cam_pos      = [0.49077, 1.46342, 1.42995]';
cam_dir      = [-0.954766, -0.0248002, 0.296323]';
cam_up       = [-0.180265, 0.840798, -0.510454]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.314529, 0.719239, 1.07362]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;