yohawing · September 30, 2023 03:00 · Sep 26, 2023 · Sep 26, 2023
diff --git a/createStretchySplineIK.py b/createStretchySplineIK.py
@@ -38,7 +38,7 @@ def create_stretchy_spline_ik(start_joint, end_joint, ik_name):
     # ノードを接続
     cmds.connectAttr(curve_info + ".arcLength", mult_node + ".input1X")
 
-    for jnt in spline_joints[:].pop(0):
+    for jnt in spline_joints:
         cmds.connectAttr(mult_node + ".outputX", jnt + ".scaleX")
 
     return ik_handle, curve

diff --git a/createStretchySplineIK.py b/createStretchySplineIK.py
@@ -0,0 +1,60 @@
+import maya.cmds as cmds
+
+# StartJointからEndJointに関連付けられているJointをListで取得
+# Childが一つの想定なので骨が複数あるとおかしくなるかも。
+def get_all_spline_joints(joint_list, parent_joint, last_joint):
+    child = cmds.listRelatives(parent_joint, children=True, type="joint")
+    joint_list.append(child[0])
+    if child and last_joint not in child:
+        get_all_spline_joints(joint_list, child[0], last_joint)
+    else:
+        return joint_list
+
+# StretchySplineIKを自動作成するスクリプト
+def create_stretchy_spline_ik(start_joint, end_joint, ik_name):
+
+    spline_joints = [start_joint]
+    get_all_spline_joints(spline_joints, start_joint, end_joint)
+
+    # Spline IKの作成
+    ik_handle, effector, curve = cmds.ikHandle(
+        sj=start_joint,
+        ee=end_joint,
+        sol='ikSplineSolver',
+        createCurve=True,
+        numSpans=2,
+        n=ik_name)
+
+    curve_info = cmds.arclen(curve, ch=True)
+
+    # ジョイントチェーンの初期長さを取得
+    original_curve_length = cmds.getAttr(curve_info + ".arcLength")
+
+    # スケールノードを作成
+    mult_node = cmds.shadingNode('multiplyDivide', asUtility=True, n=ik_name + "_multDiv")
+    cmds.setAttr(mult_node + ".operation", 2)  # Divide
+    cmds.setAttr(mult_node + ".input2X", original_curve_length)
+
+    # ノードを接続
+    cmds.connectAttr(curve_info + ".arcLength", mult_node + ".input1X")
+
+    for jnt in spline_joints[:].pop(0):
+        cmds.connectAttr(mult_node + ".outputX", jnt + ".scaleX")
+
+    return ik_handle, curve
+
+# CurveのControlPointにClusterを自動作成するスクリプト
+def apply_clusters_to_curve(curve_name):
+    curveCVs = cmds.ls('{0}.cv[:]'.format(curve_name), fl=True)
+    for cv in curveCVs:
+        cmds.cluster(cv)
+
+# How To Use
+selected_joints = cmds.ls(sl=True, flatten=True, type="joint")
+
+start_joint = selected_joints[0]
+end_joint = selected_joints[1]
+ik_name = "{0}_splineIK".format(end_joint.split("_")[-1]) # ex: Character_LeftArm
+
+ik_handle, curve = create_stretchy_spline_ik(start_joint, end_joint, ik_name)
+apply_clusters_to_curve(curve)
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