cam_pos      = [0.298247, 1.10369, 0.349868]';
cam_dir      = [0.5106, 0.513807, -0.689413]';
cam_up       = [-0.50544, 0.82801, 0.242756]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.925108, -0.298592, -0.907698]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;