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diff --git a/eyeware-beam-sdk/API/cpp/include/eyeware/geometry.h b/eyeware-beam-sdk/API/cpp/include/eyeware/geometry.h
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+++ b/eyeware-beam-sdk/API/cpp/include/eyeware/geometry.h
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+/**
+ * Copyright and confidentiality notice
+ *
+ * This file is part of GazeSense SDK, which is proprietary and confidential
+ * information of Eyeware Tech SA.
+ *
+ * Copyright (C) 2020 Eyeware Tech SA
+ *
+ * All rights reserved
+ */
+
+#ifndef EYEWARE_SDK_GEOMETRY_H
+#define EYEWARE_SDK_GEOMETRY_H
+
+#include <cstdint>
+#include <limits>
+#include <memory>
+
+#include "defines.h"
+
+namespace eyeware {
+
+/**
+ * Matrix of 3x3, implemented as an array of arrays (row-major).
+ *
+ * \code{.cpp}
+ * Matrix3x3 my_matrix; // Assume a Matrix3x3 instance is available
+ * int row = 1;
+ * int col = 2;
+ * float coefficient = my_matrix[row][col];
+ * \endcode
+ *
+ */
+using Matrix3x3 = float[3][3];
+
+/**
+ * Representation of a 2D vector or 2D point.
+ */
+struct Vector2D {
+    /**
+     * x coordinate
+     */
+    float x = 0.0f;
+    /**
+     * y coordinate
+     */
+    float y = 0.0f;
+};
+
+/**
+ * Representation of a 3D vector or 3D point.
+ */
+struct Vector3D {
+    /**
+     * x coordinate.
+     */
+    float x = 0.0f;
+    /**
+     * y coordinate.
+     */
+    float y = 0.0f;
+    /**
+     * z coordinate.
+     */
+    float z = 0.0f;
+};
+
+/**
+ * Representation of a 3D affine transform, composed by a rotation matrix and a translation vector
+ * as A = [R | t], where
+ *
+ * R = [c_00, c_01, c_02
+ *      c_10, c_11, c_12
+ *      c_20, c_21, c_22],
+ *
+ * t = [c_03,
+ *      c_13,
+ *      c_23].
+ * */
+struct AffineTransform3D {
+    /**
+     * Rotation matrix component.
+     */
+    Matrix3x3 rotation;
+    /**
+     * Translation vector component.
+     */
+    Vector3D translation;
+};
+
+struct Size2D {
+    float width;
+    float height;
+};
+
+struct Rectangle {
+    uint32_t top_left_x;
+    uint32_t top_left_y;
+    uint32_t width;
+    uint32_t height;
+};
+
+/**
+ * Defines a ray which is a subset of a line, given by the following equation:
+ *
+ * x = o + d(t), for t in [0, +oo[ and ||d|| = 1.
+ *
+ * Where o denotes the origin, d denotes the direction, t is any given
+ * constant between 0 and infinity that denotes the distance from the origin
+ * to a point x.
+ */
+struct Ray3D {
+    Vector3D origin;
+    Vector3D direction;
+};
+
+enum class Orientation {
+    UNKNOWN = 0,
+    CLOCKWISE_0 = 1,
+    CLOCKWISE_90 = 2,
+    CLOCKWISE_180 = 3,
+    CLOCKWISE_270 = 4
+};
+
+} // namespace eyeware
+
+#endif // EYEWARE_SDK_GEOMETRY_H