Houdini VEX：自定义函数

函数是编程语言中最简单的一种封装，函数最重要的是参数和返回值，参数又有形式参数（简称形参）与实际参数（简称实参）之分。

int test(int a, b; string c) {
    if (a > b) {
        printf(c);
    }
}

function int[] nb(int ptnum) {
    pass
}

int[] nb(int ptnum) {
    pass
}

void createGeo(vector pos){
    int p0 = addpoint(geoself(), pos + {1, 0, 1});
    int p1 = addpoint(geoself(), pos + {1, 0, -1});
    int p2 = addpoint(geoself(), pos + {-1, 0, 1});
    int p3 = addpoint(geoself(), pos + {-1, 0, -1});
    int p4 = addpoint(geoself(), pos + {0, 1.5, 0});

    addprim(geoself(), "poly", p0, p1, p3, p2);
    addprim(geoself(), "poly", p2, p4, p0);
    addprim(geoself(), "poly", p0, p4, p1);
    addprim(geoself(), "poly", p1, p4, p3);
    addprim(geoself(), "poly", p3, p4, p2);
}

createGeo(chv("pos"));