cam_pos      = [0.354908, 0.785945, 0.267537]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.566193, 0.563281, 0.60178]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0446458, 0.949237, -0.930515]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;