cam_pos      = [0.344211, 2.0162, 0.124585]';
cam_dir      = [0.273294, -0.356861, 0.893286]';
cam_up       = [-0.338246, 0.833683, 0.436534]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.19766, 0.560532, -0.142487]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;