cam_pos      = [0.12098, 1.36199, 0.767585]';
cam_dir      = [0.849124, 0.0327927, -0.527175]';
cam_up       = [-0.522507, 0.198205, -0.829277]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.102802, -1.30288, -0.246629]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;