Getting the value

papawo

MBartlett21

@papawo
Do you mean in the UI?

paul_chastell

cPlane is a feature function and contains fields that will be provided to the user to allow them to specify planes through the Onshape UI in a useful way that captures relations to other objects. If you look at the source code of cPlane you will see that what gets passed to the operation opPlane is just the regular definition of a plane, the 'oppositeDirection' field is used to calculate which side of the input plane to make the new plane but is then forgotten. opPlane really doesn't care about other objects, just where the plane should go.

https://cad.onshape.com/documents/12312312345abcabcabcdeff/v/f8bab07052a79eabcbfa78d1/e/577e2aaf45a542f98d9343c7

Maybe you would like to enquire these values after creation of the plane, which isn't possible because it isn't part of the final plane definition. 

Maybe you want to know what value you should pass programmatically when creating a plane in Featurescript. The new plane, by default, is offset in the direction of the normal of the input plane and setting oppositeDirection negates the offset distance. To work out what the flag should be set to you would need to know where you want the output to be, and enquire the normal of the input plane, and if you know all that I would suggest using opPlane to create the plane instead, not cPlane. 

If neither of those answer you're question then could you be more clear about what you are trying to do?