cam_pos      = [-0.299256, 0.569123, 1.29753]';
cam_dir      = [0.902327, 0.431024, 0.00487956]';
cam_up       = [-0.384625, 0.799979, 0.46054]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.258818, 0.555187, -1.18054]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;