Ràng Buộc IK Spline (Spline IK Constraint)¶
The Spline IK constraint aligns a chain of bones along a curve. By leveraging the ease and flexibility of achieving aesthetically pleasing shapes offered by curves and the predictability and well-integrated control offered by bones, Spline IK is an invaluable tool in the riggers' toolbox. It is particularly well suited for rigging flexible body parts such as tails, tentacles, and spines, as well as inorganic items such as ropes.
To set up Spline IK, it is necessary to have a chain of connected bones and a curve to constrain these bones to:
With the last bone in the chain selected, add a Spline IK constraint from the Bone Constraints tab in the Properties.
Set the 'Chain Length' setting to the number of bones in the chain (starting from and including the selected bone) that should be influenced by the curve.
Finally, set Target to the curve that should control the curve.
Ghi chú
The IK constraints are special in that they modify multiple bones. For this reason, they ignore their position in the stack and always run after all other constraints on the affected bones. To apply constraints after IK, it is necessary to first copy the final transformation to a new bone chain, e.g. using Copy Transforms.
Các Tùy Chọn (Options)¶
Spline IK panel.¶
- Mục Tiêu (Target)
ID Dữ Liệu (Data ID) used to select the target curve. See common constraint properties for more information.
- Tác Động/Ảnh Hưởng (Influence)
Controls the percentage of affect the constraint has on the object. See common constraint properties for more information.
Khít Vừa (Fitting)¶
- Chiều Dài của Dây Chuyền (Chain Length)
Số lượng xương kết nối trong dây chuyền.
- Phân Chia Đều (Even Division)
Ignore the relative length of the bones when fitting to the curve.
- Dịch Chuyển của Dây Chuyền (Chain Offset)
Retain the offset of the root joint from the start point of the curve.
Đổi tỷ lệ Dây Chuyền (Chain Scaling)¶
- Dùng Bán Kính Đường Cong (Use Curve Radius)
Average radius of the endpoints is used to tweak the X and Z scaling of the bones, on top of the X and Z scale mode.
- Chế Độ Tỷ Lệ Hóa Y (Y Scale Mode)
Specifies how the length of a bone is scaled when it is fitted to the curve, in addition to the effects of target curve object scale and curvature.
- Không (None)
The bone is reset to its rest pose length.
- Khít Vừa Đường Cong (Fit Curve)
The bones are stretched to cover the entire length of the curve.
- Nguyên Gốc của Xương (Bone Original)
The original Y axis scale of the bone is used.
- Chế Độ Đổi Tỷ Lệ XZ (XZ Scale Mode)
Scaling that a bone undergoes in the other two directions.
- Không (None)
Do not scale the X and Z axes.
- Nguyên Gốc của Xương (Bone Original)
Dùng tỷ lệ gốc của các xương.
- Đảo Nghịch Tỷ Lệ (Inverse Scale)
Scale of the X and Z axes is the inverse of the Y scale.
- Giữ Nguyên Thể Tích (Volume Preservation)
Similar to the Stretch To constraint.
- Sử Dụng Tỷ Lệ Gốc (Use Original Scale)
Specifies that Inverse Scale or Volume Preservation should be applied on top of the original scaling of the bones, like in the Stretch To constraint.
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This subject is seen in-depth in the Armature Posing section.