Tutorial: Create a Procedural Ribbon in Maya

Tutorial: Create a Procedural Ribbon in Maya

Since I put up my rigging reel I’ve received a lot of questions and requests for a tutorial on the procedural ribbons, so I’ve finally put together a tutorial on them. When I finished the tutorial I realized that it was really slow-paced, so I’ve written a script for it also (attached at the bottom of this post). So for those of you that find it easier to figure out what’s going on by skimming through a script, you know what to do :)

ProceduralRibbonDemo

I’m sure this technique is old news to some people, but it’s too awesome not to be shared. These ribbons actually evaluate slightly faster than the traditional ribbon-setup, which is crazy considering they’re so much more flexible. What makes this setup powerful though, is that they utilize the nonLinear deformers in Maya, which means you inherit the same flexibility as you have with deformers, so you won’t take a performance-hit as you’re just adding functionality to the already existing deformer(s). This technique could of course easily be altered to ride ontop of FK-rigs, which could be used to rig tails/tentacles/fishes etc.

The tutorial:

The script:
The script is almost identical to the one I create in the tutorial, I’ve just added an option to offset where on the surface the twist occurs, and cleaned up the setup a bit.

jh_proceduralRibbon (Procedural Ribbon)

# ************************************************************************************************************
# Title: jh_proceduralRibbon.py
# Author: Jorn-Harald Paulsen
# Created: October 12, 2014
# Last Update: October 12, 2014
# Description: Utility to set up a ribbon with twist/sine/volume
# ************************************************************************************************************

# IMPORT MODULES
import maya.cmds as cmds
import maya.OpenMaya as OpenMaya1
import math

# UI: FUNCTION FOR BUILDING THE ELEMENTS IN THE WINDOW
def jh_proceduralRibbon():
#Create a variable for the window name
winName = ‘jh_proceduralRibbon’
winTitle = ‘Set up a ribbon with twist/sine/volume’
#Delete the window if it exists
if cmds.window(winName, exists=True):
cmds.deleteUI(winName, window=True)
#Build the main window
cmds.window(winName, title=winTitle, sizeable=True)
cmds.columnLayout(adjustableColumn=True)
#Create the columnLayout
cmds.columnLayout(adjustableColumn=True)

#Build tab
cmds.frameLayout(l=’Prefix’, mw=4, mh=4, bs=’out’, bgc=[0.18, 0.21, 0.25])
cmds.columnLayout(adjustableColumn=True)
cmds.textField(‘prefixField’, text=’ribbon_’)
cmds.setParent( ‘..’ )
cmds.setParent( ‘..’ )
#Build tab
cmds.frameLayout(l=’Scale Group (optional)’, mw=4, mh=4, bs=’out’, bgc=[0.18, 0.21, 0.25])
cmds.columnLayout(adjustableColumn=True)
cmds.button(label=’Load the scale group’, command=loadScaleGrp)
cmds.textField(‘scaleGrpField’, enable=False)
cmds.setParent( ‘..’ )
cmds.setParent( ‘..’ )
#Build tab
cmds.frameLayout(l=’Setup’, mw=4, mh=4, bs=’out’, bgc=[0.18, 0.21, 0.25])
cmds.columnLayout(adjustableColumn=True)
cmds.text(label=’Define the width of the ribbon:’)
cmds.floatField(‘widthField’, minValue=1.0, value=10.0)
cmds.text(label=’Define the number of joints:’)
cmds.intField(‘jointsField’, minValue=3, value=10)
cmds.setParent( ‘..’ )
cmds.setParent( ‘..’ )
#Build tab
cmds.frameLayout(l=’Create’, mw=4, mh=4, bs=’out’, bgc=[0.18, 0.21, 0.25])
cmds.columnLayout(adjustableColumn=True)
cmds.button(label=’Create the ribbon’, command=createRibbon)
cmds.setParent( ‘..’ )
cmds.setParent( ‘..’ )
cmds.setParent( ‘..’ )

#Show the window
cmds.showWindow(winName)
cmds.window(winName, edit=True, width=378, height=210)

# GENERAL FUNCTION: ADD ATTRIBUTE(S) ON MULTIPLE OBJECTS
def addAttribute(objects=[], longName=”, niceName=”, lock=False, **kwargs):
#For each object
for obj in objects:
#For each attribute
for x in range(0, len(longName)):
#See if a niceName was defined
attrNice = ” if not niceName else niceName[x]
#If the attribute does not exists
if not cmds.attributeQuery(longName[x], node=obj, exists=True):
#Add the attribute
cmds.addAttr(obj, longName=longName[x], niceName=attrNice, **kwargs)
#If lock was set to True
cmds.setAttr((obj + ‘.’ + longName[x]), lock=1) if lock else cmds.setAttr((obj + ‘.’ + longName[x]), lock=0)

# GENERAL FUNCTION: CREATE A CONTROL MADE OUT OF A CURVE
def createCurveCtrl(pos=(0,0,0), name=’curveCtrl’, scale=1, color=6, freezeTransforms=0):
#Create the controller
crvCtrl = cmds.curve(p=[(0,1,0),(0,-1,0),(0,0,0),(0,0,1),(0,0,-1),(0,0,0),(1,0,0),(-1,0,0)], d=1)
crvCtrl = cmds.rename(crvCtrl, name)
#Set the scale
cmds.setAttr((crvCtrl + ‘.scale’), scale, scale, scale)
cmds.makeIdentity(crvCtrl, apply=True, translate=False, rotate=False, scale=True)
#Set the color for the curve
cmds.setAttr((cmds.listRelatives(crvCtrl, shapes=True)[0] + ‘.overrideEnabled’), 1)
cmds.setAttr((cmds.listRelatives(crvCtrl, shapes=True)[0] + ‘.overrideColor’), color)
#If a position was defined
if len(pos) == 3:
#Position the locator
cmds.setAttr((crvCtrl + ‘.translate’), pos[0], pos[1], pos[2])
#If freeze transforms was set to true
if freezeTransforms:
cmds.makeIdentity(crvCtrl, apply=True, translate=True)
#Return the locator
return crvCtrl

# GENERAL FUNCTION: CREATE A FOLLICLE AND ATTACH IT TO A SURFACE
def createFollicle(inputSurface=[], scaleGrp=”, uVal=0.5, vVal=0.5, hide=1, name=’follicle’):
#Create a follicle
follicleShape = cmds.createNode(‘follicle’)
#Get the transform of the follicle
follicleTrans = cmds.listRelatives(follicleShape, parent=True)[0]
#Rename the follicle
follicleTrans = cmds.rename(follicleTrans, name)
follicleShape = cmds.rename(cmds.listRelatives(follicleTrans, c=True)[0], (name + ‘Shape’))
#If the inputSurface is of type ‘nurbsSurface’, connect the surface to the follicle
if cmds.objectType(inputSurface[0]) == ‘nurbsSurface’:
cmds.connectAttr((inputSurface[0] + ‘.local’), (follicleShape + ‘.inputSurface’))
#If the inputSurface is of type ‘mesh’, connect the surface to the follicle
if cmds.objectType(inputSurface[0]) == ‘mesh’:
cmds.connectAttr((inputSurface[0] + ‘.outMesh’), (follicleShape + ‘.inputMesh’))
#Connect the worldMatrix of the surface into the follicleShape
cmds.connectAttr((inputSurface[0] + ‘.worldMatrix[0]’), (follicleShape + ‘.inputWorldMatrix’))
#Connect the follicleShape to it’s transform
cmds.connectAttr((follicleShape + ‘.outRotate’), (follicleTrans + ‘.rotate’))
cmds.connectAttr((follicleShape + ‘.outTranslate’), (follicleTrans + ‘.translate’))
#Set the uValue and vValue for the current follicle
cmds.setAttr((follicleShape + ‘.parameterU’), uVal)
cmds.setAttr((follicleShape + ‘.parameterV’), vVal)
#Lock the translate/rotate of the follicle
cmds.setAttr((follicleTrans + ‘.translate’), lock=True)
cmds.setAttr((follicleTrans + ‘.rotate’), lock=True)
#If it was set to be hidden, hide the follicle
if hide:
cmds.setAttr((follicleShape + ‘.visibility’), 0)
#If a scale-group was defined and exists
if scaleGrp and cmds.objExists(scaleGrp):
#Connect the scale-group to the follicle
cmds.connectAttr((scaleGrp + ‘.scale’), (follicleTrans + ‘.scale’))
#Lock the scale of the follicle
cmds.setAttr((follicleTrans + ‘.scale’), lock=True)
#Return the follicle and it’s shape
return follicleTrans, follicleShape

# GENERAL FUNCTION: GROUP MULTIPLE OBJECTS
def grpObject(objects=[], snapTrans=1, snapRot=1, keepHi=1, keepTransforms=1, empty=False, name=”, suffix=’_grp’):
#Create a variable to store the groups in
groups = []
#For each object passed in
for obj in objects:
#Create an empty group for the current object
newGrp = cmds.group(empty=True, name=(obj + suffix))
#If a name was specified, rename the group
if name:
cmds.rename(newGrp, name)
#Set the rotateOrder of the current group to the same order as the current object
cmds.setAttr((newGrp + ‘.rotateOrder’), cmds.getAttr(obj + ‘.rotateOrder’))
#If snapTrans was set to true, PointConstraint the group to the current object
if snapTrans:
cmds.delete(cmds.pointConstraint(obj, newGrp))
#If snapRot was set to true, OrientConstraint the group to the current object
if snapRot:
cmds.delete(cmds.orientConstraint(obj, newGrp))
#If keepHi was set to true
if keepHi:
#Get the first parent of the current object
currParent = cmds.listRelatives(obj, parent=True)
#If a parent was found, parent the group in the first parent of the current object
if currParent:
cmds.parent(newGrp, currParent[0])
#If keepTransforms was set to false, Freeze the transformations of the group
if not keepTransforms:
cmds.makeIdentity(newGrp, apply=True, translate=True, rotate=True)
#If empty was set to false, parent the current object into the group
if not empty:
cmds.parent(obj, newGrp)
#Append the current group into the result
groups.append(newGrp)
#Return the groups
return groups

# GENERAL FUNCTION: CREATE A NONLINEAR DEFORMER
def nonlinearDeformer(objects=[], defType=None, lowBound=-1, highBound=1, translate=None, rotate=None, name=’nonLinear’):
#If something went wrong or the type is not valid, raise exception
if not objects or defType not in [‘bend’,’flare’,’sine’,’squash’,’twist’,’wave’]:
raise Exception, “function: ‘nonlinearDeformer’ – Make sure you specified a mesh and a valid deformer”
#Create and rename the deformer
nonLinDef = cmds.nonLinear(objects[0], type=defType, lowBound=lowBound, highBound=highBound)
nonLinDef[0] = cmds.rename(nonLinDef[0], (name + ‘_’ + defType + ‘_def’))
nonLinDef[1] = cmds.rename(nonLinDef[1], (name + ‘_’ + defType + ‘Handle’))
#If translate was specified, set the translate
if translate:
cmds.setAttr((nonLinDef[1] + ‘.translate’), translate[0], translate[1], translate[2])
#If rotate was specified, set the rotate
if rotate:
cmds.setAttr((nonLinDef[1] + ‘.rotate’), rotate[0], rotate[1], rotate[2])
#Return the deformer
return nonLinDef

# GENERAL FUNCTION: SET PIVOT OF OBJECT(S)
def setPivot(objects=[], rotatePivot=1, scalePivot=1, pivot=(0,0,0)):
#Make sure the input is passed on as a list
objects = [objects] if isinstance(objects, (str, unicode)) else objects
#For each object
for obj in objects:
#If rotatePivot was set to True, set the rotatePivot
if rotatePivot:
cmds.xform(obj, worldSpace=True, rotatePivot=pivot)
#If scalePivot was set to True, set the scalePivot
if scalePivot:
cmds.xform(obj, worldSpace=True, scalePivot=pivot)

# SCRIPT FUNCTION: LOAD THE SCALE GROUP
def loadScaleGrp(*args):
#Get the selected object
scaleGrp = cmds.ls(selection=True, type=”transform”)
#Update the scaleGrpField
if scaleGrp:
cmds.textField(‘scaleGrpField’, edit=True, text=scaleGrp[0])

# SCRIPT FUNCTION: CREATE THE RIBBON
def createRibbon(*args):
#Gather information
width = cmds.floatField(‘widthField’, query=True, value=True)
numJoints = cmds.intField(‘jointsField’, query=True, value=True)
prefix = cmds.textField(‘prefixField’, query=True, text=True)
scaleGrp = cmds.textField(‘scaleGrpField’, query=True, text=True)
topPoint = (width/2)
endPoint = (width/2*-1)

#Create the main groups
grpNoTransform = cmds.group(empty=True, name=(prefix + ‘noTransform_grp’))
grpTransform = cmds.group(empty=True, name=(prefix + ‘transform_grp’))
grpCtrl = cmds.group(empty=True, name=(prefix + ‘ctrl_grp’), parent=grpTransform)
grpSurface = cmds.group(empty=True, name=(prefix + ‘surface_grp’), parent=grpTransform)
grpSurfaces = cmds.group(empty=True, name=(prefix + ‘surfaces_grp’), parent=grpNoTransform)
grpDeformers = cmds.group(empty=True, name=(prefix + ‘deformer_grp’), parent=grpNoTransform)
grpFollMain = cmds.group(empty=True, name=(prefix + ‘follicles_skin_grp’), parent=grpNoTransform)
grpFollVolume = cmds.group(empty=True, name=(prefix + ‘follicles_volume_grp’), parent=grpNoTransform)
grpCluster = cmds.group(empty=True, name=(prefix + ‘cluster_grp’), parent=grpNoTransform)
grpMisc = cmds.group(empty=True, name=(prefix + ‘misc_grp’), parent=grpNoTransform)

#Create a NURBS-plane to use as a base
tmpPlane = cmds.nurbsPlane(axis=(0,1,0), width=width, lengthRatio=(1.0 / width), u=numJoints, v=1, degree=3, ch=0)[0]
#Create the NURBS-planes to use in the setup
geoPlane = cmds.duplicate(tmpPlane, name=(prefix + ‘geo’))
geoPlaneTwist = cmds.duplicate(tmpPlane, name=(prefix + ‘twist_blnd_geo’))
geoPlaneSine = cmds.duplicate(tmpPlane, name=(prefix + ‘sine_blnd_geo’))
geoPlaneWire = cmds.duplicate(tmpPlane, name=(prefix + ‘wire_blnd_geo’))
geoPlaneVolume = cmds.duplicate(tmpPlane, name=(prefix + ‘volume_geo’))
#Offset the volume-plane
cmds.setAttr((geoPlaneVolume[0] + ‘.translateZ’), -0.5)
#Delete the base surface
cmds.delete(tmpPlane)

#Create the controllers
ctrlTop = createCurveCtrl(name=(prefix + ‘top_ctrl’), freezeTransforms=1, color=9, pos=(topPoint,0,0))
ctrlMid = createCurveCtrl(name=(prefix + ‘mid_ctrl’), freezeTransforms=1, color=9, pos=(0,0,0))
ctrlEnd = createCurveCtrl(name=(prefix + ‘end_ctrl’), freezeTransforms=1, color=9, pos=(endPoint,0,0))
#Group the controllers
grpTop = grpObject(objects=[ctrlTop], snapTrans=1, keepTransforms=0, keepHi=1, empty=0, suffix=’_grp’)[0]
grpMid = grpObject(objects=[ctrlMid], snapTrans=1, keepTransforms=0, keepHi=1, empty=0, suffix=’_grp’)[0]
grpEnd = grpObject(objects=[ctrlEnd], snapTrans=1, keepTransforms=0, keepHi=1, empty=0, suffix=’_grp’)[0]
#PointConstraint the midCtrl between the top/end
midConst = cmds.pointConstraint(ctrlTop, ctrlEnd, grpMid)

#Add attributes: Twist/Roll attributes
addAttribute(objects=[ctrlTop,ctrlMid,ctrlEnd],longName=[‘twistSep’],niceName=[‘—————‘],at=”enum”,en=’Twist’,lock=1,k=True)
addAttribute(objects=[ctrlTop,ctrlEnd],longName=[‘twist’],at=”float”,k=True)
addAttribute(objects=[ctrlTop,ctrlEnd],longName=[‘twistOffset’],at=”float”,k=True)
addAttribute(objects=[ctrlTop,ctrlEnd],longName=[‘affectToMid’],at=”float”,min=0, max=10,dv=10,k=True)
addAttribute(objects=[ctrlMid],longName=[‘roll’],at=”float”,k=True)
addAttribute(objects=[ctrlMid],longName=[‘rollOffset’],at=”float”,k=True)
#Add attributes: Volume attributes
addAttribute(objects=[ctrlMid],longName=[‘volumeSep’],niceName=[‘—————‘],at=”enum”,en=’Volume’,lock=1,k=True)
addAttribute(objects=[ctrlMid],longName=[‘volume’],at=”float”,min=-1,max=1,k=True)
addAttribute(objects=[ctrlMid],longName=[‘volumeMultiplier’],at=”float”,min=1,dv=3,k=True)
addAttribute(objects=[ctrlMid],longName=[‘startDropoff’],at=”float”,min=0, max=1, dv=1,k=True)
addAttribute(objects=[ctrlMid],longName=[‘endDropoff’],at=”float”,min=0, max=1, dv=1, k=True)
addAttribute(objects=[ctrlMid],longName=[‘volumeScale’],at=”float”,min=endPoint*0.9, max=topPoint*2,k=True)
addAttribute(objects=[ctrlMid],longName=[‘volumePosition’],min=endPoint,max=topPoint,at=”float”,k=True)
#Add attributes: Sine attributes
addAttribute(objects=[ctrlMid], longName=[‘sineSep’], niceName=[‘—————‘], attributeType=’enum’, en=”Sine:”, keyable=True, lock=1)
addAttribute(objects=[ctrlMid], longName=[‘amplitude’], attributeType=”float”, keyable=True)
addAttribute(objects=[ctrlMid], longName=[‘offset’], attributeType=”float”, keyable=True)
addAttribute(objects=[ctrlMid], longName=[‘twist’], attributeType=”float”, keyable=True)
addAttribute(objects=[ctrlMid], longName=[‘sineLength’], min=0.1, dv=2, attributeType=”float”, keyable=True)
#Add attributes: Extra attributes
addAttribute(objects=[ctrlMid],longName=[‘extraSep’],niceName=[‘—————‘],at=”enum”,en=’Extra’,lock=1,k=True)
addAttribute(objects=[ctrlMid],longName=[‘showExtraCtrl’],at=”enum”,en=’Hide:Show:’,k=True)
cmds.setAttr((ctrlMid + ‘.showExtraCtrl’), 1)

#Create deformers: Twist deformer, Sine deformer, Squash deformer
twistDef = nonlinearDeformer(objects=[geoPlaneTwist[0]], defType=’twist’, name=geoPlaneTwist[0], lowBound=-1, highBound=1, rotate=(0,0,90))
sineDef = nonlinearDeformer(objects=[geoPlaneSine[0]], defType=’sine’, name=geoPlaneSine[0], lowBound=-1, highBound=1, rotate=(0,0,90))
squashDef = nonlinearDeformer(objects=[geoPlaneVolume[0]], defType=’squash’, name=geoPlaneVolume[0], lowBound=-1, highBound=1, rotate=(0,0,90))
cmds.setAttr((sineDef[0] + ‘.dropoff’), 1)
#Create deformers: Wire deformer
deformCrv = cmds.curve(p=[(topPoint,0,0),(0,0,0),(endPoint,0,0)], degree=2)
deformCrv = cmds.rename(deformCrv, (prefix + ‘ribbon_wire_crv’))
wireDef = cmds.wire(geoPlaneWire, dds=(0,15), wire=deformCrv)
wireDef[0] = cmds.rename(wireDef[0], (geoPlaneWire[0] + ‘_wire’))
#Create deformers: Clusters
clsTop = cmds.cluster((deformCrv + ‘.cv[0:1]’), relative=1)
clsMid = cmds.cluster((deformCrv + ‘.cv[1]’), relative=1)
clsEnd = cmds.cluster((deformCrv + ‘.cv[1:2]’), relative=1)
clsTop[0] = cmds.rename(clsTop[0], (ctrlTop + ‘_top_cluster’))
clsTop[1] = cmds.rename(clsTop[1], (ctrlTop + ‘_top_clusterHandle’))
clsMid[0] = cmds.rename(clsMid[0], (ctrlMid + ‘_mid_cluster’))
clsMid[1] = cmds.rename(clsMid[1], (ctrlMid + ‘_mid_clusterHandle’))
clsEnd[0] = cmds.rename(clsEnd[0], (ctrlEnd + ‘_end_cluster’))
clsEnd[1] = cmds.rename(clsEnd[1], (ctrlEnd + ‘_end_clusterHandle’))
cmds.setAttr((cmds.listRelatives(clsTop[1], type=”shape”)[0] + ‘.originX’), topPoint)
cmds.setAttr((cmds.listRelatives(clsEnd[1], type=”shape”)[0] + ‘.originX’), endPoint)
setPivot(objects=[clsTop[1]], rotatePivot=1, scalePivot=1, pivot=(topPoint,0,0))
setPivot(objects=[clsEnd[1]], rotatePivot=1, scalePivot=1, pivot=(endPoint,0,0))
cmds.percent(clsTop[0], (deformCrv + ‘.cv[1]’), v=0.5)
cmds.percent(clsEnd[0], (deformCrv + ‘.cv[1]’), v=0.5)
posTopPma = cmds.shadingNode(‘plusMinusAverage’, asUtility=1, name = (prefix + ‘top_ctrl_pos_pma’))
cmds.connectAttr((ctrlTop + ‘.translate’), (posTopPma + ‘.input3D[0]’))
cmds.connectAttr((grpTop + ‘.translate’), (posTopPma + ‘.input3D[1]’))
posEndPma = cmds.shadingNode(‘plusMinusAverage’, asUtility=1, name = (prefix + ‘end_ctrl_pos_pma’))
cmds.connectAttr((ctrlEnd + ‘.translate’), (posEndPma + ‘.input3D[0]’))
cmds.connectAttr((grpEnd + ‘.translate’), (posEndPma + ‘.input3D[1]’))
cmds.connectAttr((posTopPma + ‘.output3D’), (clsTop[1] + ‘.translate’))
cmds.connectAttr((ctrlMid + ‘.translate’), (clsMid[1] + ‘.translate’))
cmds.connectAttr((posEndPma + ‘.output3D’), (clsEnd[1] + ‘.translate’))
#Create deformers: Blendshape
blndDef = cmds.blendShape(geoPlaneWire[0], geoPlaneTwist[0], geoPlaneSine[0], geoPlane[0], name=(prefix + ‘blendShape’),weight=[(0,1),(1,1),(2,1)])

#Twist deformer: Sum the twist and the roll
sumTopPma = cmds.shadingNode(‘plusMinusAverage’, asUtility=1, name = (prefix + ‘twist_top_sum_pma’))
cmds.connectAttr((ctrlTop + ‘.twist’), (sumTopPma + ‘.input1D[0]’))
cmds.connectAttr((ctrlTop + ‘.twistOffset’), (sumTopPma + ‘.input1D[1]’))
cmds.connectAttr((ctrlMid + ‘.roll’), (sumTopPma + ‘.input1D[2]’))
cmds.connectAttr((ctrlMid + ‘.rollOffset’), (sumTopPma + ‘.input1D[3]’))
cmds.connectAttr((sumTopPma + ‘.output1D’), (twistDef[0] + ‘.startAngle’))
sumEndPma = cmds.shadingNode(‘plusMinusAverage’, asUtility=1, name = (prefix + ‘twist_low_sum_pma’))
cmds.connectAttr((ctrlEnd + ‘.twist’), (sumEndPma + ‘.input1D[0]’))
cmds.connectAttr((ctrlEnd + ‘.twistOffset’), (sumEndPma + ‘.input1D[1]’))
cmds.connectAttr((ctrlMid + ‘.roll’), (sumEndPma + ‘.input1D[2]’))
cmds.connectAttr((ctrlMid + ‘.rollOffset’), (sumEndPma + ‘.input1D[3]’))
cmds.connectAttr((sumEndPma + ‘.output1D’), (twistDef[0] + ‘.endAngle’))
#Twist deformer: Set up the affect of the deformer
topAffMdl = cmds.shadingNode(‘multDoubleLinear’, asUtility=1, name = (prefix + ‘twist_top_affect_mdl’))
cmds.setAttr((topAffMdl + ‘.input1’), -0.1)
cmds.connectAttr((ctrlTop + ‘.affectToMid’), (topAffMdl + ‘.input2’))
cmds.connectAttr((topAffMdl + ‘.output’), (twistDef[0] + ‘.lowBound’))
endAffMdl = cmds.shadingNode(‘multDoubleLinear’, asUtility=1, name = (prefix + ‘twist_end_affect_mdl’))
cmds.setAttr((endAffMdl + ‘.input1’), 0.1)
cmds.connectAttr((ctrlEnd + ‘.affectToMid’), (endAffMdl + ‘.input2’))
cmds.connectAttr((endAffMdl + ‘.output’), (twistDef[0] + ‘.highBound’))

#Squash deformer: Set up the connections for the volume control
volumeRevfMdl = cmds.shadingNode(‘multDoubleLinear’, asUtility=1, name = (prefix + ‘volume_reverse_mdl’))
cmds.setAttr((volumeRevfMdl + ‘.input1’), -1)
cmds.connectAttr((ctrlMid + ‘.volume’), (volumeRevfMdl + ‘.input2’))
cmds.connectAttr((volumeRevfMdl + ‘.output’), (squashDef[0] + ‘.factor’))
cmds.connectAttr((ctrlMid + ‘.startDropoff’), (squashDef[0] + ‘.startSmoothness’))
cmds.connectAttr((ctrlMid + ‘.endDropoff’), (squashDef[0] + ‘.endSmoothness’))
cmds.connectAttr((ctrlMid + ‘.volumePosition’), (squashDef[1] + ‘.translateX’))
#Squash deformer: Set up the volume scaling
sumScalePma = cmds.shadingNode(‘plusMinusAverage’, asUtility=1, name = (prefix + ‘volume_scale_sum_pma’))
cmds.setAttr((sumScalePma + ‘.input1D[0]’), topPoint)
cmds.connectAttr((ctrlMid + ‘.volumeScale’), (sumScalePma + ‘.input1D[1]’))
cmds.connectAttr((sumScalePma + ‘.output1D’), (squashDef[1] + ‘.scaleY’))

#Sine deformer: Set up the connections for the sine
cmds.connectAttr((ctrlMid + ‘.amplitude’), (sineDef[0] + ‘.amplitude’))
cmds.connectAttr((ctrlMid + ‘.offset’), (sineDef[0] + ‘.offset’))
cmds.connectAttr((ctrlMid + ‘.twist’), (sineDef[1] + ‘.rotateY’))
cmds.connectAttr((ctrlMid + ‘.sineLength’), (sineDef[0] + ‘.wavelength’))

#Cleanup: Hierarchy
cmds.parent(geoPlaneWire[0], geoPlaneTwist[0], geoPlaneSine[0], geoPlaneVolume[0], grpSurfaces)
cmds.parent(twistDef[1], sineDef[1], squashDef[1], grpDeformers)
cmds.parent(clsTop[1], clsMid[1], clsEnd[1], grpCluster)
cmds.parent(grpTop, grpMid, grpEnd, grpCtrl)
cmds.parent(geoPlane[0], grpSurface)
cmds.parent(deformCrv, (cmds.listConnections(wireDef[0] + ‘.baseWire[0]’)[0]), grpMisc)
#Cleanup: Visibility
cmds.hide(grpSurfaces, grpDeformers, grpCluster, grpMisc)
for x in cmds.listConnections(ctrlMid):
cmds.setAttr((x + ‘.isHistoricallyInteresting’), 0)
for y in cmds.listConnections(x):
cmds.setAttr((y + ‘.isHistoricallyInteresting’), 0)

#Update the scale-group
scaleGrp = scaleGrp if scaleGrp else grpTransform
#Create follicles: The main-surface and the volume-surface
for x in range(0, numJoints):
#Declare a variable for the current index
num = str(x + 1)
#Get the normalized position of where to place the current follicle
uVal = ((0.5 / numJoints) * (x + 1) * 2) – ((0.5 / (numJoints * 2)) * 2)
#Create a follicle for the bind-plane and the volume-plane
follicleS = createFollicle(scaleGrp=scaleGrp, inputSurface=cmds.listRelatives(geoPlane[0], type=”shape”), uVal=uVal, name=(prefix + num + ‘_follicle’))
follicleV = createFollicle(scaleGrp=None, inputSurface=cmds.listRelatives(geoPlaneVolume[0], type=”shape”), uVal=uVal, vVal=0, name=(prefix + num + ‘_volume_follicle’))
cmds.parent(follicleS[0], grpFollMain)
cmds.parent(follicleV[0], grpFollVolume)
#Create a joint, controller and a group for the current skin-follicle
cmds.select(clear=True)
follicleJoint = cmds.joint(name=(prefix + num + ‘_jnt’), radius=0.1)
follicleCtrl = cmds.circle(name=(prefix + num + ‘_ctrl’), c=(0,0,0), nr=(1,0,0), sw=360, r=0.5, d=3, s=8, ch=0)[0]
follicleXform = cmds.group(name=(prefix + num + ‘_xform_grp’), empty=True)
cmds.parent(follicleXform, follicleS[0])
cmds.parent(follicleCtrl, follicleXform)
cmds.parent(follicleJoint, follicleCtrl)
cmds.delete(cmds.parentConstraint(follicleS[0], follicleXform))
#Set the color and connect the visibility-switch for the controller
cmds.setAttr((cmds.listRelatives(follicleCtrl, shapes=True)[0] + ‘.overrideEnabled’), 1)
cmds.setAttr((cmds.listRelatives(follicleCtrl, shapes=True)[0] + ‘.overrideColor’), 12)
cmds.connectAttr((ctrlMid + ‘.showExtraCtrl’), (cmds.listRelatives(follicleCtrl, shapes=True)[0] + ‘.visibility’))
#Make the connections for the volume
multMpd = cmds.shadingNode(‘multiplyDivide’, asUtility=1, name = (prefix + num + ‘_multiplier_mpd’))
cmds.connectAttr((ctrlMid + ‘.volumeMultiplier’), (multMpd + ‘.input1Z’))
cmds.connectAttr((follicleV[0] + ‘.translate’), (multMpd + ‘.input2’))
sumPma = cmds.shadingNode(‘plusMinusAverage’, asUtility=1, name = (prefix + num + ‘_volume_sum_pma’))
cmds.connectAttr((multMpd + ‘.outputZ’), (sumPma + ‘.input1D[0]’))
cmds.setAttr((sumPma + ‘.input1D[1]’), 1)
cmds.connectAttr((sumPma + ‘.output1D’), (follicleXform + ‘.scaleY’))
cmds.connectAttr((sumPma + ‘.output1D’), (follicleXform + ‘.scaleZ’))

jh_proceduralRibbon()

Download Script

9 comments

  1. Fabian Elmers says:

    I’m very curious about the twist extractors you talk about in your reel. I am having a hell of a time trying to make a forearm setup that can go past 180 degrees without flipping.

    Aim’s don’t work as they flip at 180.

    • Jorn says:

      Hey, yeah I’ll see if can make some time to put together at tutorial on those also. Yeah right, again, simple trick: weighted constraint :)

  2. Paul Schweizer says:

    Hey Jørn,
    Awesome stuff with your ribbon setup, and thanks for sharing!
    I executed the script but unfortunately my maya immediately crashes after I move one of the controls even a little bit.
    I am trying it on Win 8.1 with Maya 2015.
    Have you encountered this behavior before? I will further investigate, since it’s a really cool setup and I would like to use it.
    I already suspect it has something to do with the blendshapes, because up until that step, everything works fine.
    Thanks,
    Paul!

  3. Paul Schweizer says:

    It seems I solved the bug, I had to install all the service packs up to SP 5 to get it to work.
    So thanks again for the cool setup!

    • Jorn says:

      That sounds really weird, I haven’t had any problems in any versions of Maya, I actually did the tutorial on Windows 8.1 in Maya 2015 SP1. It might just be to delete the prefs folder, I’ve had all kinds of problems that has been solved by deleting that folder 😛

  4. HxC says:

    Thank you so much !
    It will be awesome if you can make a tutorial about the twist extractors !

  5. Sam S says:

    Hi,
    very nice setup, thanks for sharing.
    Can you give us some hints of how you manage the twist extracts, another chain with spline IK maybe as initial setup ?

    Best.

  6. ramiro gomez says:

    Hi Jorn,

    This is actually pretty cool. How do you handle it when your arm is not straight but slight bent at the elbow for example and you don’t want a perfectly straight ribbon, but something that contours more to your topology?

    Thanks,
    Ramiro

    • Jorn says:

      Well there’s probably several ways to do this, what comes first to mind is to just have two more controllers influencing a denser wirecurve, easy peasy :)

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