cam_pos      = [0.39528, 1.99846, 0.208708]';
cam_dir      = [0.224711, -0.301082, 0.926744]';
cam_up       = [-0.38538, 0.846065, 0.368315]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.19032, 0.585084, -0.0985392]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;