cam_pos      = [-0.287437, 1.44791, 0.97196]';
cam_dir      = [0.776489, 0.0545058, 0.627769]';
cam_up       = [-0.0681152, 0.997675, -0.00237087]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.833163, 0.0544232, -1.03527]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;