Calculate vertex normals only

Doesn't require half edge normals or face normals, which uses Newell's
method, which results in integer overflow... Not to mention we don't
need all the other normals.

2 files changed, 16 insertions, 6 deletions

diff --git a/game/geoData.cpp b/game/geoData.cpp
index 7710efe..70133a9 100644
--- a/game/geoData.cpp
+++ b/game/geoData.cpp
@@ -57,8 +57,7 @@ GeoData::loadFromAsciiGrid(const std::filesystem::path & input)
 			});
 		}
 	}
-	mesh.update_face_normals();
-	mesh.update_vertex_normals();
+	mesh.update_vertex_normals_only();
 
 	return mesh;
 };
@@ -77,8 +76,7 @@ GeoData::createFlat(GlobalPosition2D lower, GlobalPosition2D upper, GlobalDistan
 	mesh.add_face(ll, uu, lu);
 	mesh.add_face(ll, ul, uu);
 
-	mesh.update_face_normals();
-	mesh.update_vertex_normals();
+	mesh.update_vertex_normals_only();
 
 	return mesh;
 }
@@ -317,3 +315,13 @@ GeoData::findBoundaryStart() const
 		return is_boundary(heh);
 	});
 }
+
+void
+GeoData::update_vertex_normals_only()
+{
+	for (auto vh : all_vertices()) {
+		Normal3D n;
+		calc_vertex_normal_correct(vh, n);
+		this->set_normal(vh, glm::normalize(n));
+	}
+}
diff --git a/game/geoData.h b/game/geoData.h
index 3141dbe..d4d0fb3 100644
--- a/game/geoData.h
+++ b/game/geoData.h
@@ -10,10 +10,10 @@
 #include <thirdparty/openmesh/glmcompat.h>
 
 struct GeoDataTraits : public OpenMesh::DefaultTraits {
-	FaceAttributes(OpenMesh::Attributes::Normal | OpenMesh::Attributes::Status);
+	FaceAttributes(OpenMesh::Attributes::Status);
 	EdgeAttributes(OpenMesh::Attributes::Status);
 	VertexAttributes(OpenMesh::Attributes::Normal | OpenMesh::Attributes::Status);
-	HalfedgeAttributes(OpenMesh::Attributes::Normal | OpenMesh::Attributes::Status);
+	HalfedgeAttributes(OpenMesh::Attributes::Status);
 	using Point = GlobalPosition3D;
 	using Normal = Normal3D;
 };
@@ -105,6 +105,8 @@ protected:
 	[[nodiscard]] bool triangleContainsPoint(const GlobalPosition2D, FaceHandle) const;
 	[[nodiscard]] HalfedgeHandle findBoundaryStart() const;
 
+	void update_vertex_normals_only();
+
 private:
 	GlobalPosition3D lowerExtent {}, upperExtent {};
 };