drawfill(v1, v2, '0 0 0', 0.5, DRAWFLAG_NORMAL);
v1 = '1 1 0' * (M1 + M2);
v2_x = vid_conwidth - (2 * (M1 + M2));
v2_y = vid_conheight - (2 * (M1 + M2));
drawfill(v1, v2, '0.5 0.5 0.5', 0.5, DRAWFLAG_NORMAL);
v3 = v1 + '10 10 0';
drawfill(v1, v2, '0 0 0', 0.5, DRAWFLAG_NORMAL);
v1 = '1 1 0' * (M1 + M2);
v2_x = vid_conwidth - (2 * (M1 + M2));
v2_y = vid_conheight - (2 * (M1 + M2));
drawfill(v1, v2, '0.5 0.5 0.5', 0.5, DRAWFLAG_NORMAL);
v3 = v1 + '10 10 0';