I'm wondering if anyone knows how to do this, I've read that it is possible, using Ray Casting, but I don't know what Ray Casting is, nor have I ever scripted it.
I've tried a simple onTouch script with the mesh, to test, but it don't work, and gives an error saying Touched is not a valid member of Mesh.
By the way, I can't resize the actual part itself, because it is welded. Resizing the part breaks the weld.

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You can't touch the mesh, only the part. The mesh is sorta like a decal, or a texture, but in 3d. You can't touch decals, or textures, and you can't touch meshes.