From a007ffeed3cfa6af2cbe1053c330ad11927d58de Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 18 Dec 2024 17:24:02 +0000
Subject: Add sanity checking logic to GeoData

---
 lib/triangle.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lib/triangle.h')

diff --git a/lib/triangle.h b/lib/triangle.h
index 888481d..d5547ab 100644
--- a/lib/triangle.h
+++ b/lib/triangle.h
@@ -83,6 +83,14 @@ struct Triangle : public glm::vec<3, glm::vec<Dim, T, Q>> {
 		return 0.F;
 	}
 
+	[[nodiscard]] constexpr auto
+	isUp() const
+	{
+		const auto edgeAB = sideDifference(1);
+		const auto edgeAC = sideDifference(2);
+		return edgeAB.x * edgeAC.y >= edgeAB.y * edgeAC.x;
+	}
+
 	[[nodiscard]] constexpr auto
 	p(const glm::length_t idx) const
 	{
-- 
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