can anyone explain the following opengl code?

can any one explain how glvertex3fv works when the function call

`GLfloat v[][8][3]={{{-1.5,-1.5,-1.0}, {-1.3,-1.5,-1.0}, {-1.3,-1.3,-1.0}, {-1.5,-1.3,-1.0}, {-1.6,-1.6,1.0}, {-1.4,-1.6,1.0}, {-1.4,-1.4,1.0}, {-1.6,-1.4,1.0}} ,

{{-1.3,-1.5,-1.0}, {-1.1,-1.5,-1.0}, {-1.1,-1.3,-1.0}, {-1.3,-1.3,-1.0}, {-1.4,-1.6,1.0}, {-1.2,-1.6,1.0}, {-1.2,-1.4,1.0}, {-1.4,-1.4,1.0}} ,

{{-1.1,-1.5,-1.0}, {-0.9,-1.5,-1.0}, {-0.9,-1.3,-1.0}, {-1.1,-1.3,-1.0}, {-1.2,-1.6,1.0}, {-1.0,-1.6,1.0}, {-1.0,-1.4,1.0}, {-1.2,-1.4,1.0}} ,

{{-1.5,-1.3,-1.0}, {-1.3,-1.3,-1.0}, {-1.3,-1.1,-1.0}, {-1.5,-1.1,-1.0}, {-1.6,-1.4,1.0}, {-1.4,-1.4,1.0}, {-1.4,-1.2,1.0}, {-1.6,-1.2,1.0}} ,

{{-1.3,-1.3,-1.0}, {-1.1,-1.3,-1.0}, {-1.1,-1.1,-1.0}, {-1.3,-1.1,-1.0}, {-1.4,-1.4,1.0}, {-1.2,-1.4,1.0}, {-1.2,-1.2,1.0}, {-1.4,-1.2,1.0}} ,

{{-1.1,-1.3,-1.0}, {-0.9,-1.3,-1.0}, {-0.9,-1.1,-1.0}, {-1.1,-1.1,-1.0}, {-1.2,-1.4,1.0}, {-1.0,-1.4,1.0}, {-1.0,-1.2,1.0}, {-1.2,-1.2,1.0}} ,

{{-1.5,-1.1,-1.0}, {-1.3,-1.1,-1.0}, {-1.3,-0.9,-1.0}, {-1.5,-0.9,-1.0}, {-1.6,-1.2,1.0}, {-1.4,-1.2,1.0}, {-1.4,-1.0,1.0}, {-1.6,-1.0,1.0}} ,

{{-1.3,-1.1,-1.0}, {-1.1,-1.1,-1.0}, {-1.1,-0.9,-1.0}, {-1.3,-0.9,-1.0}, {-1.4,-1.2,1.0}, {-1.2,-1.2,1.0}, {-1.2,-1.0,1.0}, {-1.4,-1.0,1.0}} ,

{{-1.1,-1.1,-1.0}, {-0.9,-1.1,-1.0}, {-0.9,-0.9,-1.0}, {-1.1,-0.9,-1.0}, {-1.2,-1.2,1.0}, {-1.0,-1.2,1.0}, {-1.0,-1.0,1.0}, {-1.2,-1.0,1.0}}};

GLfloat colors[][3]={{0.0,0.0,0.0}, //black

{1.0,0.0,0.0}, //red

{1.0,1.0,0.0}, //yellow

{0.0,1.0,0.0}, //green

{1.0,0.0,1.0}, //magenta

{0.0,1.0,1.0}}; //cyan ....

void polygon(int a,int b,int c,int d,int i)

{

glBegin(GL_POLYGON);

glColor3fv(colors[a]);

glVertex3fv(v[i][a]); //wt is the meaning of this line

glColor3fv(colors[b]);

glVertex3fv(v[i][b]);

glColor3fv(colors[c]);

glVertex3fv(v[i][c]);

glColor3fv(colors[d]);

glVertex3fv(v[i][d]);

glFlush();

glEnd(); }

void colorcube() {

polygon(0,3,2,1,i); //wt is the meaning of i

polygon(2,3,7,6,i);

polygon(0,4,7,3,i);

polygon(1,2,6,5,i);

polygon(4,5,6,7,i);

polygon(0,1,5,4,i);

} `