From 1117f91396da00fc48158866ff0ffd1883c4cbd1 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Thu, 2 Nov 2023 20:37:08 +0000
Subject: Generic N-dimensional terrain triangle

---
 game/terrain2.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/game/terrain2.h b/game/terrain2.h
index 641d608..c2c3d19 100644
--- a/game/terrain2.h
+++ b/game/terrain2.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "collections.h" // IWYU pragma: keep IterableCollection
 #include <OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh>
 #include <filesystem>
 #include <glm/vec2.hpp>
@@ -41,6 +42,19 @@ public:
 		mutable FaceHandle _face {};
 	};
 
+	template<glm::length_t Dim> struct Triangle : public glm::vec<3, glm::vec<Dim, glm::vec2::value_type>> {
+		using base = glm::vec<3, glm::vec<Dim, glm::vec2::value_type>>;
+		using base::base;
+
+		template<IterableCollection Range> Triangle(const TerrainMesh * m, Range range)
+		{
+			assert(std::distance(range.begin(), range.end()) == 3);
+			std::transform(range.begin(), range.end(), &base::operator[](0), [m](auto vh) {
+				return m->point(vh);
+			});
+		}
+	};
+
 	[[nodiscard]] FaceHandle findPoint(glm::vec2) const;
 	[[nodiscard]] FaceHandle findPoint(glm::vec2, FaceHandle start) const;
 
-- 
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