Parts of a body not respecting collision filter

[Quitalizner]

So, I'm trying to disable collision on certain parts of a body depending upon an event. It seems that applying collisionFilter on a body part doesn't really do anything. Is this a bug or the way it is implemented.

I'm not talking about collision with parts of the same body, but with the world

        const mainBody = Bodies.rectangle(0, 0, w * 0.4, h * 0.8, {
		chamfer: { radius: w * 0.2 },
		label: 'main',
	});

	const sensors = {
		bottom: Bodies.rectangle(0, h * 0.4, w * 0.25, 10, { isSensor: true, label: 'bottom' }),
		front: Bodies.rectangle(w * 0.225, 0, 20, h * 0.5, { isSensor: true, label: 'front',  }),
		back: Bodies.rectangle(-w * 0.225, 0, 10, h * 0.5, { isSensor: true, label: 'back' }),
	};

	sensors.front.collisionFilter = {
		group: -1,
		category: -1,
		mask: 1 << 2
	}

	const compoundBody = Body.create({
		parts: [mainBody, sensors.bottom, sensors.front, sensors.back],
		frictionStatic: 0,
		frictionAir: 0.02,
		friction: 0.1,
		// The offset here allows us to control where the sprite is placed relative to the
		// matter body's x and y - here we want the sprite centered over the matter body.
		render: { sprite: { xOffset: 0.35, yOffset: 0.45 } },
	});

	this.body = compoundBody;

[liabru]

That's right currently for performance and simplicity reasons only the parent body collisionFilter is used rather than from each part, so I think you might need to use constraints to do something like this.