How to use 3D offset finishing on multi axis with multiple surfaces ?

[hamed.desighn]

Hi , im using this model right here with the boundary as you can see using "3D offset finishing" toolpath but it seems like powermill somehow reads boundary as  a two dimensional curve rather than a 3d boundary , im so confused right now .

[jianhua.fan]

Is this because the model has undercut if you view from +z-axis, and the offset finishing strategy cannot machine it? 

[hamed.desighn]

exactly , if i see the model from z+ axis the boundary looks working in that way , one alternative approach was to rotate the workplane around X axis to math tha z axis with boundary definition but it didn't gave me accurate result also needs extra work , i didn't get under cut meaning tho is that means the model is unsewed or open ? cause the model is solid and no gaps in it .

[jianhua.fan]

undercut means part of model is hidden by other part and cannot be seen if you view from the top. 

[hamed.desighn]

What would i do then ? any help appreciated

[hamed.desighn]

Jesus christ someone please help 😥🙏

[M_Hennig]

 3d offset finishing only projects the way the work plane is orientated,  try surface projection finishing or alter your work plane so there are no undercuts.

[SupportEmail]

You could also use a line projection toolpath and trim back what you don't need.