cam_pos      = [0.185755, 0.93754, 0.465358]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.566716, 0.576354, 0.588769]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0307447, 0.935252, -0.945123]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;