topic How to select shading group in Mel? in Maya Programming Forum

How to select shading group in Mel?

malcolm_341 — Wed, 13 Sep 2023 18:39:22 GMT

Hi, today I was surprised to find out I can't store a shading group in a variable and then use that variable to select it. I created a blinn shader and manually selected it's shading group node, then I ran in the script editor

string $temp[] = `ls -sl`;

select $temp;

And that doesn't select my shading group, is there something I'm missing here?

Re: How to select shading group in Mel?

stephenkmann — Wed, 13 Sep 2023 19:32:59 GMT

Shading Groups,(SG) are sets

When you select a set (using mel/python) , it selects the items in the set by default.

( this works this way for all sets)

but ,if you want to select the set itself. you want to use the noExpand flag (-ne -noExpand )

so if you run

string $sel[] = `ls -sl`;

select -ne $sel;

but be aware that mel will return a single object from ls -sl if you have a single object. but an array , if you have multiple objects

so if you select multiple shaderGroups., you want to index the array

string $sel[] = `ls -sl`;

select -ne $sel[0];
select -ne $sel[1];

hth

-=s

Re: How to select shading group in Mel?

malcolm_341 — Thu, 14 Sep 2023 16:52:47 GMT

@stephenkmann That did the trick, thanks! I didn't know about this set workflow.