Hi,
Thank you for your feedback. As you’ve correctly pointed out, using the combination of the Selector Operator and the Material Operator - where the range can be returned by an Arithmetic Operator using return XSplineMatID; - is the recommended setup. To make managing this setup easier, I’ve created a macro (splineMaterialID.rcm) for you, which is attached to this email.
We’ll review possibilities for enhancing this functionality in future versions.
Best regards,