From b222c21715384efc2eaa53d3ba295fb34da5b599 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 9 Apr 2023 12:24:55 +0100
Subject: Start to factor out geometric place from face controller split

---
 lib/geometricPlane.cpp |  9 +++++++++
 lib/geometricPlane.h   | 12 ++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 lib/geometricPlane.cpp
 create mode 100644 lib/geometricPlane.h

(limited to 'lib')

diff --git a/lib/geometricPlane.cpp b/lib/geometricPlane.cpp
new file mode 100644
index 0000000..cb52997
--- /dev/null
+++ b/lib/geometricPlane.cpp
@@ -0,0 +1,9 @@
+#include "geometricPlane.h"
+#include <glm/geometric.hpp>
+
+GeometricPlane::PlaneRelation
+GeometricPlane::getRelation(glm::vec3 p) const
+{
+	const auto d = glm::dot(normal, p - origin);
+	return d < 0.f ? PlaneRelation::Below : d > 0.f ? PlaneRelation::Above : PlaneRelation::On;
+}
diff --git a/lib/geometricPlane.h b/lib/geometricPlane.h
new file mode 100644
index 0000000..96816f2
--- /dev/null
+++ b/lib/geometricPlane.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <glm/vec3.hpp>
+
+class GeometricPlane {
+public:
+	enum class PlaneRelation { Above, Below, On };
+
+	glm::vec3 origin, normal;
+
+	PlaneRelation getRelation(glm::vec3 point) const;
+};
-- 
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