cam_pos      = [-0.102171, 1.5243, 0.75683]';
cam_dir      = [0.9641, -0.131901, 0.230464]';
cam_up       = [0.265534, 0.472732, -0.840248]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.00250305, -1.1588, -0.652744]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;