Flippers You Can Actually Hit With

The ball drains every time and there is nothing you can do about it. Two bats at the bottom of the playfield fix that — except that the first version of every flipper anyone writes has a maddening bug. Most swings work. Then, every so often, you swing hard at a ball and it passes clean through the bat as though the bat weren't there. No bounce, no sound, straight down the drain.

That is arithmetic, not a physics engine bug.

Add the two flippers

"Flipper_Left": {
  "tags": ["flipper", "flipper-left"],
  "components": {
    "MeshPrimitive": {
      "primitive": "box", "width": 2.4, "height": 0.4, "depth": 0.6,
      "position": [-3, 0.3, 15.1],
      "material": { "diffuseColor": [0.85, 0.85, 0.95], "emissiveColor": [0.1, 0.1, 0.2] }
    },
    "Shadow": { "castShadow": true, "receiveShadow": true },
    "Physics": {
      "shapeType": "box", "motionType": "kinematic",
      "mass": 1, "restitution": 0.4, "friction": 0.1, "autoCreate": false
    },
    "Flipper": {
      "restAngle": -0.555, "flipAngle": 0.5,
      "flipSpeed": 24, "returnSpeed": 12,
      "triggerKey": "ShiftLeft",
      "taperedGeometry": true, "length": 2.4, "direction": "left",
      "colliderInflate": { "y": 0.1, "z": 0.5 }
    },
    "PinballLayout": { "xCoeff": -0.1875, "zCoeff": 0.5, "zOffset": -1.5 }
  }
}

Flipper_Right is the mirror: xCoeff: 0.1875, restAngle: 0.555, flipAngle: -0.5, direction: "right", triggerKey: "ShiftRight", everything else identical. Both carry PinballLayout, so the bats travel with the table like the walls do — zCoeff: 0.5 with a zOffset: -1.5 parks them a fixed unit and a half above the bottom edge at any depth.

That restAngle: -0.555 matches Wall_BottomLeft, which has rotation: [0, -0.555, 0]. A resting flipper lies exactly parallel to the rail above it, so the two form one continuous funnel into the drain — until you lift the bat out of line.

Two settings in that block have no obvious business being there: autoCreate: false on the body, and colliderInflate on the flipper. Both serve the collider.