cam_pos      = [-0.780941, 1.65939, 1.35638]';
cam_dir      = [0.971863, -0.130274, 0.196244]';
cam_up       = [0.197983, 0.90316, -0.380927]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.169728, -0.544052, -1.20171]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;