Add a structure representing an explicit mesh

Mesh.cpp

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+#include "Mesh.h"
+
+

Mesh.h

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+/**
+ * Defines a mesh, ready to be OpenGL-rendered
+ **/
+
+#include <vector>
+#include "common_structures.h"
+
+class Mesh {
+    public:
+        Mesh();
+
+        /// Adds a fresh vertice at `pt`, and returns its ID for further use
+        size_t add_vertice(const Point& pt);
+
+        /// Creates a new face out of the three given point IDs
+        void add_face(const Face& face);
+        void add_face(size_t f1, size_t f2, size_t f3);
+
+        /// Gets the various vertices
+        const std::vector<Point>& get_vertices() const;
+
+        /// Gets the various faces
+        const std::vector<Face>& get_faces() const;
+
+    private:
+        std::vector<Point> vertices;
+        std::vector<Face> faces;
+};

common_structures.h

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+/**
+ * Defines a few widely used, widely spread structures. Imported pervasively.
+ **/
+
+struct Point {
+    double x, y, z;
+};
+
+struct Face {
+    int vert[3];
+    int operator[](unsigned i) {
+        return vert[i % 3]; // dodge errors
+    }
+};