cam_pos      = [-0.527896, 1.40588, 1.70706]';
cam_dir      = [0.993567, 0.0919951, -0.0660466]';
cam_up       = [-0.0868419, 0.993237, 0.0770631]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0966769, 0.0942062, -1.32313]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;