From 7f9e28e4e91ac757680fef56e771122cde14c9db Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 8 Apr 2023 11:42:43 +0100
Subject: Remember the name of the adjacent face of each halfedge of each named
 face

Used when extruding to remember what the new face name will be, even after the adjacent face has
been removed/replaced/split/etc
---
 assetFactory/modelFactoryMesh.cpp | 16 ++++++++++++++++
 assetFactory/modelFactoryMesh.h   |  8 ++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/assetFactory/modelFactoryMesh.cpp b/assetFactory/modelFactoryMesh.cpp
index 806ac3b..e640502 100644
--- a/assetFactory/modelFactoryMesh.cpp
+++ b/assetFactory/modelFactoryMesh.cpp
@@ -4,4 +4,20 @@ ModelFactoryMesh::ModelFactoryMesh()
 {
 	add_property(smoothFaceProperty);
 	add_property(nameFaceProperty);
+	add_property(nameAdjFaceProperty);
+}
+
+void
+ModelFactoryMesh::configNamedFace(const std::string & name, OpenMesh::FaceHandle handle)
+{
+	property(nameFaceProperty, handle) = name;
+	const auto halfEdges = fh_range(handle);
+	for (const auto & he : halfEdges) {
+		if (auto ofh = opposite_face_handle(he); ofh.is_valid()) {
+			property(nameAdjFaceProperty, he) = property(nameFaceProperty, ofh);
+		}
+		if (auto oheh = opposite_halfedge_handle(he); oheh.is_valid()) {
+			property(nameAdjFaceProperty, oheh) = name;
+		}
+	}
 }
diff --git a/assetFactory/modelFactoryMesh.h b/assetFactory/modelFactoryMesh.h
index a862dc1..8ac2edd 100644
--- a/assetFactory/modelFactoryMesh.h
+++ b/assetFactory/modelFactoryMesh.h
@@ -48,13 +48,17 @@ struct ModelFactoryMesh : public OpenMesh::PolyMesh_ArrayKernelT<ModelFactoryTra
 
 	OpenMesh::FPropHandleT<bool> smoothFaceProperty;
 	OpenMesh::FPropHandleT<std::string> nameFaceProperty;
+	OpenMesh::HPropHandleT<std::string> nameAdjFaceProperty;
 
 	template<typename... Vs>
 	std::pair<std::string, OpenMesh::FaceHandle>
 	add_namedFace(std::string name, Vs &&... vs)
 	{
 		const auto handle = add_face(std::forward<Vs>(vs)...);
-		property(nameFaceProperty, handle) = name;
-		return std::make_pair(name, handle);
+		configNamedFace(name, handle);
+		return {std::move(name), handle};
 	}
+
+private:
+	void configNamedFace(const std::string & name, OpenMesh::FaceHandle);
 };
-- 
cgit v1.2.3