that's the hard partmaxGfive wrote:but... let's say i remove parts on model, how do i save changes on g1m or bin?
Generally the "reverse way" requires a FULL format analysing.
If it's removing only (not changing) there's a chance to set the concerning vertices to 0.0 0.0 0.0 or set the face indices to f 1 1 1.
But you'd need to identify where the data is in the g1m file.
(Don't have the time to check that.)