Armature: Add Display Axis Offset

Display the bone axes at the head (root) of the bone by default, instead
of the tail (tip), and add a slider so that it's possible to adjust this
position.

Versioning code is in place to ensure existing files behave the same
(axes shown at tail), whereas new Armatures will be using the new
default (axes shown at head).

Reviewed By: #animation_rigging, #user_interface, Severin, Sybren

Differential Revision: https://developer.blender.org/D7685

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_290.c b/source/blender/blenloader/intern/versioning_290.c
index aae5a2ec190..2449e35055e 100644
--- a/source/blender/blenloader/intern/versioning_290.c
+++ b/source/blender/blenloader/intern/versioning_290.c
@@ -27,6 +27,7 @@
 #include "BLI_utildefines.h"
 
 #include "DNA_anim_types.h"
+#include "DNA_armature_types.h"
 #include "DNA_brush_types.h"
 #include "DNA_cachefile_types.h"
 #include "DNA_collection_types.h"
@@ -1948,5 +1949,12 @@ void blo_do_versions_290(FileData *fd, Library *UNUSED(lib), Main *bmain)
    */
   {
     /* Keep this block, even when empty. */
+
+    if (!DNA_struct_elem_find(fd->filesdna, "bArmature", "float", "axes_position")) {
+      /* Convert the axes draw position to its old default (tip of bone). */
+      LISTBASE_FOREACH (struct bArmature *, arm, &bmain->armatures) {
+        arm->axes_position = 1.0;
+      }
+    }
   }
 }