cam_pos      = [0.654177, 1.44454, 1.31596]';
cam_dir      = [-0.761341, -0.050091, 0.646413]';
cam_up       = [-0.244096, 0.945798, -0.214204]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.798861, 0.426756, 0.973962]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;