PUBLISHED: August 15, 2019
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Querying the Illuminates by Default attribute in Maya
Finding lights in Autodesk Maya that have the “Illuminates by Default” attribute on/off can be a tricky because we are not querying normal attributes but instead a connection between nodes. Here is a MEL procedure that allows us to select lights that have the flag enabled or disabled.
Example
proc selectIlluminatesByDefault(int $mode) {
select -clear;
string $lights[] = `ls -dag -lights`;
for ($light in $lights) {
string $transforms[] = `listRelatives -parent $light`;
string $connections[] = `listConnections $transforms[0]`;
string $inst = $transforms[0] + ".instObjGroups";
string $dfs[] = `connectionInfo -dfs ( $inst )`;
int $isConnected = 0;
if (objExists($dfs[0] ) && `isConnected $inst $dfs[0]`) {
$isConnected = 1;
}
if ($mode == 1) {
if ($isConnected) {
select -add $light;
}
}
else {
if (!$isConnected) {
select -add $light;
}
}
}
}Usage
selectIlluminatesByDefault(0) // 0 for off and 1 for on
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