cam_pos      = [-0.189138, 1.54253, 0.842178]';
cam_dir      = [-0.760507, 0.258401, 0.5957]';
cam_up       = [-0.282257, 0.694643, -0.661666]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.777749, 0.892885, 0.60561]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;