How to cast a shadow on an invisible or transparent part?

I’d like the player to cast shadows on a neon-material floor. Is this possible?

I’ve tried creating a transparent part over the floor and playing with it’s material and transparency settings but it doesn’t work.

For clarity, I’m not trying to make an invisible part cast a shadow.

Its just not possible. Neon parts glow, so it blocks the character shadow, also neon parts weren’t ment for shadows to be casted on.

Thanks, that’s what I suspected. I was hoping to find some kind of workaround or hack that involves putting another part / material on top of the neon material part.