cam_pos      = [0.477553, 1.65608, 0.313685]';
cam_dir      = [0.468158, 0.395115, -0.790387]';
cam_up       = [-0.142884, 0.916541, 0.373547]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.15978, 0.0823875, -0.64577]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;