-- Replace only MTK's tracer UI callback. Its physics, hits, ammunition and
-- VisualProjectilePC lifecycle stay owned by the original mod.
local legacy, replacement
local function install()
    local bridge = MTKViewpointProjectiles
    if not bridge or not VisualProjectilePC then return end
    if not bridge.bind(VisualProjectilePC.removeByID, VisualProjectilePC.list) then
        print("[MTKViewpointTurrets] MTK projectile API differs; original drawing retained.")
        return
    end
    if replacement then return end
    legacy = bridge.legacyRenderer()
    if not legacy then
        print("[MTKViewpointTurrets] MTK tracer callback not identified; original drawing retained.")
        return
    end
    replacement = function()
        if not MTKViewpointCamera or not MTKViewpointCamera.enabled() then return legacy() end
    end
    Events.OnPreUIDraw.Remove(legacy)
    Events.OnPreUIDraw.Add(replacement)
    print("[MTKViewpointTurrets] 3D projectile renderer registered; isometric tracers retained in iso view.")
end
Events.OnGameBoot.Add(install)
Events.OnGameStart.Add(install)