cam_pos      = [-0.614156, 1.67438, 1.5015]';
cam_dir      = [0.949357, -0.309023, 0.0568084]';
cam_up       = [0.304906, 0.862436, -0.404025]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.100893, -0.533177, -1.21427]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;