cam_pos      = [-0.141845, 0.726165, 1.19232]';
cam_dir      = [0.848755, 0.487663, 0.204451]';
cam_up       = [-0.521738, 0.709394, 0.473867]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.114448, 0.676793, -1.13919]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;