glColor3f(1.0f,1.0f,1.0f); //white
else
glColor3f(0.0f,0.0f,0.0f); //black
glColor3f(1.0f,1.0f,1.0f); //white
else
glColor3f(0.0f,0.0f,0.0f); //black
glVertex3f( x*SizeX,0.0, y*SizeY);
glVertex3f((x+1)*SizeX,0.0, y*SizeY);
glVertex3f((x+1)*SizeX,0.0, (y+1)*SizeY);
glVertex3f( x*SizeX,0.0, (y+1)*SizeY);
glVertex3f( x*SizeX,0.0, y*SizeY);
glVertex3f((x+1)*SizeX,0.0, y*SizeY);
glVertex3f((x+1)*SizeX,0.0, (y+1)*SizeY);
glVertex3f( x*SizeX,0.0, (y+1)*SizeY);