From 68c6f6c9f881add15b6f3bae04c2eb719df6078c Mon Sep 17 00:00:00 2001
From: josh <josh@stepbro.wtf>
Date: Wed, 10 Jul 2024 14:19:16 -0400
Subject: [PATCH] Implement Polygon::ToPolyhedron

---
 include/J3ML/Geometry/Polygon.h |  8 ++++++++
 src/J3ML/Geometry/Polygon.cpp   | 17 +++++++++++++++--
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/include/J3ML/Geometry/Polygon.h b/include/J3ML/Geometry/Polygon.h
index 94342cf..ff4ffed 100644
--- a/include/J3ML/Geometry/Polygon.h
+++ b/include/J3ML/Geometry/Polygon.h
@@ -80,6 +80,14 @@ namespace J3ML::Geometry {
         Vector3 ClosestPoint(const LineSegment &lineSegment, Vector3 *lineSegmentPt) const;
 
         Vector3 ClosestPoint(const Vector3 &point) const;
+
+        /// Converts this Polygon to a Polyhedron representation.
+        /** This function will create a Polyhedron with two faces, one for the front face of this Polygon,
+            and one for the back face.
+            @todo Add ToPolyhedron(float polygonThickness)
+            @see Triangulate(), MinimalEnclosingAABB(). */
+        Polyhedron ToPolyhedron() const;
+
     protected:
 
 
diff --git a/src/J3ML/Geometry/Polygon.cpp b/src/J3ML/Geometry/Polygon.cpp
index 96fa400..62017c0 100644
--- a/src/J3ML/Geometry/Polygon.cpp
+++ b/src/J3ML/Geometry/Polygon.cpp
@@ -1,9 +1,9 @@
 #include <J3ML/Geometry/Polygon.h>
-#include <J3ML/Geometry/AABB.h>
+#include <J3ML/Geometry/AABB.hpp>
 #include <J3ML/Geometry/Triangle.h>
 #include "J3ML/Geometry/Plane.h"
 #include "J3ML/Geometry/Line.h"
-#include <J3ML/Algorithm/GJK.h>
+#include <J3ML/Algorithm/GJK.hpp>
 
 namespace J3ML::Geometry {
     Vector3 Polygon::AnyPointFast() const { return !vertices.empty() ? vertices[0] : Vector3::NaN; }
@@ -572,6 +572,19 @@ namespace J3ML::Geometry {
         return closestPt;
     }
 
+    Polyhedron Polygon::ToPolyhedron() const {
+        Polyhedron poly;
+        poly.v = vertices;
+        poly.f.push_back(Polyhedron::Face());
+        poly.f.push_back(Polyhedron::Face());
+        for(int i = 0; i < NumVertices(); ++i)
+        {
+            poly.f[0].v.push_back(i);
+            poly.f[1].v.push_back(NumVertices()-1-i);
+        }
+        return poly;
+    }
+
     Vector3 Polygon::ClosestPoint(const LineSegment &lineSegment) const
     {
         return ClosestPoint(lineSegment, 0);