{"action":"created","issue":{"url":"https://api.github.com/repos/opensim-org/opensim-core/issues/1360","repository_url":"https://api.github.com/repos/opensim-org/opensim-core","labels_url":"https://api.github.com/repos/opensim-org/opensim-core/issues/1360/labels{/name}","comments_url":"https://api.github.com/repos/opensim-org/opensim-core/issues/1360/comments","events_url":"https://api.github.com/repos/opensim-org/opensim-core/issues/1360/events","html_url":"https://github.com/opensim-org/opensim-core/issues/1360","id":184882526,"number":1360,"title":"CMC look ahead window and path actuated model","user":{"login":"mitkof6","id":4024976,"avatar_url":"https://avatars.githubusercontent.com/u/4024976?v=3","gravatar_id":"","url":"https://api.github.com/users/mitkof6","html_url":"https://github.com/mitkof6","followers_url":"https://api.github.com/users/mitkof6/followers","following_url":"https://api.github.com/users/mitkof6/following{/other_user}","gists_url":"https://api.github.com/users/mitkof6/gists{/gist_id}","starred_url":"https://api.github.com/users/mitkof6/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mitkof6/subscriptions","organizations_url":"https://api.github.com/users/mitkof6/orgs","repos_url":"https://api.github.com/users/mitkof6/repos","events_url":"https://api.github.com/users/mitkof6/events{/privacy}","received_events_url":"https://api.github.com/users/mitkof6/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-10-24T15:59:08Z","updated_at":"2016-10-24T16:02:28Z","closed_at":null,"body":"When performing CMC with PathActuators for muscles, the default look ahead window causes instabilities, due to the fact that the PathActuators does not need a prediction. This behavior is observed when we have external forces attached (e.g. gait2354 example). The solution is to use smaller look ahead time window (e.g. 0.001). Unfortunately, this causes the simulation to be very slow. I am not sure if there is a quick fix, but by default a PathActuator should not need the time window look ahead."},"comment":{"url":"https://api.github.com/repos/opensim-org/opensim-core/issues/comments/255784325","html_url":"https://github.com/opensim-org/opensim-core/issues/1360#issuecomment-255784325","issue_url":"https://api.github.com/repos/opensim-org/opensim-core/issues/1360","id":255784325,"user":{"login":"chrisdembia","id":846001,"avatar_url":"https://avatars.githubusercontent.com/u/846001?v=3","gravatar_id":"","url":"https://api.github.com/users/chrisdembia","html_url":"https://github.com/chrisdembia","followers_url":"https://api.github.com/users/chrisdembia/followers","following_url":"https://api.github.com/users/chrisdembia/following{/other_user}","gists_url":"https://api.github.com/users/chrisdembia/gists{/gist_id}","starred_url":"https://api.github.com/users/chrisdembia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chrisdembia/subscriptions","organizations_url":"https://api.github.com/users/chrisdembia/orgs","repos_url":"https://api.github.com/users/chrisdembia/repos","events_url":"https://api.github.com/users/chrisdembia/events{/privacy}","received_events_url":"https://api.github.com/users/chrisdembia/received_events","type":"User","site_admin":false},"created_at":"2016-10-24T16:02:28Z","updated_at":"2016-10-24T16:02:28Z","body":"Interesting. To be clear, do you use any muscles in this scenario? Or *only* PathActuators?\r\n\r\n\r\nGiven that a proper fix for this would take a long time, I would say that all we can expect to do in the short term is to document this behavior (on confluence).\r\n\r\n"}}
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