How to get section/submesh position in shader.

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How to get mesh's section/sub-mesh position in material?

Hi, We have a humanoid skeleton mesh, and we’re making a material for the “eye” section(or called sub-mesh?), in which we need to get the eye’s world position to achieve a specific effect. But the ActorPositionWS returns the skeleton mesh actor’s position, and the ObjectPositionWS returns the whole skeleton’s primitives’ bounds center instead of the eye itself (including body, head, etc). I know there’s a walkaround by using blueprint to get the eye’s bone position and set the param on materi…