Update Towbar Height

42.13/media/lua/client/TowBar/TowingUtils.lua

@@ -8,6 +8,21 @@ TowBarMod.Utils.tempVector2 = Vector3f.new()
 --- Util functions
 ---------------------------------------------------------------------------
 
+--- Compute the attachment Y offset for a vehicle so the towbar sits just
+--- above the wheels (i.e. a fixed distance off the ground) regardless of
+--- how the vehicle model is configured.
+local function computeAttachmentHeight(vehicle)
+	local script = vehicle:getScript()
+	if not script then return -0.5 end
+
+	local wheelCount = script:getWheelCount()
+	if wheelCount > 0 then
+		return script:getWheel(0):getOffset():y() + 0.1
+	end
+
+	return -0.5
+end
+
 function TowBarMod.Utils.isTrailer(vehicle)
 	return string.match(string.lower(vehicle:getScript():getName()), "trailer")
 end
@@ -88,6 +103,19 @@ function TowBarMod.Utils.updateAttachmentsForRigidTow(towingVehicle, towedVehicl
 	towedAttachment:setUpdateConstraint(false)
 	towedAttachment:setZOffset(0)
 
+	-- Dynamic height: compute Y from wheel offset so the towbar never clips the floor.
+	local towingHeight = computeAttachmentHeight(towingVehicle)
+	local towedHeight  = computeAttachmentHeight(towedVehicle)
+
+	-- Store and update the towing vehicle's attachment Y.
+	local towingModData = towingVehicle:getModData()
+	if towingModData["towBarOriginalTowingOffsetY"] == nil then
+		towingModData["towBarOriginalTowingOffsetY"] = towingAttachment:getOffset():y()
+		towingModData["towBarOriginalTowingAttachmentId"] = attachmentA
+	end
+	local towingOffset = towingAttachment:getOffset()
+	towingAttachment:getOffset():set(towingOffset:x(), towingHeight, towingOffset:z())
+
 	local towedModData = towedVehicle:getModData()
 	local spacingDistance = 1.0
 	if TowBarMod.Config and tonumber(TowBarMod.Config.rigidTowbarDistance) ~= nil then
@@ -114,22 +142,35 @@ function TowBarMod.Utils.updateAttachmentsForRigidTow(towingVehicle, towedVehicl
 
 	local zDirection = baseZ >= 0 and 1 or -1
 	local zShift = zDirection * spacingDistance
-	towedAttachment:getOffset():set(baseX, baseY, baseZ + zShift)
+	towedAttachment:getOffset():set(baseX, towedHeight, baseZ + zShift)
 
 	towedModData["isChangedTowedAttachment"] = true
 	towedModData["towBarChangedAttachmentId"] = attachmentB
 	towedModData["towBarChangedOffsetZShift"] = zShift
 	towedVehicle:transmitModData()
+	towingVehicle:transmitModData()
 end
 
 function TowBarMod.Utils.updateAttachmentsOnDefaultValues(towingVehicle, towedVehicle)
-	local towingAttachmentId = towingVehicle:getTowAttachmentSelf()
+	local towingModData = towingVehicle:getModData()
+	local towingAttachmentId = towingModData["towBarOriginalTowingAttachmentId"]
+		or towingVehicle:getTowAttachmentSelf()
 	local towingAttachment = towingVehicle:getScript():getAttachmentById(towingAttachmentId)
 	if towingAttachment ~= nil then
 		towingAttachment:setUpdateConstraint(true)
 		local zOffset = (towingAttachmentId == "trailer") and -1 or 1
 		towingAttachment:setZOffset(zOffset)
+
+		-- Restore the original Y offset that was overridden by dynamic height.
+		local originalY = tonumber(towingModData["towBarOriginalTowingOffsetY"])
+		if originalY ~= nil then
+			local off = towingAttachment:getOffset()
+			towingAttachment:getOffset():set(off:x(), originalY, off:z())
 		end
+	end
+	towingModData["towBarOriginalTowingOffsetY"] = nil
+	towingModData["towBarOriginalTowingAttachmentId"] = nil
+	towingVehicle:transmitModData()
 
 	local towedModData = towedVehicle:getModData()
 	local changedAttachmentId = towedModData["towBarChangedAttachmentId"] or towedVehicle:getTowAttachmentSelf()