Add optional object target for constant cursor follow

OP_cursor_snap_canvas.py

@@ -114,13 +114,17 @@ prev_matrix = None
 ## used in properties file to register in boolprop update
 def cursor_follow_update(self, context):
     '''append or remove cursor_follow handler according a boolean'''
+    ob = bpy.context.object
+    if bpy.context.scene.gptoolprops.cursor_follow_target:
+        ## override with target object is specified
+        ob = bpy.context.scene.gptoolprops.cursor_follow_target
     global prev_matrix
     # imported in properties to register in boolprop update
     if self.cursor_follow:#True
+        if ob:
+            # out of below condition to be called when setting target as well
+            prev_matrix = ob.matrix_world.copy()
         if not cursor_follow.__name__ in [hand.__name__ for hand in bpy.app.handlers.frame_change_post]:
-            if context.object:
-                prev_matrix = context.object.matrix_world.copy()
-            
             bpy.app.handlers.frame_change_post.append(cursor_follow)
     
     else:#False
@@ -131,10 +135,13 @@ def cursor_follow_update(self, context):
 
 def cursor_follow(scene):
     '''Handler to make the cursor follow active object matrix changes on frame change'''
-    if not bpy.context.object:
+    ob = bpy.context.object
+    if bpy.context.scene.gptoolprops.cursor_follow_target:
+        ## override with target object is specified
+        ob = bpy.context.scene.gptoolprops.cursor_follow_target
+    if not ob:
         return
     global prev_matrix
-    ob = bpy.context.object
     current_matrix = ob.matrix_world
     if not prev_matrix:
         prev_matrix = current_matrix.copy()
@@ -161,6 +168,9 @@ def selection_changed():
     """Callback function for selection changes"""
     if not bpy.context.scene.gptoolprops.cursor_follow:
         return
+    if bpy.context.scene.gptoolprops.cursor_follow_target:
+        # we are following a target, nothing to update on selection change
+        return
     global prev_matrix, prev_active_obj
     if prev_active_obj != bpy.context.object:
         ## Set stored matrix to active object

UI_tools.py

@@ -281,6 +281,8 @@ class GPTB_PT_anim_manager(Panel):
         col.use_property_split = False
         text, icon = ('Cursor Follow On', 'PIVOT_CURSOR') if context.scene.gptoolprops.cursor_follow else ('Cursor Follow Off', 'CURSOR')
         col.prop(context.scene.gptoolprops, 'cursor_follow', text=text, icon=icon)
+        if context.scene.gptoolprops.cursor_follow:
+            col.prop(context.scene.gptoolprops, 'cursor_follow_target', text='Target', icon='OBJECT_DATA')
         
 
 class GPTB_PT_toolbox_playblast(Panel):

properties.py

@@ -178,6 +178,11 @@ class GP_PG_ToolsSettings(PropertyGroup):
         name='Cursor Follow', description="3D cursor follow active object animation when activated",
         default=False, update=cursor_follow_update)
 
+    cursor_follow_target : bpy.props.PointerProperty(
+        name='Cursor Follow Target',
+        description="Optional target object to follow for cursor instead of active object",
+        type=bpy.types.Object, update=cursor_follow_update)
+
     ## gpv3 : no edit line color anymore
     # edit_lines_opacity : FloatProperty(
     #     name="Edit Lines Opacity", description="Change edit lines opacity for all grease pencils",