MEL How-To #69
How do I change a Material's type - from Lambert to Blinn, for example - using MEL?
The drop-down menu in the Attribute Editor looks deceptively simple. By appearances it is simply switching a Material attribute from "Lambert" to "Blinn", or some such.
In reality, what's happening when you change the shading type is that Maya creates a brand new Material node of a different type, and uses the magic command replaceNode to match it to the original. This all happens from the Attribute Editor template script:
The replaceNode command (implemented via a MEL script) can be found here:
Here are the commands to do it yourself:
// This would be your existing Lambert Material string $shaderNode = "myLambert"; // This would be the desired Material type string $replaceType = "blinn"; string $replaceWith = `createNode $replaceType`; replaceNode $shaderNode $replaceWith; // Not strictly necessary... showEditor $replaceWith; delete $shaderNode; // Rename the new node to match the original. rename $replaceWith $shaderNode;
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