I used Python scripting to create an automatic spine rig in Maya.
Following the method used in the Maya Learning Channels video series on Advanced Character Rigging.
== https://youtube.com/playlist?list=PL8hZ6hQCGHMXKqaX9Og4Ow52jsU_Y5veH
and the code:
import maya.cmds as mc
def MakeChange(val, field):
val= mc.floatFieldGrp(field, query=True, value=True)[0]
return val
def SplineIKCreator(ctrlScale):
mc.select(hi=True)
SpineJts= mc.ls(sl=True)
mc.select(clear=True)
root= SpineJts[0]
rootCoords = mc.xform(root, ws=True,q=True, t=True)
HipCtrlJt=mc.joint(p=rootCoords, n="HipCtrlJoint")
mc.select(clear=True)
end = SpineJts[len(SpineJts)-1]
endCoords = mc.xform(end, ws=True,q=True, t=True)
ShoulderCtrlJt=mc.joint(p=endCoords, n="ShoulderCtrlJoint")
mc.select(clear=True)
ShoulderCtrlCurve = mc.curve(n="ShoulderCtrl", p=[[-2.103, 5.022, -2.864], [-2.617, 7.232, -3.451], [2.617, 7.232, -3.451], [2.617, 7.232, 2.05], [-2.617, 7.232, 2.05], [-2.617, 7.232, -3.451], [-2.617, 7.232, 2.05], [-2.103, 5.022, 1.477], [-2.103, 5.022, -2.864],[-2.103, 5.022, 1.477], [2.103, 5.022, 1.477], [2.617, 7.232, 2.05], [2.103, 5.022, 1.477], [2.103, 5.022, -2.864], [2.617, 7.232, -3.451], [2.103, 5.022, -2.864], [-2.103, 5.022, -2.864], [-2.617, 7.232, -3.451]], d=1)
mc.select(ShoulderCtrlCurve)
mc.CenterPivot
mc.xform(cpc=True)
mc.scale(ctrlScale,ctrlScale,ctrlScale)
mc.select(end, add=True)
mc.matchTransform(pos=True)
mc.makeIdentity(a=True, s=True, t=True)
mc.select(ShoulderCtrlCurve, r=True)
HipCtrlCurve = mc.duplicate(n="HipCtrl")
mc.scale(1,-1,1)
mc.select(root, add=True)
mc.matchTransform(pos=True)
mc.makeIdentity(a=True, s=True, t=True)
mc.select(clear=True)
mc.select(root)
mc.joint(e=True, oj="xzy", sao="xup", ch=True, zso=True)
mc.select(root)
mc.select(end,add=True)
spineIK=mc.ikHandle (sol="ikSplineSolver", scv=False, ns=3, n="spineIKHandle")
mc.select(clear=True)
mc.select(HipCtrlJt, ShoulderCtrlJt)
mc.select(spineIK[2], add=True)
mc.skinCluster(bm=0, sm=0, nw=1, mi=2, dr=3)
mc.rename(spineIK[2] ,'SpineCurve')
mc.select(clear=True)
mc.parentConstraint(HipCtrlCurve, HipCtrlJt,mo=0)
mc.parentConstraint(ShoulderCtrlCurve, ShoulderCtrlJt,mo=0)
mc.setAttr("spineIKHandle.dTwistControlEnable", 1)
mc.setAttr ("spineIKHandle.dWorldUpType", 4)
mc.connectAttr('HipCtrlJoint.xformMatrix', 'spineIKHandle.dWorldUpMatrix', f=True)
mc.connectAttr('ShoulderCtrlJoint.xformMatrix', 'spineIKHandle.dWorldUpMatrixEnd', f=True)
mc.setAttr ("spineIKHandle.dWorldUpType", 4)
mc.setAttr ("spineIKHandle.dWorldUpVectorY", 0)
mc.setAttr ("spineIKHandle.dWorldUpVectorEndY", 0)
mc.setAttr ("spineIKHandle.dWorldUpVectorZ", -1)
mc.setAttr ("spineIKHandle.dWorldUpVectorEndZ", -1)
mc.setAttr ("spineIKHandle.dWorldUpAxis", 1)
mc.select(cl=True)
mc.select('SpineCurveShape')
spinelen=mc.arclen(ch=True)
mc.rename(spinelen, "spineInfo")
SpineStretchDiv=mc.shadingNode("multiplyDivide",au=True,n="spineStretchDiv")
mc.setAttr("spineStretchDiv.operation",2)
mc.connectAttr ("spineInfo.arcLength", "spineStretchDiv.input1X", f=True)
arlen= mc.getAttr('spineInfo.arcLength')
mc.setAttr("spineStretchDiv.input2X", float(arlen))
i=0
for jts in SpineJts:
if i < len(SpineJts)-1:
mc.connectAttr("spineStretchDiv.outputX", jts+".scaleX")
i+=1
#mc.parentConstraint()
def FKControlCreator(ctrlScale):
i=0
FKSpineJts = mc.ls(sl=True)
mc.select(clear=True)
for jts in FKSpineJts:
Coords = mc.xform(jts, ws=True,q=True, t=True)
jointname = "SpineFKJoint{}"
ctrlname= "SpineFkCtrl{}"
# circle -c 0 0 0 -nr 0 1 0 -sw 360 -r 1 -d 3 -ut 0 -tol 0.01 -s 8 -ch 1;
if(i>0):
mc.select(jointname.format(i-1))
jt = mc.joint(p=Coords, n=jointname.format(i))
mc.joint(e=True, oj="xzy", sao="xup", ch=True, zso=True)
if(i>0 and i<3):
circ = mc.circle(c= [0,0,0], nr= [0,1,0], sw=360, r=ctrlScale, d= 3, ut =0, tol= 0.01, s=8, ch= 1, n=ctrlname.format(i))
mc.select(ctrlname.format(i)+"Shape",r=True)
mc.select(jt, add=True)
mc.parent(r=True, s=True)
i+=1
mc.select("SpineFKJoint0")
#mc.joint(e=True, oj="xzy", sao="xup", ch=True, zso=True)
hipFKConstGrp = mc.group('HipCtrl', n='HipFKConstGroup')
shldrFkConstGrp= mc.group('ShoulderCtrl', n='ShoulderFKConstGroup')
mc.parentConstraint("SpineFKJoint0", hipFKConstGrp, mo=True)
mc.parentConstraint("SpineFKJoint3", shldrFkConstGrp, mo=True)
# Import the Maya commands library
# Create a window using the cmds.window command
# give it a title, icon and dimensions
window = mc.window( title="Spine Control Creation", iconName='Short Name', widthHeight=(320, 100) )
# As we