Is possible disable Skinned Mesh shadows on a certain material?

Questions
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1

Hi, I have a SkinnedMesh character (loaded whit MMDloader) which has an array of multiple “MeshToonMaterials”, one of those materials are a transparent glasses but the glasses also produce shadows. So I wondering if there are a way to disable shadows for this material.

I tried something like:

character.material[11].castShadow=false;
character.material[11].receiveShadow=false;

but it didnt work

any help will be apreciate