cam_pos      = [0.129255, 0.989314, 0.530204]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.566888, 0.582151, 0.582871]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0245084, 0.928879, -0.951568]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;