updated CHANGELOG and docstrings

Author: spyke7

CHANGELOG

@@ -13,11 +13,17 @@ The rules for this file:
   * accompany each entry with github issue/PR number (Issue #xyz)
 
 -------------------------------------------------------------------------------
-??/??/???? orbeckst
+??/??/???? orbeckst, spyke7
 
  * 1.1.1
 
- Fixes
+  Changes
+
+  * `from_grid()` and `native` functions are added inside mrc and OpenDX,
+    which is used by `Grid._export_<FORMAT>` and a new `convert_to()` is added
+    (issue #161, PR #164)
+
+  Fixes
 
 
 01/22/2026 IAlibay, ollyfutur, conradolandia, orbeckst, PlethoraChutney,

gridData/OpenDX.py

@@ -525,6 +525,21 @@ def __init__(self,classid='0',components=None,comments=None):
 
     @staticmethod
     def from_grid(grid, type=None, typequote='"', **kwargs):
+        """Create OpenDX field from Grid.
+    
+        Parameters
+        ----------
+        grid : Grid
+        type : str, optional
+        typequote : str, optional
+        **kwargs
+            Additional keyword arguments (currently unused)
+        
+        Returns
+        -------
+        field
+            OpenDX field wrapper
+        """
         comments = [
             "OpenDX density file written by gridDataFormats.Grid.export()",
             "File format: http://opendx.sdsc.edu/docs/html/pages/usrgu068.htm#HDREDF",
@@ -548,6 +563,7 @@ def from_grid(grid, type=None, typequote='"', **kwargs):
 
     @property
     def native(self):
+        """Return native object"""
         return self
 
     def _openfile_writing(self, filename):

gridData/core.py

@@ -605,7 +605,7 @@ def _load_plt(self, filename, **kwargs):
         self._load(grid=grid, edges=edges, metadata=self.metadata)
 
     def convert_to(self, format_specifier, tolerance=None, **kwargs):
-        """Generates an instance of the native object for a given format
+        """Returns an instance of the native object for a given format
         
         Implemented formats:
         
@@ -618,7 +618,7 @@ def convert_to(self, format_specifier, tolerance=None, **kwargs):
         ----------
         format_specifier : str 
         
-        tolerance : float (default is None)
+        tolerance : float (default is None) - for OpenVDB
             
         Returns
         -------

gridData/mrc.py

@@ -103,6 +103,21 @@ def __init__(self, filename=None, assume_volumetric=False):
 
     @staticmethod
     def from_grid(grid, **kwargs):
+        """Create MRC object from a Grid.
+        
+        Parameters
+        ----------
+        grid : Grid
+            Grid object to convert
+        **kwargs
+            Additional keyword arguments (currently unused)
+        
+        Returns
+        -------
+        MRC
+            MRC wrapper object
+        
+        """
         mrc_obj = MRC()
 
         mrc_obj.array = grid.grid