cam_pos      = [0.500832, 1.49727, 0.295048]';
cam_dir      = [-0.67987, 0.242749, -0.69199]';
cam_up       = [0.377247, 0.924961, -0.0461647]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.83638, 0.388941, 0.958172]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;