mirroring/updating parms from L to R objects

[jim c]

What would be the best way to go about updating the parms from left to right on a rig? FOr example, lets say you've got the rig set up and done an initial mirroring of the left side. Then you make some adjustments to some bones on the left side and want to mirror these adjustments (things like bone length, txyz or rxyz) over to the right side. As far as I know there's no shelf tools that do this or any utility scripts either?

I started writing a script that does this but ran into some issues. The simple way of just globbing for nodes like "L_*" and then for each node found find the equivalent "R_" node and transfering params doesn't entirely cut it. Specifically, if on the left side you've "cleaned" or "frozen" the transform at the Parameter level (so everything is now moved to the pre-transform) how to you properly handle that on the other side?

[edward]

To handle pre-transforms, th easiest way is to get the worldTransform(), manipulate the matrix, and then call setWorldTransform() on the other node. These are HOM methods in python.

[jim c]

Thanks I think I have this sorted out now. It was easier than I thought, this is what I came up with

def getFirstInput(node):

    inputs = node.inputs()

    if not inputs is None :

        if  len(inputs) > 0 :

            return inputs[0]



    return None







mirrorVec = hou.Vector3(1,0,0)

mirrorVec = mirrorVec.normalized()

mirror = hou.Matrix4()

mirror.setToIdentity()

mirror.setAt(0,0,1.0 - (2.0 * (mirrorVec[0]*mirrorVec[0])))

mirror.setAt(1,1,1.0 - (2.0 * (mirrorVec[1]*mirrorVec[1])))

mirror.setAt(2,2,1.0 - (2.0 * (mirrorVec[2]*mirrorVec[2])))



for n in hou.selectedNodes():

    name = n.name()

    mirror_name = name.replace("L_", "R_", 1)

    parent = getFirstInput(n)

    mirrorP_name = parent.name().replace("L_", "R_", 1)

    

    mirrorP = hou.node(n.parent().path() + "/" + mirrorP_name )



    mirrorNode = hou.copyNodesTo( (n,), n.parent() )[0]

    mirrorNode.setName(mirror_name)

    m = mirrorNode.worldTransform()

    mm = m * mirror

    mirrorNode.setWorldTransform(mm)

    mirrorNode.moveParmTransformIntoPreTransform()

    mirrorNode.parm('keeppos').set(1)

    mirrorNode.setFirstInput(mirrorP)

    mirrorNode.parm('keeppos').set(0)



    v = mirrorNode.origin()

    if  v[0] > 0 :

        mirrorNode.parm("dcolorr").set(0)

        mirrorNode.parm("dcolorg").set(0)

        mirrorNode.parm("dcolorb").set(1)

        mirrorNode.setColor(hou.Color((0,0,1)))

    elif v[0] < 0 :

        mirrorNode.parm("dcolorr").set(1)

        mirrorNode.parm("dcolorg").set(0)

        mirrorNode.parm("dcolorb").set(0)

        mirrorNode.setColor(hou.Color((1,0,0)))



    mirrorNode.moveToGoodPosition()