cam_pos      = [0.69838, 1.64486, 0.327699]';
cam_dir      = [-0.246617, -0.297056, -0.922463]';
cam_up       = [0.0183819, 0.950258, -0.310922]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.28869, 0.124535, 0.304422]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;