Commands and scripts: exists

The exists command returns true if the argument is a valid command, subroutine, or script.

if (exists("sphere")) {

	sphere; // make a sphere

}

objects: objExists

The objExists function returns true when an object exists with a certain name:

sphere -name "george";

// Result: george makeNurbSphere1 //

print(objExists("george"));

1

print(objExists("martha"));

0

attributes on nodes: attributeExists

Use attributeExists to check whether a given attribute exists on a node. The command has the form:

attributeExists("attributeName","nodeName")

For example:

if (attributeExists("visibility","mySphere")) {

	setAttr mySphere.visibility on;

}