cam_pos      = [-0.119384, 2.02523, -0.113697]';
cam_dir      = [0.685308, -0.218105, 0.694826]';
cam_up       = [-0.102248, 0.915832, 0.388325]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.958983, 0.448432, -0.805084]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;