cam_pos      = [0.142004, 1.0346, 0.711288]';
cam_dir      = [0.561626, 0.399672, -0.724457]';
cam_up       = [-0.774668, -0.0535536, -0.630096]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.386537, -1.21707, -0.371783]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;