point3n=xmult(subt(u1,u2),subt(v1,v2));

returnfabs(dmult(subt(u1,v1),n))/vlen(n);

}

double angle_cos(line3 u,line3 v){

returndmult(subt(u.a,u.b),subt(v.a,v.b))/vlen(subt(u.a,u.b))/vlen(subt(v.a,v.b));

}

double angle_cos(point3 u1,point3 u2,point3v1,point3 v2){

returndmult(subt(u1,u2),subt(v1,v2))/vlen(subt(u1,u2))/vlen(subt(v1,v2));

}

double angle_cos(plane3 u,plane3 v){

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