cam_pos      = [0.366004, 1.8202, 0.833985]';
cam_dir      = [-0.935111, -0.273074, 0.225826]';
cam_up       = [-0.32257, 0.392185, -0.861475]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.195086, 1.1683, 0.604913]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;