# Spline Lid and Mouth Ctrls are not following facialBS **URL:** \ **Category:** Face Rigging\ **Created:** [May 20, 2026, 12:46pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76 "2026-05-20T12:46:01Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Gurpreet](https://avatars.discourse-cdn.com/v4/letter/g/fbc32d/32.png) [@Gurpreet](https://kangaroobuilder.discourse.group/u/Gurpreet)\ **Post date:** [May 20, 2026, 12:46pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/1 "2026-05-20T12:46:01Z")
Hi everyone, I’m having an issue with facial setup. The Spline Lid controls and Mouth controls are not following the FacialBS (facial blendShapes). The blendShapes work, but those controls stay at the original place. Has anyone faced this before or knows what could cause it? Any suggestions would help. Thanks! ---
**Author:** ![ThomasBittner](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@ThomasBittner](https://kangaroobuilder.discourse.group/u/ThomasBittner)\ **Post date:** [May 20, 2026, 12:55pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/2 "2026-05-20T12:55:56Z")
For Spline Lid Controls, which function did you use for that? And what’s the ctrls that are not following the blendShapes? I don’t think they should follow the blendShapes, because when in splines, blendShapes shouldn’t do much For the mouth ctrls - are you using splines? (bSPLINE attribute in the BASEMouthCtrls function) ---
**Author:** ![Gurpreet](https://avatars.discourse-cdn.com/v4/letter/g/fbc32d/32.png) [@Gurpreet](https://kangaroobuilder.discourse.group/u/Gurpreet)\ **Post date:** [May 20, 2026, 1:05pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/3 "2026-05-20T13:05:15Z")
For lids I used `BASELidCtrls` (`splineLidSetup`) and for mouth I used `BASEMouthCtrl` with `bSPLINES = True`. So just to confirm — if I want the controls to follow the facial blendshapes , should I be using Tweaker controls(TWEAKER\_lids, TWEAKER\_lips function) instead of the spline controls? ---
**Author:** ![ThomasBittner](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@ThomasBittner](https://kangaroobuilder.discourse.group/u/ThomasBittner)\ **Post date:** [May 20, 2026, 1:09pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/4 "2026-05-20T13:09:24Z")
Yes, Tweaker ctrls will follow the spline ctrls. Generally - if you have blendShapes, don’t do spline setups (splineLidSetup or bSPLINES on BASEMouthCtrl). Unless the spline setups are doing the main thing and you add blendShapes as correctives. ---
**Author:** ![Gurpreet](https://avatars.discourse-cdn.com/v4/letter/g/fbc32d/32.png) [@Gurpreet](https://kangaroobuilder.discourse.group/u/Gurpreet)\ **Post date:** [May 20, 2026, 1:13pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/5 "2026-05-20T13:13:44Z")
You mean Tweaker ctrls will follow the facial blendshapes? ---
**Author:** ![ThomasBittner](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@ThomasBittner](https://kangaroobuilder.discourse.group/u/ThomasBittner)\ **Post date:** [May 20, 2026, 1:14pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/6 "2026-05-20T13:14:21Z")
Yes, they follow the blendshapes ---
**Author:** ![Gurpreet](https://avatars.discourse-cdn.com/v4/letter/g/fbc32d/32.png) [@Gurpreet](https://kangaroobuilder.discourse.group/u/Gurpreet)\ **Post date:** [May 20, 2026, 1:14pm UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/7 "2026-05-20T13:14:37Z")
Got it, Thanks a lot for the fast reply and clarification! ---
**Author:** ![Gurpreet](https://avatars.discourse-cdn.com/v4/letter/g/fbc32d/32.png) [@Gurpreet](https://kangaroobuilder.discourse.group/u/Gurpreet)\ **Post date:** [May 22, 2026, 6:03am UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/8 "2026-05-22T06:03:01Z")
Hi Thomas, As you suggested, I tried the `TWEAKER_lids` and `TWEAKER_lips` functions. I also enabled `BASELidCtrls -> simpleLidSetup` and set `BASEMouthCtrls -> bSPLINES = False`. Now the TWEAKER controls are correctly following the facial blendshapes. However, when I open the jaw, the `tweakerLipsBot` controls are not moving with the jaw and remain in their original position. Could you please let me know if I’m missing an additional setup step or connection for the lower lip tweakers to follow the jaw movement properly? Thanks! ---
**Author:** ![ThomasBittner](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@ThomasBittner](https://kangaroobuilder.discourse.group/u/ThomasBittner)\ **Post date:** [May 22, 2026, 6:28am UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/9 "2026-05-22T06:28:38Z")
They should be moving with the skinCluster that opens the jaw. Is the skinCluster name correctly - “skinCluster\_\_[meshname]”, and is that the one that is opening the jaw? ---
**Author:** ![Gurpreet](https://avatars.discourse-cdn.com/v4/letter/g/fbc32d/32.png) [@Gurpreet](https://kangaroobuilder.discourse.group/u/Gurpreet)\ **Post date:** [May 22, 2026, 9:02am UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/10 "2026-05-22T09:02:03Z")
You were right — after exporting the deformer weights and rebuilding it again, it started working correctly. I have another question related to attachments on the face. For example, if we have whiskers and added an FK chain for them, what would be the correct way to attach their controls to the face so they follow the facial deformation properly, similar to how the tweaker controls are following? ---
**Author:** ![ThomasBittner](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@ThomasBittner](https://kangaroobuilder.discourse.group/u/ThomasBittner)\ **Post date:** [May 22, 2026, 9:16am UTC](https://kangaroobuilder.discourse.group/t/spline-lid-and-mouth-ctrls-are-not-following-facialbs/76/11 "2026-05-22T09:16:29Z")
Please make new post if that is a new topic 🙃