cam_pos      = [-0.599042, 1.10234, 0.089243]';
cam_dir      = [-0.338924, 0.175934, -0.924217]';
cam_up       = [0.938243, 0.135779, -0.318221]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0924401, 1.29674, 0.280746]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;