you can get rid of all the matrix part by setting directly the matrix in
world space, using
cmds.xform(obj, matrix=your_mat, worldSpace=True)
Le lundi 15 février 2021 à 02:42:49 UTC-5, Marcus Ottosson a écrit :
> If I understand you correctly:
>
> 1. You’ve got a dictionary of worldMatrices associated to names of
> controls
> 2. They are unordered, e.g. could be pinky and then shoulder.
> 3. You’d like these assigned to their associated control
>
> If so, then what you’re looking for isn’t evaluation order per-se, but
> hierarchical order. By assigning to shoulder first, you change where pinky
> is. So what you need to do is assign your worldMatrices in the order they
> are parented.
>
> from maya import cmdsfrom maya.api import OpenMaya as omimport math # degrees
> # Make something to export and import, you'll already have these
> shoulder, _ = cmds.polyCube()
> shoulder = cmds.rename(shoulder, "shoulder")
> cmds.move(1, 3, 6)
> cmds.rotate(15)
> pinky, _ = cmds.polyCube()
> pinky = cmds.rename(pinky, "pinky")
> cmds.parent(pinky, shoulder)
> cmds.move(0, 5, 0)
> cmds.rotate(45, 20)
> # Next, serialise them. You'll have these too
> matrices = {
> "pinky": cmds.getAttr("pinky.worldMatrix[0]"),
> "shoulder": cmds.getAttr("shoulder.worldMatrix[0]"),
> }
> # Now, anything below will restore the above to their original world matrix
> transformations
> selected_root = cmds.ls(selection=True)[0]
> hierarchy = cmds.listRelatives(selected_root, allDescendents=True)
> hierarchy += [selected_root] # This one isn't included in the above
> # allDescendents returns not only transforms, but shapes too. We don't need
> those
> hierarchy = cmds.ls(hierarchy, type="transform")
> # allDescendents returns the order reversed
> hierarchy.reverse()
> for control in hierarchy:
> matrix = matrices.get(control)
>
> # If there's something in the hierarchy not present in your list of
> matrices, that's fine
> if not matrix:
> continue
>
> # A world matrix can't be applied directly, because every control is
> relative their parent
> # So we'll convert world to local by multiplying it with the parent
> inverse matrix
> parent_inverse_matrix = cmds.getAttr(control + ".parentInverseMatrix[0]")
>
> # To multiply, we need to call on the API
> matrix = om.MMatrix(matrix)
> parent_inverse_matrix = om.MMatrix(parent_inverse_matrix)
> local_matrix = matrix * parent_inverse_matrix
>
> # Next we need translate/rotate/scale from this matrix
> local_matrix = om.MTransformationMatrix(local_matrix)
> translate = local_matrix.translation(om.MSpace.kTransform)
> rotate = local_matrix.rotation()
> scale = local_matrix.scale(om.MSpace.kTransform)
>
> # API rotations are in radians
> rotate = [math.degrees(r) for r in rotate]
>
> # Now we're got the local values ready to apply
> cmds.setAttr(control + ".translate", *translate)
> cmds.setAttr(control + ".rotate", *rotate)
> cmds.setAttr(control + ".scale", *scale)
>
> [image: applymatrices]
>
>
> On Sun, 14 Feb 2021 at 22:50, Eric Bates <backwhe...@gmail.com> wrote:
>
>> Hi all,
>>
>> Really great group you guys have here! Some awesome stuff :)
>>
>> I'm looking for some advice about a posing script I'm working on. Thanks
>> for any ideas!
>>
>> I have world space matrices that represent control positions on a rig,
>> lots of them. My goal is to snap all of the rig controls to these points.
>>
>> Unfortunately, since I don't know the evaluation order ahead of time,
>> when the positions are aligned out of order, things get ugly!
>>
>> This terrifying pose should look like a hand, the locators above show the
>> "correct" points.
>>
>> [image: Screenshot 2021-02-14 234510.png]
>> I was thinking that if there was a way to lookup the evaluation order of
>> nodes, that took into account hierarchy, constraints, etc, it would solve
>> the problem. But so far, I havent had much luck.
>>
>> Of if there is another approach out there, Id love to hear.
>>
>> Thanks for your thoughts everyone!
>>
>> Eric
>>
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