https://forums.autodesk.com/t5/fusion-design-validate-document/sketch-visibility-curve-intersection-issue/m-p/5773152#M288587 <P>Hehe, there's definitely a lot of stuff to get&nbsp;acquainted with in Fusion, but it looks like you're well on your way!&nbsp; Regarding the error, you need to create a new sketch (since is 3D geometry can define this sketch anywhere, doesn't matter) in which this intersection curve will be created.&nbsp; It cannot be the same sketch that&nbsp;contains a 2D curve that you want to create the intersection curve from.&nbsp; I'm not sure why Fusion allowed you to do this, as it should have told you beforehand it's not allowed.&nbsp;</P><P>&nbsp;</P><P>Be sure to post if you have any more trouble.</P><P>&nbsp;</P><P>Jesse</P> Sun, 16 Aug 2015 14:33:48 GMT Anonymous 2015-08-16T14:33:48Z