From eee7e7ae1e91e42561e1a2b5bec448f04c2b2298 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 24 Nov 2024 00:46:03 +0000
Subject: Add Triangle::centroid

---
 game/geoData.h | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/game/geoData.h b/game/geoData.h
index 51bb28b..c28dd14 100644
--- a/game/geoData.h
+++ b/game/geoData.h
@@ -53,7 +53,8 @@ public:
 	};
 
 	template<glm::length_t Dim> struct Triangle : public glm::vec<3, glm::vec<Dim, GlobalDistance>> {
-		using base = glm::vec<3, glm::vec<Dim, GlobalDistance>>;
+		using Point = glm::vec<Dim, GlobalDistance>;
+		using base = glm::vec<3, Point>;
 		using base::base;
 
 		template<IterableCollection Range> Triangle(const GeoData * m, Range range)
@@ -64,12 +65,20 @@ public:
 			});
 		}
 
-		[[nodiscard]] glm::vec<Dim, GlobalDistance>
+		[[nodiscard]] Point
 		operator*(BaryPosition bari) const
 		{
 			return p(0) + (difference(p(0), p(1)) * bari.x) + (difference(p(0), p(2)) * bari.y);
 		}
 
+		[[nodiscard]] Point
+		centroid() const
+		{
+			return [this]<glm::length_t... axis>(std::integer_sequence<glm::length_t, axis...>) {
+				return Point {(p(0)[axis] + p(1)[axis] + p(2)[axis]) / 3 ...};
+			}(std::make_integer_sequence<glm::length_t, Dim>());
+		}
+
 		[[nodiscard]] auto
 		area() const
 			requires(Dim == 3)
-- 
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