cam_pos      = [0.582314, 0.585551, -0.0402731]';
cam_dir      = [0.828574, 0.408525, 0.382848]';
cam_up       = [-0.551599, 0.478472, 0.683229]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.127592, 1.03379, -0.826983]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;