__init__.py

@@ -31,6 +31,19 @@ from . import operators
 from . import utils # Just for importlib.reload()
 import importlib
 
+import bpy
+from bpy.types import AddonPreferences
+from bpy.props import BoolProperty
+
+class LatticeMagicPreferences(AddonPreferences):
+	bl_idname = __name__
+	
+	update_active_shape_key: BoolProperty(
+		name = 'Update Active Shape Key',
+		description = "Update the active shape key on frame change based on the current frame and the shape key's name.",
+		default = False
+	)
+
 modules = [
 	camera_lattice
 	,tweak_lattice
@@ -39,12 +52,16 @@ modules = [
 ]
 
 def register():
+	from bpy.utils import register_class
+	register_class(LatticeMagicPreferences)
 	for m in modules:
 		importlib.reload(m)
 		if hasattr(m, 'register'):
 			m.register()
 
 def unregister():
+	from bpy.utils import unregister_class
+	unregister_class(LatticeMagicPreferences)
 	for m in modules:
 		m.unregister()
 		if hasattr(m, 'unregister'):

camera_lattice.py

@@ -9,6 +9,7 @@
 
 import bpy
 import math
+from bpy.app.handlers import persistent
 from mathutils import Vector
 from bpy.props import BoolProperty, PointerProperty, CollectionProperty, IntProperty, EnumProperty, FloatProperty
 from mathutils.geometry import intersect_point_line
@@ -499,10 +500,11 @@ class CAMLAT_PT_Main(bpy.types.Panel):
 		col = layout.column()
 
 		row = layout.row(align=True)
-		row.operator('lattice.reset_points', text="", icon='RECOVER_LAST')
-		row.separator()
 		row.operator(CAMLAT_OT_ShapeKey_Zero_All.bl_idname, text="", icon='RADIOBUT_OFF')
 		row.operator(CAMLAT_OT_ShapeKey_Keyframe_All.bl_idname, text="", icon='HANDLETYPE_FREE_VEC')
+		row.separator()
+		prefs = context.preferences.addons[__package__].preferences
+		row.prop(prefs, 'update_active_shape_key', toggle=True, text="", icon='TIME')
 
 		row = layout.row()
 
@@ -526,6 +528,42 @@ class CAMLAT_PT_Main(bpy.types.Panel):
 		move_down_op = col.operator('object.shape_key_move', text="", icon='TRIA_DOWN')
 		move_down_op.type='DOWN'
 
+@persistent
+def camera_lattice_frame_change(scene):
+	"""On frame change, set the active shape key of the active lattice object to the most recent frame
+	
+	(Assuming the shape keys are named after the frame on which they are used)
+	"""
+
+	# I wonder why this function doesn't recieve a context... should it not be relied on from here? o.0
+	context = bpy.context
+
+	prefs = context.preferences.addons[__package__].preferences
+	if not prefs.update_active_shape_key: return
+
+	ob = context.object
+	if not shape_key_poll(context):
+		return
+
+	key_blocks = ob.data.shape_keys.key_blocks
+
+	current_frame = scene.frame_current
+	most_recent_number = 0
+	most_recent_index = 1
+	for i, kb in enumerate(key_blocks):
+		if not kb.name.startswith('Frame '): continue
+		number_str = kb.name[5:].split(".")[0]
+		if number_str=="": continue
+		number = int(number_str)
+		if number <= current_frame and number >= most_recent_number:
+			most_recent_number = number
+			most_recent_index = i
+			if most_recent_number == current_frame:
+				break
+
+	if ob.active_shape_key_index != most_recent_index:
+		ob.active_shape_key_index = most_recent_index
+
 classes = [
 	LatticeSlot
 	,CAMLAT_UL_lattice_slots
@@ -551,6 +589,7 @@ def register():
 
 	bpy.types.Scene.lattice_slots = CollectionProperty(type=LatticeSlot)
 	bpy.types.Scene.active_lattice_index = IntProperty()
+	bpy.app.handlers.frame_change_post.append(camera_lattice_frame_change)
 
 def unregister():
 	from bpy.utils import unregister_class
@@ -559,3 +598,5 @@ def unregister():
 	
 	del bpy.types.Scene.lattice_slots
 	del bpy.types.Scene.active_lattice_index
+	
+	bpy.app.handlers.frame_change_post.remove(camera_lattice_frame_change)