cam_pos      = [-1.26033, 1.5046, 0.800487]';
cam_dir      = [0.665073, 0.108898, 0.738795]';
cam_up       = [0.0986673, 0.967824, -0.231478]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.984507, -0.301704, -0.841796]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;