zbw_rig.py 文件源码

def scaleStretchIK(limbName="none", ikTop="none", ikMid="none", ikLow="none", jntMeasure="none", IKMeasure="none", IKCtrl="none", axis="none", *args):
    """creates a stretch setup for 3 joint IK chain. Inputs (strings) are the limbName, 3 ik joints (top to bottom), the measure input for the whole chain (add up from measure joints), the measure for the ikCtrl, the ik handle or ctrl (which must have 'scaleMin', 'upScale' and 'lowScale' attrs, the axis letter. Returns . . . """

    ratioMult = cmds.shadingNode("multiplyDivide", asUtility=True, n="%s_stretchRatioMult"%limbName)
    cmds.setAttr(ratioMult + ".operation", 2)
    cmds.connectAttr(jntMeasure, "%s.input2X"%ratioMult)
    cmds.connectAttr(IKMeasure, "%s.input1X"%ratioMult)

    #could put this default stuff (next two paragraphs) after the conditional and use another conditional so that minScale is bundled up in "autostretch"
    #create default setting of 1 when autostretch is off
    defaultMult = cmds.shadingNode("multiplyDivide", asUtility=True, n="%s_stretchDefaultMult"%limbName)
    cmds.setAttr("%s.input1X"%defaultMult, 1)

    #create blend node to blend ratio mult and default values, based on blender attr of ikctrl.autoStretch
    defaultBlend = cmds.shadingNode("blendColors", asUtility=True, n="%s_stretchBlend"%limbName)
    cmds.connectAttr("%s.outputX"%defaultMult, "%s.color2R"%defaultBlend)
    cmds.connectAttr("%s.outputX"%ratioMult, "%s.color1R"%defaultBlend)
    cmds.connectAttr("%s.autoStretch"%IKCtrl, "%s.blender"%defaultBlend)

    #blend goes into condition node - firstTerm, secondTerm=ikctrl scaleMin value, operation=2(greaterthan), colorIfTrue is blend, colorIfFalse is scaleMin attr
    conditional = cmds.shadingNode("condition", asUtility=True, n="%s_upStretchCondition"%limbName)
    cmds.setAttr("%s.operation"%conditional, 2)
    cmds.connectAttr("%s.outputR"%defaultBlend, "%s.firstTerm"%conditional)
    cmds.connectAttr("%s.scaleMin"%IKCtrl, "%s.secondTerm"%conditional)
    cmds.connectAttr("%s.outputR"%defaultBlend, "%s.colorIfTrueR"%conditional)
    cmds.connectAttr("%s.scaleMin"%IKCtrl, "%s.colorIfFalseR"%conditional)

    #factor in the upScale/lowScale attrs
    upScaleMult = cmds.shadingNode('multiplyDivide', asUtility=True, n="%s_upScaleMult"%limbName)
    cmds.connectAttr("%s.outColorR"%conditional, "%s.input1X"%upScaleMult)
    cmds.connectAttr("%s.upScale"%IKCtrl, "%s.input2X"%upScaleMult)
    loScaleMult = cmds.shadingNode('multiplyDivide', asUtility=True, n="%s_loScaleMult"%limbName)
    cmds.connectAttr("%s.outColorR"%conditional, "%s.input1X"%loScaleMult)
    cmds.connectAttr("%s.lowScale"%IKCtrl, "%s.input2X"%loScaleMult)

    #hook up the scales of the joints
    cmds.connectAttr("%s.outputX"%upScaleMult, "%s.s%s"%(ikTop, axis))
    cmds.connectAttr("%s.outputX"%loScaleMult, "%s.s%s"%(ikMid, axis))

    return(ratioMult, defaultMult, defaultBlend, conditional, upScaleMult, loScaleMult)