cam_pos      = [0.417743, 1.97279, 0.302676]';
cam_dir      = [0.177674, -0.24258, 0.953723]';
cam_up       = [-0.429391, 0.85291, 0.296931]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.17767, 0.614828, -0.0630126]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;