[{"data":1,"prerenderedAt":149},["ShallowReactive",2],{"project-20014490":3},{"id":4,"name":5,"line":6,"line_source":7,"title":8,"url":9,"domain":10,"maker":11,"posted_at":12,"year":13,"points":14,"comments":15,"rank_in_year":16,"shown_in_year":17,"top":18,"tier":19,"category":20,"subcategory":21,"format":20,"keywords":22,"reception":26,"sentiment":27,"stance_mix":28,"scored_comments":30,"aspects":31,"strip":33,"post_text":27,"what":35,"said":53,"maker_in_thread":79,"shape":86,"grid":90,"attempts":105,"same_week":113,"maker_shows":80,"maker_hidden":142,"reader_version":143,"card":144},"20014490","Chordata","The motion capture system that you can build yourself","title","Show HN: Chordata – The motion capture system that you can build yourself","https:\u002F\u002Fchordata.cc\u002F","chordata.cc","daylankifky",1558872699,2019,16,17,1342,2195,62,"shown","hardware","motion capture",[21,23,24,25],"sensor fusion","open source mocap","imu sensors","quiet",null,{"positive":29,"neutral":30,"mixed":29,"critical":29},0,1,{"execution":32},{"positive":29,"critical":29},[34,29,29,29,29,29,29],3,{"problem":36,"audience":27,"pricing":27,"motivation":27,"time_to_build":27,"stack":44,"openness":52,"stage":52,"team_size":52},{"value":37,"source":38,"evidence":39},"Affordable motion capture for animation and similar uses","inferred",[40],{"id":41,"by":42,"text":43},"20017413","detaro","Cool project, cheap mocap is a quite an interesting field. I would have expected a system based purely on such sensors would start to drift and accumulate errors over time. Are…",[45],{"value":46,"source":47,"evidence":48},"Madgwick sensor fusion algorithm","maker",[49],{"id":50,"by":11,"text":51},"20017701","Thanks! It is not a trick, it's what's called a Sensor fusion algorithm. They come in many flavors, we currently implement Madgwick's one. Another popular and somehow more robust…","unknown",{"praise":54,"objections":60,"requests":65,"questions":66,"alternatives":71},[55],{"value":56,"source":57,"evidence":58},"Cheap mocap is an interesting field","commenter",[59],{"id":41,"by":42,"text":43},[61],{"value":62,"source":57,"evidence":63},"Sensor-based systems may drift and accumulate errors over time",[64],{"id":41,"by":42,"text":43},[],[67],{"value":68,"source":57,"evidence":69},"How is drift compensated?",[70],{"id":41,"by":42,"text":43},[72],{"value":73,"source":57,"evidence":74},"Xbox Kinect with open source libraries",[75],{"id":76,"by":77,"text":78},"20027558","diveanon","The facial mocap system we used for the short thanos scene in the first avengers was an Xbox Kinect and some open source libraries.",{"comments":80,"answered":30,"key":81},2,[82,83],{"id":50,"text":51},{"id":84,"text":85},"20029591","So you were on the production of the first avengers movie? Something like the kinect can be very powerful for facial tracking. But monocular optical techniques tend to give poor…",{"commenters":87,"max_depth":34,"maker_replies":80,"first_comment_mins":88,"lifespan_hours":89},4,518,64,[91,93,94,97,99,100,102],[41,29,34,92,42,29],"project\u002Fneutral\u002Fexecution",[50,29,29,92,11,30],[95,29,29,96,42,29],"20017732","commenter\u002Fneutral\u002Fnone",[76,30,29,98,77,29],"other\u002Fneutral\u002Fnone",[84,30,29,98,11,30],[101,30,29,98,77,29],"20029717",[103,30,29,98,104,29],"20036699","erklik",[106,107,110],{"id":4,"t":12,"points":14,"comments":15},{"id":108,"t":109,"points":30,"comments":29},"23669627",1593359891,{"id":111,"t":112,"points":30,"comments":29},"23760686",1594138472,[114,119,124,128,133,137],{"id":115,"name":116,"points":117,"category":118},"20012687","nextdns.io",372,"infrastructure",{"id":120,"name":121,"points":122,"category":123},"20008466","tiptap",278,"dev_tools",{"id":125,"name":126,"points":127,"category":123},"20033728","Endoflife.date",248,{"id":129,"name":130,"points":131,"category":132},"20001339","Workstation",206,"consumer_social",{"id":134,"name":135,"points":136,"category":123},"20019877","youtube-dl-interactive",196,{"id":138,"name":139,"points":140,"category":141},"20024448","Imgsquash",178,"creative",false,"v2",{"id":145,"name":5,"line":6,"ai":142,"cat":20,"year":13,"points":14,"comments":15,"rec":26,"s":27,"top":18,"kw":146,"maker":11,"domain":10,"tier":19,"attempts":34,"strip":147,"url":9,"mix":148,"praise":56,"objection":62,"sub":21},20014490,[21,23,24,25],"3000000",[29,30,29,29],1794036577893]