adds option for different selection modes

src/operators/bake_to_id_map.py

@@ -27,7 +27,7 @@ class BakeToIDMapOperator(bpy.types.Operator):
     def paint_id_mask(self, context, props):
         source = get_source(props.source)
 
-        targets = source.get_targets(context)
+        targets = self.get_targets(context, source, props)
 
         if len(targets) < 1:
             return
@@ -49,6 +49,35 @@ class BakeToIDMapOperator(bpy.types.Operator):
             colors.append(colorsys.hls_to_rgb(h, l, s))
 
         target = get_target(props.target)
-        target.paint_targets(props, targets, colors)
+        self.paint_targets(props, target, targets, colors)
         if 'after_painting' in dir(source):
-            source.after_painting(context, props)
+            source.after_painting(context, props)
+
+    def get_targets(self, context, source, props):
+        if props.selection_mode == 'SINGLE':
+            return source.get_targets([context.active_object])
+
+        if props.selection_mode == 'MULTIPLE_COMBINED':
+            return source.get_targets(context.selected_objects)
+
+        if props.selection_mode == 'MULTIPLE_SEPARATE':
+            result = []
+            for obj in context.selected_objects:
+                if obj.type != 'MESH':
+                    continue
+
+                obj_targets = source.get_targets([obj])
+                result.append(obj_targets)
+
+            return result
+
+        raise ValueError('Invalid selection_mode')
+
+    def paint_targets(self, props, target, targets, colors):
+        if props.selection_mode == 'MULTIPLE_SEPARATE':
+            for targetList in targets:
+                target.paint_targets(props,targetList, colors)
+
+            return
+
+        target.paint_targets(props, targets, colors)

src/panels/panel.py

@@ -13,4 +13,19 @@ class BakeToIDMapPanel(bpy.types.Panel):
         layout.use_property_split = True
         layout.use_property_decorate = False  # No animation.
 
-        self.layout.operator("object.bake_to_id_map", text="Bake")
+        props = context.scene.bake_to_id_props
+
+        operator_row = layout.row()
+        operator_row.operator("object.bake_to_id_map", text="Bake")
+        operator_row.enabled = self.check_if_props_valid(context, props)
+
+        layout.prop(props, "selection_mode")
+
+    def check_if_props_valid(self, context, props):
+        if (props.selection_mode == "SINGLE" and context.active_object is None):
+            return False
+
+        if (props.selection_mode != "SINGLE" and len(context.selected_objects) < 1):
+            return False
+
+        return True

src/panels/panel_info.py

@@ -19,5 +19,28 @@ class BakeToIDInfoPanel(bpy.types.Panel):
 
         source = get_source(props.source)
 
-        layout.label(text="Selected Object-Count: " + str(len(context.selected_objects)))
+        if props.selection_mode != 'SINGLE':
-        layout.label(text="Estimated ID-Count: " + str(source.estimate_ids(context, props)))
+            layout.label(text="Selected Object-Count: " + str(len(context.selected_objects)))
+            layout.separator()
+
+        if props.selection_mode == 'SINGLE':
+            layout.label(text="ID-Total: " + str(source.estimate_ids([context.active_object])))
+
+        if props.selection_mode == 'MULTIPLE_SEPARATE':
+            total = 0
+            count = 0
+            for obj in context.selected_objects:
+                if (obj.type != 'MESH'):
+                    continue
+
+                total += source.estimate_ids([obj])
+                count += 1
+
+            layout.label(text="Estimated ID-Total: " + str(total))
+            try:
+                layout.label(text="Estimated ID-Average: " + str(total / count))
+            except ZeroDivisionError:
+                layout.label(text="Estimated ID-Average: 0")
+
+        if props.selection_mode == 'MULTIPLE_COMBINED':
+            layout.label(text="ID-Total: " + str(source.estimate_ids(context.selected_objects)))

src/panels/panel_options.py

@@ -15,6 +15,8 @@ class BakeToIDOptionsPanel(bpy.types.Panel):
 
     def draw(self, context):
         layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False  # No animation.
 
         props = context.scene.bake_to_id_props
 

src/properties/bake_to_id.py

@@ -5,11 +5,22 @@ from src.types import get_source_enum, get_targets_enum
 
 
 class BakeToIDProperties(PropertyGroup):
+    selection_mode: EnumProperty(
+        items=[
+            ("SINGLE", "Only active element", "Only use the currently selected element", 0),
+            ("MULTIPLE_SEPARATE", "Use Selection, separate", "It performs the transfer for every selected element, but each get there own ids", 1),
+            ("MULTIPLE_COMBINED", "Use Selection, combined", "It performs the transfer for every selected element, combining the ids", 2)
+        ],
+        name="Selection Mode",
+        description="Specifies how the 3D View-Selection is gonna be used.",
+        default="MULTIPLE_SEPARATE"
+    )
+
     source: EnumProperty(
         items=get_source_enum(),
         name="Source",
         description="From where should the IDs be taken",
-        default = "MATERIAL_INDEX"
+        default="MATERIAL_INDEX"
 
     )
     target: EnumProperty(

src/types/sources/material_index.py

@@ -6,9 +6,9 @@ connected_properties = [
     'source_materials_remove_all'
 ]
 
-def get_targets(context):
+def get_targets(objects):
     targets = []
-    for obj in context.selected_objects:
+    for obj in objects:
         if not obj.material_slots: continue
 
         mesh = obj.data
@@ -33,9 +33,9 @@ def after_painting(context, props):
         for obj in context.selected_objects:
             obj.data.materials.clear()
 
-def estimate_ids(context, props):
+def estimate_ids(objects):
     count = 0
-    for obj in context.selected_objects:
+    for obj in objects:
         count += len(obj.material_slots)
 
     return count

src/types/sources/object.py

@@ -4,13 +4,13 @@ description = 'Uses the object id as basis for the ID mask.'
 
 connected_properties = []
 
-def get_targets(context):
+def get_targets(objects):
     targets = []
-    for obj in context.selected_objects:
+    for obj in objects:
         mesh = obj.data
         targets.append((mesh, mesh.polygons))
 
     return targets
 
-def estimate_ids(context, props):
+def estimate_ids(objects):
-    return len(context.selected_objects)
+    return len(objects)