i need to create transformation matrix between two different coordinate system of two program how i can start with that ?
Can you be more precise with your question ? maybe an example workflow ? the context of the workflow you re searching (gis, architecture, engineering … ?)
If you just need some transformations (before export ?)
here you find most commands:
rhino help, transform objects
a very powerful command is _remapCplane
https://docs.mcneel.com/rhino/7/help/en-us/index.htm#commands/remapcplane.htm
you want to combine with _namedCPlanes
if you re on the developer side - check out Transform structure which holds a transformation matrix
Hello- Rhino,Geometry.Transform.ChangeBasis() ought to do it.
https://developer.rhino3d.com/api/RhinoCommon/html/Overload_Rhino_Geometry_Transform_ChangeBasis.htm
-Pascal