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Houdini script vex learning

2022-06-12 06:02:00 【Senior brother Dai Dai】

Vex Preface

Vex yes Houdini Control script , Grammatical similarity C/C++, It is convenient to write a program for manipulating geometric data .

Octahedral array program

void add_pyramid(vector pos)
{
    int p0 = addpoint(0, pos + {1, 0, 1});
    int p1 = addpoint(0, pos + {1, 0, -1});
    int p2 = addpoint(0, pos + {-1, 0, 1});
    int p3 = addpoint(0, pos + {-1, 0, -1});
    int p4 = addpoint(0, pos + {0, 1.5, 0});
    int p5 = addpoint(0, pos + {0, -1.5, 0});

    addprim(0, "poly", p2, p4, p0);
    addprim(0, "poly", p0, p4, p1);
    addprim(0, "poly", p1, p4, p3);
    addprim(0, "poly", p3, p4, p2);
    addprim(0, "poly", p0, p5, p2);
    addprim(0, "poly", p1, p5, p0);
    addprim(0, "poly", p3, p5, p1);
    addprim(0, "poly", p2, p5, p3);
}

int row = chi("row");
int colume = chi("colume");

if(row >= 1 && colume >= 1)
{
    for(int x = 0; x < row; ++x)
    {
        for(int y = 0; y < colume; ++y)
        {
            add_pyramid(set(2 * x,  2 * y, 0));
        }
    }
}

Ripple deformation of pig head

vector inf_pos = point(1, 'P', 0);
float radius = chf("radius");
int handle = pcopen(0, 'P', inf_pos, radius, chi("max_points"));
int ptnum = -1;
float distance = 0.0;
while (pciterate(handle))
{
    pcimport(0, "point:number", ptnum);
    pcimport(0, "point:distance", distance);
    if(distance > radius - chf("threshold"))
    {
        vector pos = point(0, "P", ptnum);
        vector dir = normalize(pos - inf_pos);
        setpointattrib(0, "P", ptnum, pos + dir * chf("push_distance"));
        setpointattrib(0, "Cd", ptnum, {1, 1, 0});
    }
    else 
    {
        setpointattrib(0, "Cd", ptnum, {0, 0, 1});
    }
}