find any kind of node in Maya

Sometimes, you need to know which nodes of a particular type exist, because you want to do something to all nodes of type X, and you'd like to script that, because you, like me, can't be bothered to do it all by hand. Yes, I believe laziness is a virtue :) Often, you can make these kinds of changes in the Attribute Spreadsheet, but sometimes you just can't. Changing the location of a file texture for example is not possible in the Attribute spreadsheet.

In many cases, it's really quite simple, and here's an example that turns of vertex display on all meshes (something that does show up in the Attribute Spreadsheet, but I'm too lazy to go look for it).

string $meshes[] = `ls -typ "mesh"`;
string $tmp;
for ($tmp in $meshes) {
setAttr ($tmp + ".displayVertices") 0;
}

Here's something that I use a lot when I have to render a scene that a customer sent me without all the file textures. I get a list of all nodes of the type file and then do something to them, like set all their names to the same texture so that the scene will render without missing texture errors. I know that the nodeType I'm looking for is file because it says so in the Attribute Editor, simple enough. Or I could use the nodeType command.

Replacing all file textures looks like this:

string $fileNodes[] = `ls -typ "file"`;
string $tmp;
for ($tmp in $fileNodes) {
setAttr -type "string" ($tmp + ".fileTextureName") "myTexture1.iff";
}



This is all simple enough. You can do the same thing for any kind of node.

But what if you want to do something to all mental ray materials, who all have different nodeTypes? Should you list them all and then go over each individual type? That almost feels like doing it by hand again, and that's precisely what I didn't want to do.

I'll use a feature that's not very widely used as far as I know: lsThroughFilter in stead of ls -type. Before I can use lsThroughFilter, I have to set up a filter first. A filter is a node, but it does not get saved with the scene. You can select them and see their attributes in the Attribute Editor.

Heres how to create one for all mental ray materials.

string $renderFilter = `createNode objectRenderFilter`;
setAttr -type "string" ( $renderFilter + ".annotation") "mental ray Materials";
addAttr -ln "nodeClassification"  -dt "string" $renderFilter;
setAttr -e-keyable true ($renderFilter+ ".nodeClassification");
setAttr -type "string" ( $renderFilter + ".nodeClassification") ",rendernode/mentalray/material";
print `lsThroughFilter -na $renderFilter -sort byName -reverse false`;

If you want to know what other types exist, take a look at objectNameFilter, objectAttrFilter, objectScriptFilter, objectMultiFilter, objectRenderFilter, objectTypeFilter, objectBinFilter, selectionListOperator

Take care,

Michiel Duvekot

Comments

[Alexander Morano]

AWesome. How do you filter for user created custom nodes via the API.

All you can filter for are the sub-types that the node inherited from:

kPluginLocatorNode

Which still returns ALL plugin locator nodes. How do you discretely only find "my" nodes. The only thing I have seen is some form of RTTI which breaks the idea behind MFn* classes no?

Just curious how this is solved in the wild.

[rkindusrows]

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