cam_pos      = [0.103666, 1.33556, 0.774105]';
cam_dir      = [0.791357, 0.0341316, -0.610401]';
cam_up       = [-0.607531, 0.155394, -0.778947]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0907936, -1.31306, -0.191132]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;