{"action":"opened","issue":{"url":"https://api.github.com/repos/libigl/libigl/issues/232","repository_url":"https://api.github.com/repos/libigl/libigl","labels_url":"https://api.github.com/repos/libigl/libigl/issues/232/labels{/name}","comments_url":"https://api.github.com/repos/libigl/libigl/issues/232/comments","events_url":"https://api.github.com/repos/libigl/libigl/issues/232/events","html_url":"https://github.com/libigl/libigl/issues/232","id":139295450,"number":232,"title":"understanding gaussian curvature results","user":{"login":"jochemspek","id":377154,"avatar_url":"https://avatars.githubusercontent.com/u/377154?v=3","gravatar_id":"","url":"https://api.github.com/users/jochemspek","html_url":"https://github.com/jochemspek","followers_url":"https://api.github.com/users/jochemspek/followers","following_url":"https://api.github.com/users/jochemspek/following{/other_user}","gists_url":"https://api.github.com/users/jochemspek/gists{/gist_id}","starred_url":"https://api.github.com/users/jochemspek/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jochemspek/subscriptions","organizations_url":"https://api.github.com/users/jochemspek/orgs","repos_url":"https://api.github.com/users/jochemspek/repos","events_url":"https://api.github.com/users/jochemspek/events{/privacy}","received_events_url":"https://api.github.com/users/jochemspek/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-03-08T14:44:52Z","updated_at":"2016-03-08T14:44:52Z","closed_at":null,"body":"hi,\r\n\r\nI'm still having trouble understanding the results of the gaussian curvature calculation. the results for a simple \"bottle\" like shape (see pics) render as expected, with the red areas representing negative curvature, but the actual values are not what I expected. I would expect the vertices at the bottom of the \"bottle\" to have positive curvature (ie spherical), but the values show that all vertices have negative curvature:\r\n\r\ncould anyone shed some light on this ? \r\n\r\nthanks,\r\n\r\nJonathan\r\n\r\n0: -3.14159\r\n1: -3.21939\r\n2: -3.14159\r\n3: -3.21939\r\n4: -9.34698\r\n5: -3.14159\r\n6: -9.34698\r\n7: -3.14159\r\n8: -9.34698\r\n9: -3.14159\r\n10: -9.34698\r\n11: -3.14159\r\n12: -3.14159\r\n13: -3.21939\r\n14: -3.14159\r\n15: -3.21939\r\n\r\n<img width=\"305\" alt=\"screen shot 2016-03-08 at 15 36 22\" src=\"https://cloud.githubusercontent.com/assets/377154/13604560/9f796166-e543-11e5-9cd5-4ce42c7e2f48.png\">\r\n\r\n![screen shot 2016-03-08 at 15 36 41](https://cloud.githubusercontent.com/assets/377154/13604562/a3c79a08-e543-11e5-9a58-8b703da23950.png)\r\n"}}