Transformation Channel Driver Variables - "Proper Localspace"

By popular demand, the "Transformation Channel" driver variable type
now has a "local space" transform space option which uses the same
magic that constraints use for defining local-space. This is what many
bug reporters and feature requesters have moaned about for a while
now, so after reviewing several of the bug reports which lead to the
current situation, here is what has been much-wanted for so long!

In order to implement this, I've:
- renamed the old "Local Space" option here to "Transformation Space",
in order to prevent old rigs breaking. This has also been kept, as it
is useful for #21384 (though perhaps with this new option it isn't
needed anymore)
- reviewed my fix for #20870 (IIRC, a Durian-era bug), which related
to the non-uniqueness of matrix->euler decomposition

1 files changed, 5 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_anim_types.h b/source/blender/makesdna/DNA_anim_types.h
index c650d15722d..00a9786fc6f 100644
--- a/source/blender/makesdna/DNA_anim_types.h
+++ b/source/blender/makesdna/DNA_anim_types.h
@@ -289,8 +289,12 @@ typedef enum eDriverTarget_Flag {
 	DTAR_FLAG_STRUCT_REF	= (1<<0),
 		/* idtype can only be 'Object' */
 	DTAR_FLAG_ID_OB_ONLY	= (1<<1),
-		/* toggles localspace (where transforms are manually obtained) */
+	
+	/* "localspace" flags */
+		/* base flag - basically "pre parent+constraints" */
 	DTAR_FLAG_LOCALSPACE	= (1<<2),
+		/* include constraints transformed to space including parents */
+	DTAR_FLAG_LOCAL_CONSTS	= (1<<3),
 } eDriverTarget_Flag;
 
 /* Transform Channels for Driver Targets */