cam_pos      = [-0.101764, 1.26011, 1.33624]';
cam_dir      = [0.658438, -0.0635338, -0.749948]';
cam_up       = [-0.377183, 0.834416, -0.401848]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.866229, -0.728122, -0.698846]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;