cam_pos      = [-0.902336, 1.61786, -0.855823]';
cam_dir      = [-0.249042, 0.37899, 0.89126]';
cam_up       = [0.0297839, 0.922817, -0.384087]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.28749, 0.0919142, 0.320674]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;