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, 10 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_armature.c b/source/blender/makesrna/intern/rna_armature.c
index 554f04ca23c..c54621372ba 100644
--- a/source/blender/makesrna/intern/rna_armature.c
+++ b/source/blender/makesrna/intern/rna_armature.c
@@ -1537,6 +1537,16 @@ static void rna_def_armature(BlenderRNA *brna)
   RNA_def_property_update(prop, 0, "rna_Armature_redraw_data");
   RNA_def_property_flag(prop, PROP_LIB_EXCEPTION);
 
+  prop = RNA_def_property(srna, "axes_position", PROP_FLOAT, PROP_FACTOR);
+  RNA_def_property_float_sdna(prop, NULL, "axes_position");
+  RNA_def_property_range(prop, 0.0, 1.0);
+  RNA_def_property_ui_range(prop, 0.0, 1.0, 10, 1);
+  RNA_def_property_ui_text(prop,
+                           "Axes Position",
+                           "The position for the axes on the bone. Increasing the value moves it "
+                           "closer to the tip; decreasing moves it closer to the root");
+  RNA_def_property_update(prop, 0, "rna_Armature_redraw_data");
+
   prop = RNA_def_property(srna, "show_names", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flag", ARM_DRAWNAMES);
   RNA_def_property_ui_text(prop, "Display Names", "Display bone names");