cam_pos      = [-0.933, 1.6819, -0.420098]';
cam_dir      = [-0.176737, -0.0576163, 0.98257]';
cam_up       = [0.00449542, 0.998228, 0.0593431]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.30905, -0.0198239, 0.234299]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;