diff --git a/scene/3d/multimesh_instance_3d.cpp b/scene/3d/multimesh_instance_3d.cpp
index 2eef1dbbf4dc..baa048b3bbb2 100644
--- a/scene/3d/multimesh_instance_3d.cpp
+++ b/scene/3d/multimesh_instance_3d.cpp
@@ -42,9 +42,66 @@ void MultiMeshInstance3D::_physics_interpolated_changed() {
 	_refresh_interpolated();
 }
 
+bool MultiMeshInstance3D::_set(const StringName &p_name, const Variant &p_value) {
+	//this is not _too_ bad performance wise, really. it only arrives here if the property was not set anywhere else.
+	//add to it that it's probably found on first call to _set anyway.
+
+	if (!get_instance().is_valid()) {
+		return false;
+	}
+
+	if (p_name.operator String().begins_with("surface_material_override/")) {
+		int idx = p_name.operator String().get_slicec('/', 1).to_int();
+
+		if (idx >= surface_override_materials.size() || idx < 0) {
+			return false;
+		}
+
+		set_surface_override_material(idx, p_value);
+		return true;
+	}
+
+	return false;
+}
+
+bool MultiMeshInstance3D::_get(const StringName &p_name, Variant &r_ret) const {
+	if (!get_instance().is_valid()) {
+		return false;
+	}
+
+	if (p_name.operator String().begins_with("surface_material_override/")) {
+		int idx = p_name.operator String().get_slicec('/', 1).to_int();
+		if (idx >= surface_override_materials.size() || idx < 0) {
+			return false;
+		}
+		r_ret = surface_override_materials[idx];
+		return true;
+	}
+	return false;
+}
+
+void MultiMeshInstance3D::_get_property_list(List<PropertyInfo> *p_list) const {	
+	if (multimesh.is_valid()) {
+		Ref<Mesh> mesh = multimesh->get_mesh();
+		if (mesh.is_valid()) {
+			for (int i = 0; i < mesh->get_surface_count(); i++) {
+				p_list->push_back(PropertyInfo(Variant::OBJECT, vformat("%s/%d", PNAME("surface_material_override"), i), PROPERTY_HINT_RESOURCE_TYPE, "BaseMaterial3D,ShaderMaterial", PROPERTY_USAGE_DEFAULT));
+			}
+		}
+	}
+
+	
+}
+
 void MultiMeshInstance3D::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_multimesh", "multimesh"), &MultiMeshInstance3D::set_multimesh);
 	ClassDB::bind_method(D_METHOD("get_multimesh"), &MultiMeshInstance3D::get_multimesh);
+
+	ClassDB::bind_method(D_METHOD("get_surface_override_material_count"), &MultiMeshInstance3D::get_surface_override_material_count);
+	ClassDB::bind_method(D_METHOD("set_surface_override_material", "surface", "material"), &MultiMeshInstance3D::set_surface_override_material);
+	ClassDB::bind_method(D_METHOD("get_surface_override_material", "surface"), &MultiMeshInstance3D::get_surface_override_material);
+	ClassDB::bind_method(D_METHOD("get_active_material", "surface"), &MultiMeshInstance3D::get_active_material);
+
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "multimesh", PROPERTY_HINT_RESOURCE_TYPE, "MultiMesh"), "set_multimesh", "get_multimesh");
 }
 
@@ -54,14 +111,86 @@ void MultiMeshInstance3D::_notification(int p_what) {
 	}
 }
 
+void MultiMeshInstance3D::_validate_property(PropertyInfo &p_property) const {
+	if (p_property.name == "multimesh") {
+		WARN_PRINT_ED("Multimesh validated.");
+	}
+}
+
+void MultiMeshInstance3D::_multimesh_changed() {
+
+	ERR_FAIL_COND(multimesh.is_null());
+
+	Ref<Mesh> mesh = multimesh->get_mesh();
+	WARN_PRINT_ED("Multimesh changed.");
+
+	if (mesh.is_valid()) {
+		surface_override_materials.resize(mesh->get_surface_count());
+
+		int surface_count = mesh->get_surface_count();
+		for (int surface_index = 0; surface_index < surface_count; ++surface_index) {
+			if (surface_override_materials[surface_index].is_valid()) {
+				RS::get_singleton()->multimesh_set_surface_override_material(get_instance(), surface_index, surface_override_materials[surface_index]->get_rid());
+			}
+		}
+	} else {
+		surface_override_materials.resize(0);
+	}
+
+	//notify_property_list_changed();
+}
+
 void MultiMeshInstance3D::set_multimesh(const Ref<MultiMesh> &p_multimesh) {
-	multimesh = p_multimesh;
+	if (multimesh == p_multimesh) {
+		return;
+	}
+
 	if (multimesh.is_valid()) {
+		multimesh->disconnect_changed(callable_mp(this, &MultiMeshInstance3D::_multimesh_changed));
+	}
+
+	multimesh = p_multimesh;
+
+	if (multimesh.is_valid()) {	
 		set_base(multimesh->get_rid());
+
+		multimesh->connect_changed(callable_mp(this, &MultiMeshInstance3D::_multimesh_changed));
+		_multimesh_changed();
+
 		_refresh_interpolated();
+
 	} else {
 		set_base(RID());
 	}
+
+	notify_property_list_changed();
+
+	// multimesh = p_multimesh;
+
+	// if (multimesh.is_valid()) {
+	// 	set_base(multimesh->get_rid());
+
+	// 	// Adapted from MeshInstance3D::_mesh_changed() and inlined.
+	// 	Ref<Mesh> mesh = multimesh->get_mesh();
+	// 	if (mesh.is_valid()) {
+	// 		surface_override_materials.resize(mesh->get_surface_count());
+
+	// 		int surface_count = mesh->get_surface_count();
+	// 		for (int surface_index = 0; surface_index < surface_count; ++surface_index) {
+	// 			if (surface_override_materials[surface_index].is_valid()) {
+	// 				RS::get_singleton()->multimesh_set_surface_override_material(get_instance(), surface_index, surface_override_materials[surface_index]->get_rid());
+	// 			}
+	// 		}
+	// 	} else {
+	// 		surface_override_materials.resize(0);
+	// 	}
+
+	// 	_refresh_interpolated();
+	// } else {
+	// 	set_base(RID());
+	// }
+
+	// notify_property_list_changed();
 }
 
 Ref<MultiMesh> MultiMeshInstance3D::get_multimesh() const {
@@ -88,6 +217,48 @@ Array MultiMeshInstance3D::get_meshes() const {
 	return results;
 }
 
+int MultiMeshInstance3D::get_surface_override_material_count() const {
+	return surface_override_materials.size();
+}
+
+void MultiMeshInstance3D::set_surface_override_material(int p_surface, const Ref<Material> &p_material) {
+	ERR_FAIL_INDEX(p_surface, surface_override_materials.size());
+
+	surface_override_materials.write[p_surface] = p_material;
+
+	if (surface_override_materials[p_surface].is_valid()) {
+		RS::get_singleton()->multimesh_set_surface_override_material(get_instance(), p_surface, surface_override_materials[p_surface]->get_rid());
+	} else {
+		RS::get_singleton()->multimesh_set_surface_override_material(get_instance(), p_surface, RID());
+	}
+}
+
+Ref<Material> MultiMeshInstance3D::get_surface_override_material(int p_surface) const {
+	ERR_FAIL_INDEX_V(p_surface, surface_override_materials.size(), Ref<Material>());
+
+	return surface_override_materials[p_surface];
+}
+
+Ref<Material> MultiMeshInstance3D::get_active_material(int p_surface) const {
+	Ref<Material> mat_override = get_material_override();
+	if (mat_override.is_valid()) {
+		return mat_override;
+	}
+
+	Ref<Material> surface_material = get_surface_override_material(p_surface);
+	if (surface_material.is_valid()) {
+		return surface_material;
+	}
+
+	// Ref<Mesh> m = get_mesh();
+	Ref<Mesh> m = multimesh.is_valid() ? multimesh->get_mesh() : Ref<Mesh>();
+	if (m.is_valid()) {
+		return m->surface_get_material(p_surface);
+	}
+
+	return Ref<Material>();
+}
+
 AABB MultiMeshInstance3D::get_aabb() const {
 	if (multimesh.is_null()) {
 		return AABB();
diff --git a/scene/3d/multimesh_instance_3d.h b/scene/3d/multimesh_instance_3d.h
index c9507b1047e3..90a2901e9dcf 100644
--- a/scene/3d/multimesh_instance_3d.h
+++ b/scene/3d/multimesh_instance_3d.h
@@ -42,9 +42,18 @@ class MultiMeshInstance3D : public GeometryInstance3D {
 	void _refresh_interpolated();
 
 protected:
+	void _multimesh_changed();
+
+	bool _set(const StringName &p_name, const Variant &p_value);
+	bool _get(const StringName &p_name, Variant &r_ret) const;
+
 	virtual void _physics_interpolated_changed() override;
+	void _get_property_list(List<PropertyInfo> *p_list) const;
 	static void _bind_methods();
 	void _notification(int p_what);
+	void _validate_property(PropertyInfo &p_property) const;
+
+	Vector<Ref<Material>> surface_override_materials;
 
 public:
 	void set_multimesh(const Ref<MultiMesh> &p_multimesh);
@@ -52,6 +61,11 @@ class MultiMeshInstance3D : public GeometryInstance3D {
 
 	Array get_meshes() const;
 
+	int get_surface_override_material_count() const;
+	void set_surface_override_material(int p_surface, const Ref<Material> &p_material);
+	Ref<Material> get_surface_override_material(int p_surface) const;
+	Ref<Material> get_active_material(int p_surface) const;
+
 	virtual AABB get_aabb() const override;
 
 	MultiMeshInstance3D();
diff --git a/servers/rendering/renderer_scene_cull.cpp b/servers/rendering/renderer_scene_cull.cpp
index 1d25dec633b5..7eced209629b 100644
--- a/servers/rendering/renderer_scene_cull.cpp
+++ b/servers/rendering/renderer_scene_cull.cpp
@@ -1097,6 +1097,26 @@ void RendererSceneCull::instance_set_surface_override_material(RID p_instance, i
 	_instance_queue_update(instance, false, true);
 }
 
+void RendererSceneCull::multimesh_set_surface_override_material(RID p_instance, int p_surface, RID p_material) {
+	Instance *instance = instance_owner.get_or_null(p_instance);
+	ERR_FAIL_NULL(instance);
+
+	if (instance->base_type == RS::INSTANCE_MULTIMESH) {
+		RID mesh = RSG::mesh_storage->multimesh_get_mesh(instance->base);
+		//if (mesh.is_valid()) {
+		{
+			//may not have been updated yet, may also have not been set yet. When updated will be correcte, worst case
+			instance->materials.resize(MAX(p_surface + 1, RSG::mesh_storage->mesh_get_surface_count(mesh)));
+		}
+	}
+
+	ERR_FAIL_INDEX(p_surface, instance->materials.size());
+
+	instance->materials.write[p_surface] = p_material;
+
+	_instance_queue_update(instance, false, true);
+}
+
 void RendererSceneCull::instance_set_visible(RID p_instance, bool p_visible) {
 	Instance *instance = instance_owner.get_or_null(p_instance);
 	ERR_FAIL_NULL(instance);
@@ -4125,8 +4145,11 @@ void RendererSceneCull::_update_dirty_instance(Instance *p_instance) {
 						bool cast_shadows = false;
 
 						int sc = RSG::mesh_storage->mesh_get_surface_count(mesh);
+						// int mc = p_instance->materials.size();
+						// sc = MIN(sc,mc);
 						for (int i = 0; i < sc; i++) {
 							RID mat = RSG::mesh_storage->mesh_surface_get_material(mesh, i);
+							//RID mat = p_instance->materials[i].is_valid() ? p_instance->materials[i] : RSG::mesh_storage->mesh_surface_get_material(mesh, i);
 
 							if (!mat.is_valid()) {
 								cast_shadows = true;
diff --git a/servers/rendering/renderer_scene_cull.h b/servers/rendering/renderer_scene_cull.h
index 972f66d325ff..40d172748580 100644
--- a/servers/rendering/renderer_scene_cull.h
+++ b/servers/rendering/renderer_scene_cull.h
@@ -1064,6 +1064,8 @@ class RendererSceneCull : public RenderingMethod {
 	virtual void instance_attach_object_instance_id(RID p_instance, ObjectID p_id);
 	virtual void instance_set_blend_shape_weight(RID p_instance, int p_shape, float p_weight);
 	virtual void instance_set_surface_override_material(RID p_instance, int p_surface, RID p_material);
+	virtual void multimesh_set_surface_override_material(RID p_instance, int p_surface, RID p_material);
+
 	virtual void instance_set_visible(RID p_instance, bool p_visible);
 	virtual void instance_geometry_set_transparency(RID p_instance, float p_transparency);
 
diff --git a/servers/rendering/rendering_method.h b/servers/rendering/rendering_method.h
index f6212faf085d..660666384147 100644
--- a/servers/rendering/rendering_method.h
+++ b/servers/rendering/rendering_method.h
@@ -88,6 +88,7 @@ class RenderingMethod {
 	virtual void instance_attach_object_instance_id(RID p_instance, ObjectID p_id) = 0;
 	virtual void instance_set_blend_shape_weight(RID p_instance, int p_shape, float p_weight) = 0;
 	virtual void instance_set_surface_override_material(RID p_instance, int p_surface, RID p_material) = 0;
+	virtual void multimesh_set_surface_override_material(RID p_instance, int p_surface, RID p_material) = 0;
 	virtual void instance_set_visible(RID p_instance, bool p_visible) = 0;
 	virtual void instance_geometry_set_transparency(RID p_instance, float p_transparency) = 0;
 
diff --git a/servers/rendering/rendering_server_default.h b/servers/rendering/rendering_server_default.h
index 60fa546e164c..35a4f70c2598 100644
--- a/servers/rendering/rendering_server_default.h
+++ b/servers/rendering/rendering_server_default.h
@@ -325,6 +325,9 @@ class RenderingServerDefault : public RenderingServer {
 	FUNC1RC(int, multimesh_get_instance_count, RID)
 
 	FUNC2(multimesh_set_mesh, RID, RID)
+
+	// FUNC3(multimesh_set_surface_override_material, RID, int, RID)	
+	
 	FUNC3(multimesh_instance_set_transform, RID, int, const Transform3D &)
 	FUNC3(multimesh_instance_set_transform_2d, RID, int, const Transform2D &)
 	FUNC3(multimesh_instance_set_color, RID, int, const Color &)
@@ -814,6 +817,7 @@ class RenderingServerDefault : public RenderingServer {
 	FUNC2(instance_attach_object_instance_id, RID, ObjectID)
 	FUNC3(instance_set_blend_shape_weight, RID, int, float)
 	FUNC3(instance_set_surface_override_material, RID, int, RID)
+	FUNC3(multimesh_set_surface_override_material, RID, int, RID)
 	FUNC2(instance_set_visible, RID, bool)
 
 	FUNC2(instance_set_custom_aabb, RID, AABB)
diff --git a/servers/rendering_server.cpp b/servers/rendering_server.cpp
index 92f0f0dbc0c9..32ad879e6b3e 100644
--- a/servers/rendering_server.cpp
+++ b/servers/rendering_server.cpp
@@ -2422,6 +2422,7 @@ void RenderingServer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("multimesh_allocate_data", "multimesh", "instances", "transform_format", "color_format", "custom_data_format"), &RenderingServer::multimesh_allocate_data, DEFVAL(false), DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("multimesh_get_instance_count", "multimesh"), &RenderingServer::multimesh_get_instance_count);
 	ClassDB::bind_method(D_METHOD("multimesh_set_mesh", "multimesh", "mesh"), &RenderingServer::multimesh_set_mesh);
+	ClassDB::bind_method(D_METHOD("multimesh_set_surface_override_material", "multimesh", "surface", "material"), &RenderingServer::multimesh_set_surface_override_material);
 	ClassDB::bind_method(D_METHOD("multimesh_instance_set_transform", "multimesh", "index", "transform"), &RenderingServer::multimesh_instance_set_transform);
 	ClassDB::bind_method(D_METHOD("multimesh_instance_set_transform_2d", "multimesh", "index", "transform"), &RenderingServer::multimesh_instance_set_transform_2d);
 	ClassDB::bind_method(D_METHOD("multimesh_instance_set_color", "multimesh", "index", "color"), &RenderingServer::multimesh_instance_set_color);
diff --git a/servers/rendering_server.h b/servers/rendering_server.h
index d8b665183337..aec067af2005 100644
--- a/servers/rendering_server.h
+++ b/servers/rendering_server.h
@@ -435,6 +435,7 @@ class RenderingServer : public Object {
 	virtual int multimesh_get_instance_count(RID p_multimesh) const = 0;
 
 	virtual void multimesh_set_mesh(RID p_multimesh, RID p_mesh) = 0;
+	virtual void multimesh_set_surface_override_material(RID p_multimesh, int p_surface, RID p_material) = 0;
 	virtual void multimesh_instance_set_transform(RID p_multimesh, int p_index, const Transform3D &p_transform) = 0;
 	virtual void multimesh_instance_set_transform_2d(RID p_multimesh, int p_index, const Transform2D &p_transform) = 0;
 	virtual void multimesh_instance_set_color(RID p_multimesh, int p_index, const Color &p_color) = 0;