cam_pos      = [-0.494196, 1.42483, 1.42085]';
cam_dir      = [0.980989, 0.0776477, 0.177853]';
cam_up       = [-0.0856767, 0.995602, 0.0379058]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.23159, 0.0697227, -1.30782]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;