How do I keep the eye 's lookat rotation and at the same time stretch with the head’s stretchy bone?
there is a double transformation(position-rotation-scale) happens to the eye from the ffd spacewarp that is skined to the head stretchy bone to stretch with it and the look at target that is linked to the ctrl of the head
3ds max
Hi Mahmoud,
It would help if you had a scene file. It might be just simple mistake easily fixed. However, if I understood correctly what your case is here is a solution:
FFD spacewarp seems like good choice, but remember, it does not transform node/object, it moves verts.
1. Have mesh, make bones + skin to mesh (head, in this case)
2. Create eye containing FFD WSD object
3. Skin FFD WSD object to same bones as head
4. Move eye into FFD volume, link to FFD spacewarp. Now you are mostly done with eye *mesh*
5. Create box or similar *geometry*, call it "root_attach"
6. Now bind this to FFD. This is important. Since pivot is not moving....
7. Create point, call it "root_point"
8. Attach constrain "root_point" to "root_attach" front facing polygon
9. Create point, call it "lookat"
10. Make "root_point" lookat constrained to "lookat"
11. Finally, orient constrain eye mesh to "root_point"
This way, your "root_attach" + "root_point" simulate moving pivot inside FFD volume, otherwise it will stick to default location. There is no need to link eye ball. It will move inside FFD volume.
Hope this helps, let me know if it works for you!Transmuter, you’re a genius. I really struggled with this and your method works perfectly. Thanks 
Hey guys, I was testing this eye setup but I got a problem… When I rotate the head (it’s a 4 bone chain made with CAT) the eyes goes a bit too far up… It’s doesn’t keep looking at the correct point! The pivot of the eye mesh is following the rotation correctly, but when the FFD deforms the eyes, the mesh follows the pivot rotation and end up with an “offseted look at constraint”.
I’ll put some images to show you my problem
The blue circle is the “lookat”, the green point with axis is the “root_point” and the “root_attach” is the box is inside the eye mesh.
I’m having a bad time trying to fix this… any idea?
Cheers!
If you are using a stretchy head bone, you can do it by having two skin modifiers: one for skinning the eye’s rotation via lookat bone, and another on top of it for skinning to the squash/stretch bone. That way you first turn the eye, then stretch it.
[edit] Forgot to mention: link the eye mesh to what the lookats are linked to (usually the head bone), else you will be getting double transforms for the two skin modifiers.
This doesn’t make much sense for me… I should create a bone with look at constraint for the eyes, and skin the eye mesh to this bone, then make another skin for the whole mesh + eye? I’m using the Trasmuter setup, with FFD, box, attachment constraint etc…
I think I got it working properly now! Your [edit] part made me think a bit and I linked the eye, FFD and box mesh to the central head bone (the same that the look at target is linked) and uncheck the “Inherit scale” on the Link Info panel. Seems pretty good now!
Cheers!!
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