cam_pos      = [-0.286917, 1.49208, 0.654962]';
cam_dir      = [0.901917, -0.176196, 0.394336]';
cam_up       = [0.425906, 0.514515, -0.74423]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.0954436, -1.11611, -0.716994]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;