An　n-order　marker　field　is　a　special　binary　matrix　whose　n×n　subregions　are　all　distinct　from　each　other　in　four　orientations.　It　is　commonly　used　to　guide　the　composing　process　of　position-sensing　markers,　which　can　be　detected　and　identified　in　a　camera　image　with　very　limited　scope　or　severe　visibility　problems.　Despite　the　advantages,　position-sensing　markers　are　rare　and　overlooked　because　generating　marker　fields　is　difficult.　In　this　article,　we　broaden　the　definition　of　marker　field,　making　it　more　powerful　and　flexible.　Then,　we　propose　bWFC　(binary　wave　function　collapse)　and　its　high-speed　version,　fast-bWFC,　to　solve　the　generation　problem.　The　methods　are　packaged　into　an　open-sourced　toolkit　named　HydraMarker,　with　which,　users　not　only　can　generate　marker　fields　on　laptops　within　a　short　period　of　time,　but　also　can　highly　customize　them:　preset　values;　fields　and　subregions　in　any　shape;　multifold　local　uniqueness.　Comparative　results　indicate　that　the　proposed　method　has　superior　efficiency,　quality,　and　capability.　It　makes　marker　field　generation　accessible　to　common　marker　designers,　opening　up　more　possibilities　for　fiducial　markers.　©　1979-2012　IEEE.