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N Panel

I am creating a button on the 'N' panel that when you click, adds a Shrink Wrap modifier to the currently selected object. I would like the object picker below the 'Test Button' to be the Target Property for the Shrink Wrap modifier instead of the currently set 'Sphere' so I can select my target object from the dropdown. And the object picker is to be conditioned to only appear when the 'Test Button' is clicked. How do I go about it? See my current code set up below.

####### IMPORTS import bpy from bpy.props import * ####### THE USER PANEL class MODIFIER_PT_Test_Panel(bpy.types.Panel): bl_label = "Test Panel" bl_idname = "MODIFIER_PT_Test_Panel" bl_space_type = "VIEW_3D" bl_region_type = "UI" bl_category = 'Test' bl_order = 0 def draw(self, context): layout = self.layout #This is the 'Test Button' on 'Test' panel op = layout.operator("view3d.add_modifier_to_object",text= "Test Button") #This is the object picker property above the 'Test Button' on 'Test' panel self.layout.prop(context.scene, "object_selector_for_modifier", text = "") ####### OPERATORS ####### Focus 3D view to selected object operator class ModifierOnOjectOperator(bpy.types.Operator): """Center the 3D view on a selected object""" bl_idname = "view3d.add_modifier_to_object" bl_label = "Center On Cube" def execute(self, context): if context.scene.object_selector_for_modifier is None: self.report({"ERROR"}, "You must select an object to center the view on") return {"CANCELLED"} orig_selected = bpy.context.selected_objects bpy.ops.object.select_all(action = "DESELECT") context.scene.object_selector_for_modifier.select_set(True) ####### Add a shrink wrap modifier shrink_mod = context.object.modifiers.new(name="Shrinkie", type='SHRINKWRAP') shrink_mod.offset = 0.01 shrink_mod.target = context.scene.objects['Sphere'] bpy.ops.object.select_all(action = "DESELECT") for obj in orig_selected: obj.select_set(True) return {"FINISHED"} ####### REGISTER ADDON def register(): bpy.utils.register_class(MODIFIER_PT_Test_Panel) bpy.utils.register_class(ModifierOnOjectOperator) bpy.types.Scene.object_selector_for_modifier = bpy.props.PointerProperty( type = bpy.types.Object, name = "Shrink Wrap Target", ) ####### UNREGISTER ADDON def unregister(): bpy.utils.unregister_class(MODIFIER_PT_Test_Panel) bpy.utils.unregister_class(ModifierOnOjectOperator) bpy.types.Scene.object_selector_for_modifier = bpy.props.PointerProperty( type = bpy.types.Object, name = "Shrink Wrap Target", ) ```
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You can save the user a click by allowing them to select the target object and then add the modifier. Also have a look into: Limit "prop_search" to Specific Types of Objects

import bpy class OBJECT_OT_SimpleOperator(bpy.types.Operator): """Tooltip""" bl_idname = "object.simple_operator" bl_label = "Simple Object Operator" @classmethod def poll(cls, context): return context.scene.shrink_target != context.active_object def execute(self, context): obj = context.object shrink_mod = None for m in obj.modifiers: if m.type == 'SHRINKWRAP': shrink_mod = m if shrink_mod is None: shrink_mod = obj.modifiers.new(name="Shrinkie", type='SHRINKWRAP') shrink_mod.offset = 0.01 shrink_mod.target = context.scene.shrink_target return {'FINISHED'} class OBJECT_PT_HelloWorldPanel(bpy.types.Panel): bl_label = "My Panel" bl_idname = "OBJECT_PT_HelloWorldPanel" bl_space_type = "VIEW_3D" bl_region_type = "UI" bl_category = "Tools" bl_context = "objectmode" def draw(self, context): layout = self.layout scene = context.scene obj = context.object col = layout.column() col.alert = False if scene.shrink_target else True col.prop(scene, "shrink_target") col = layout.column() col.operator(OBJECT_OT_SimpleOperator.bl_idname) def target_poll(self, object): return object.type == 'MESH' def register(): bpy.utils.register_class(OBJECT_PT_HelloWorldPanel) bpy.utils.register_class(OBJECT_OT_SimpleOperator) bpy.types.Scene.shrink_target = bpy.props.PointerProperty( name="Target", type=bpy.types.Object, poll=target_poll ) def unregister(): bpy.utils.unregister_class(OBJECT_PT_HelloWorldPanel) bpy.utils.unregister_class(OBJECT_OT_SimpleOperator) del bpy.types.Scene.shrink_target if __name__ == "__main__": register()
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