cam_pos      = [-0.581374, 1.05887, 0.57024]';
cam_dir      = [0.998919, -0.0453699, -0.0101526]';
cam_up       = [0.0455975, 0.998685, 0.0234394]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0120709, 0.0317564, -1.32957]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;