cam_pos      = [0.196748, 0.735778, -0.346955]';
cam_dir      = [0.926346, 0.0670928, 0.370651]';
cam_up       = [-0.366312, -0.068764, 0.927948]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.116702, 1.32385, 0.0520328]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;