cam_pos      = [0.246262, 1.80632, 0.671458]';
cam_dir      = [-0.232438, -0.15139, 0.960757]';
cam_up       = [-0.540242, 0.841508, 0.00189806]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.07567, 0.689738, 0.368923]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;