cam_pos      = [-0.896216, 1.64066, -0.801892]';
cam_dir      = [-0.245586, 0.368088, 0.896771]';
cam_up       = [0.0340324, 0.927806, -0.371507]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.28847, 0.0807545, 0.319709]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;