Pixel Dice are a new thing on Kickstarter here. They are physical dice that, when rolled, can send the values rolled to a computer program. They have their own app, but they can also integrate with VTTs, if the VTT supports it.
This relates to the Animated Dice Rolls feature request. I suspect that the 3d dice can’t be synchronized in any way with the physical dice, but rolling the physical dice and that triggering the 3d dice would probably be neat.