vex 从放弃到入门

Posted 2020-10-12 HexOxZhw

1.point 模式

int snpt = npoints(1);
int spt_num = fit(ch("cur_pos"),0,1,0,snpt-1);
vector cur_pos = point(1,"P",spt_num);
@P += cur_pos;

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 2.detail 模式

int npt_l = npoints(0);
int npt_r = npoints(1);
int npt_r1 = fit(ch("cur_pos"),0,1,0,npt_r-1);
vector cur_pos = point(1,"P",npt_r1);
for(int i =0; i<npt_l;i++)
{
    vector sphere_pos = point(0,"P",i);
    sphere_pos += cur_pos;
    setpointattrib(geoself(),"P",i,sphere_pos);
}

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3.detail 模式 四边形 插入点

int nprm_t = nprimitives(1);
int add_points = ch("add_points");
for(int i = 0;i<nprm_t;i++)
{
    int spt_num1 = primpoint(1,i,0);
    int spt_num2 = primpoint(1,i,1);
    int spt_num3 = primpoint(1,i,3);
    
    vector tmp1 = point(1,"P",spt_num1);
    vector tmp2 = point(1,"P",spt_num2);
    vector tmp3 = point(1,"P",spt_num3);

    vector tmpU = tmp2 - tmp1;
    vector tmpV = tmp3 - tmp1;
    vector tmp = set(0,0,0);
    for(int j = 0; j< add_points ;j++)
    {
        float r1 = rand(j+1);
        float r2 = rand(j*10+3);
        tmp = tmpU*r1 + tmpV*r2;
        tmp += tmp1;
        int rtn = addpoint(geoself(),tmp);
    }

    
}

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4.detail 模式 三角面 插入点

...

 5:vex detail

point 模式是每一个点一个线程，在point模式下addpoint（）,一次add是npt个点，point模式下要拷贝第一个入口的东东,wrangle不能单独运行。

detail 模式是一个wrangle一个线程，addpoint要用循环，不用连接任何入口，可以单独运行。

wrangle节点要拷贝一份第一个入口的东东。

int point_num = chi("point_num");
float radius = ch("radius");
vector trans = chv("trans");
int row = chi("row");
vector rot_axis = chv("rot_axis");
float pi = 3.1415926;


if(ch("radius")>0)
{
    for(float i = 0;i<point_num;i++)
    {
        //printf("%f %f %f\\n",point.x,point.y,point.z);
        for(int j = 0;j<row;j++)
        {
            if(rot_axis == (0,0,0))
            {
                return;
            }
            vector point_t = set(0,0,0);
            point_t.x = radius*sin(2*pi*i/point_num);
            point_t.y = radius*cos(2*pi*i/point_num);
            matrix m_rot = ident();
            rotate(m_rot,2*pi*j/row,rot_axis);
            point_t *= m_rot;
            //printf("%g\\n",m_rot);
            matrix m_tan = ident();
            translate(m_tan,trans);
            //transpose(m_tan);
            //printf("%g\\n",m_tan);
            point_t *= m_tan;
            addpoint(0,point_t);
        }
    }
}

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