screen2dToWorld3d for Fivem !

screen2dToWorld3d.lua

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-- Original : https://rage.mp/forums/topic/1916-code-snippets/
--

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function screen2dToWorld3d(absoluteX, absoluteY) {
	var camPos = GetGameplayCamCoords()
	var rX, rY = processCoordinates(absoluteX, absoluteY)
	var target = s2w(camPos, rX, rY)

	var dir = sub(target, camPos)
	var from = add(camPos, mulNumber(dir, 0.5))
	var to = add(camPos, mulNumber(dir, 300))

	var ray = CastRayPointToPoint(from, to, undefined, 287)

	return ray === undefined ? undefined : ray.position
}

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function s2w(camPos, relX, relY) {
	var camRot = GetGameplayCamRot()
	var camForward = rotationToDirection(camRot)
	var rotUp = add(camRot, vector3(10, 0, 0))
	var rotDown = add(camRot, vector3(-10, 0, 0))
	var rotLeft = add(camRot, vector3(0, 0, -10))
	var rotRight = add(camRot, vector3(0, 0, 10))

	var camRight = sub(rotationToDirection(rotRight), rotationToDirection(rotLeft))
	var camUp = sub(rotationToDirection(rotUp), rotationToDirection(rotDown))

	var rollRad = -degToRad(camRot.y)

	var camRightRoll = sub(mulNumber(camRight, Math.cos(rollRad)), mulNumber(camUp, Math.sin(rollRad)))
	var camUpRoll = add(mulNumber(camRight, Math.sin(rollRad)), mulNumber(camUp, Math.cos(rollRad)))

	var point3D = add(
		add(
			add(camPos, mulNumber(camForward, 10.0)),
			camRightRoll
		),
		camUpRoll)

	var point2D = w2s(point3D)

	if (point2D === undefined) {
		return add(camPos, mulNumber(camForward, 10.0))
	}

	var point3DZero = add(camPos, mulNumber(camForward, 10.0))
	var point2DZero = w2s(point3DZero)

	if (point2DZero === undefined) {
		return add(camPos, mulNumber(camForward, 10.0))
	}

	var eps = 0.001

	if (math.abs(point2D.x - point2DZero.x) < eps || math.abs(point2D.y - point2DZero.y) < eps) {
		return add(camPos, mulNumber(camForward, 10.0))
	}

	var scaleX = (relX - point2DZero.x) / (point2D.x - point2DZero.x)
	var scaleY = (relY - point2DZero.y) / (point2D.y - point2DZero.y)
	var point3Dret = add(
		add(
			add(camPos, mulNumber(camForward, 10.0)),
			mulNumber(camRightRoll, scaleX)
		),
		mulNumber(camUpRoll, scaleY))

	return point3Dret
}

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function processCoordinates(x, y) {
	var screenX, screenY = GetActiveScreenResolution()

	let relativeX = (1 - ((x / screenX) * 1.0) * 2)
	let relativeY = (1 - ((y / screenY) * 1.0) * 2)

	if (relativeX > 0.0) {
		relativeX = -relativeX
	} else {
		relativeX = math.abs(relativeX)
	}

	if (relativeY > 0.0) {
		relativeY = -relativeY
	} else {
		relativeY = math.abs(relativeY)
	}

	return relativeX, relativeY
}

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function w2s(position) {
	var result = World3dToScreen2d(position.x, position.y, position.z)
	if (result === nil) {
		return nil
	}
	return vector3((result.x - 0.5) * 2, (result.y - 0.5) * 2, 0)
}

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function rotationToDirection(rotation) {
	var z = degToRad(rotation.z)
	var x = degToRad(rotation.x)
	var num = math.abs(Math.cos(x))
	return vector3((-Math.sin(z) * num), (Math.cos(z) * num), Math.sin(x))
}

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function degToRad(deg) {
	return deg * Math.PI / 180.0
}

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function add(vector1, vector2) {
	return vector3(vector1.x + vector2.x, vector1.y + vector2.y, vector1.z + vector2.z)
}

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function sub(vector1, vector2) {
	return vector3(vector1.x - vector2.x, vector1.y - vector2.y, vector1.z - vector2.z)
}

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function mulNumber(vector1, value) {
	return vector3(vector1.x * value, vector1.y * value, vector1.z * value)
}