cam_pos      = [0.0785331, 1.20839, 0.784888]';
cam_dir      = [0.637681, 0.242007, -0.731297]';
cam_up       = [-0.757589, 0.0252757, -0.652242]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.185353, -1.29003, -0.265282]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;