How to clear out (set to 0) the rotation of a joint in Maya
Reset the "rotate" attribute of a Maya joint without changing its "Joint Orient" attribute or its world position - 04/2023 - #Jumble
You have two options to set the rotation x,y and z of a joint to zero (without affecting the world position of the rest of the joint hierarchy):
- - Freeze the joint (Menu:
Modify->Freeze Transformation), but this will bake in / set the "Joint Orientation" values. - - Unparent its direct child (select child Shift + P) set the rotation values to zero and re-parent it (select child then parent while pressing Shift then press P), this will change the translation values of the child but
Joint Orientationwill stay untouched
Here is a script to automatically reset the rotation of every joints inside a skeleton hierarchy without affecting the Joint Orient attributes (this will modify translation values but joint position will stay the same relative to the world)
/*
- Select root joint and call:
source "clear_rotations.mel";
ROD_clear_rotation();
This will clear joint rotations. (joint orient stay the same though)
*/
global proc ROD_clear_rotation()
{
string $selected_joints[] = get_selected_joints();
if( size($selected_joints) != 1){
print("Selected the root joint");
return;
}
string $root_joint = get_root_of_type($selected_joints[0], "joint");
string $all_joints[] = `listRelatives -allDescendents -type "joint" $root_joint`;
string $list_parents[] = {};
for($joint in $all_joints){
push_s($list_parents, get_parent($joint));
}
int $acc = 0;
for($joint in $all_joints){
if($list_parents[$acc] != "")
parent -world $joint;
$acc += 1;
}
$acc = 0;
for($joint in $all_joints){
if($list_parents[$acc] != "")
xform -absolute -rotation 0 0 0 $joint;
$acc += 1;
}
$acc = 0;
for($joint in $all_joints){
if($list_parents[$acc] != "")
parent $joint $list_parents[$acc];
$acc += 1;
}
}
global proc string get_shape( string $xform )
{
string $shape;
if ( "transform" == `nodeType $xform` ) {
string $parents[] = `listRelatives -fullPath -shapes $xform`;
if( size($parents) > 0) {
$shape = $parents[0];
}
} else {
// Assume it's already a shape;
$shape = $xform;
}
return $shape;
}
// -----------------------------------------------------------------------------
global proc string[] get_shapes( string $xform[] )
{
string $shapes[];
for ($node in $xform) {
$shapes[size($shapes)] = get_shape($node);
}
return $shapes;
}
// -----------------------------------------------------------------------------
proc string[] filter_by_type( string $type, string $objects[] )
{
string $new_list[];
for ($node in $objects) {
if( $node != ""){
if( nodeType( $node ) == $type ){
$new_list[size($new_list)] = $node;
}
}
}
return $new_list;
}
// -----------------------------------------------------------------------------
/// @return highest dag node above '$node' and of type '$type'
proc string get_root_of_type(string $node, string $type)
{
string $longname[] = ls("-l", $node);
string $tokens[];
tokenize($longname[0], "|", $tokens);
string $list[] = filter_by_type($type, $tokens);
if( size($list) > 0 )
return $list[0];
else
return "";
}
// -----------------------------------------------------------------------------
proc string get_parent( string $node)
{
string $parent[] = `listRelatives -parent $node`;
if( size($parent) ) {
return $parent[0];
} else {
return "";
}
}
// -----------------------------------------------------------------------------
proc push_s(string $array[], string $elt){ $array[ size($array) ] = $elt; }
/// Add '$elt' only if it doesn't exist in '$array'
global proc push_unique_s(string $array[], string $elt){ if( !exists_s( $array, $elt ) ){ push_s($array, $elt); } }
/// @true if '$elt' is present in '$array'
global proc int exists_s(string $array[], string $elt) { return stringArrayContains($elt, $array); }
// -----------------------------------------------------------------------------
proc string[] get_selected_joints()
{
string $sel[] = `ls -selection -objectsOnly -long`;
$sel = get_shapes($sel);
string $list[];
for( $i = 0; $i < size($sel); $i++ ){
// Notice we reverse the order to garantee the active selection
// comes first in the list
push_unique_s($list, $sel[size($sel)-1-$i]);
}
return filter_by_type("joint", $list);
}
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