actually add vendor folder

vendor/raylib-cpp/examples/models/models_billboard.cpp

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+/*******************************************************************************************
+*
+*   raylib [models] example - Drawing billboards
+*
+*   This example has been created using raylib 1.3 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2015 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib-cpp.hpp"
+
+int main() {
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    raylib::Window window(screenWidth, screenHeight, "raylib [models] example - drawing billboards");
+
+    // Define the camera to look into our 3d world
+    raylib::Camera camera(
+        raylib::Vector3(5.0f, 4.0f, 5.0f),
+        raylib::Vector3(0.0f, 2.0f, 0.0f),
+        raylib::Vector3(0.0f, 1.0f, 0.0f),
+        45.0f,
+        CAMERA_PERSPECTIVE);
+
+    raylib::Texture2D bill("resources/billboard.png");     // Our texture billboard
+    raylib::Vector3 billPosition(0.0f, 2.0f, 0.0f);                // Position where draw billboard
+
+    SetTargetFPS(60);                       // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!window.ShouldClose()) {    // Detect window close button or ESC key
+        // Update
+        //----------------------------------------------------------------------------------
+        camera.Update(CAMERA_ORBITAL);              // Update camera
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+        {
+            window.ClearBackground(RAYWHITE);
+
+            camera.BeginMode();
+            {
+                DrawGrid(10, 1.0f);        // Draw a grid
+                bill.DrawBillboard(camera, billPosition, 2.0f);
+            }
+            camera.EndMode();
+
+            DrawFPS(10, 10);
+        }
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    return 0;
+}

vendor/raylib-cpp/examples/models/models_first_person_maze.cpp

@@ -0,0 +1,118 @@
+/*******************************************************************************************
+*
+*   raylib [models] example - first person maze
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib-cpp.hpp"
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    raylib::Window window(screenWidth, screenHeight, "raylib [models] example - first person maze");
+
+    // Define the camera to look into our 3d world
+    raylib::Camera camera({ 0.2f, 0.4f, 0.2f }, { 0.0f, 0.0f, 0.0f }, { 0.0f, 1.0f, 0.0f }, 45.0f);
+
+    raylib::Image imMap("resources/cubicmap.png");      // Load cubicmap image (RAM)
+    raylib::Texture cubicmap(imMap);                    // Convert image to texture to display (VRAM)
+    raylib::MeshUnmanaged mesh = raylib::MeshUnmanaged::Cubicmap(imMap, Vector3{ 1.0f, 1.0f, 1.0f });     // Use MeshUnmanaged, Mesh will be handled by Model
+    raylib::Model model(mesh);
+
+    // NOTE: By default each cube is mapped to one part of texture atlas
+    raylib::Texture texture("resources/cubicmap_atlas.png");    // Load map texture
+    model.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;     // Set map diffuse texture
+
+    // Get map image data to be used for collision detection
+    Color *mapPixels = imMap.LoadColors();
+
+    imMap.Unload();                   // Unload image from RAM
+
+    raylib::Vector3 mapPosition(-16.0f, 0.0f, -8.0f);   // Set model position
+    raylib::Vector3 playerPosition(camera.position);    // Set player position
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!window.ShouldClose()) {    // Detect window close button or ESC key
+        // Update
+        //----------------------------------------------------------------------------------
+        raylib::Vector3 oldCamPos(camera.position);    // Store old camera position
+
+        camera.Update(CAMERA_FIRST_PERSON);        // Update camera
+
+        // Check player collision (we simplify to 2D collision detection)
+        raylib::Vector2 playerPos(camera.position.x, camera.position.z);
+        float playerRadius = 0.1f;  // Collision radius (player is modelled as a cilinder for collision)
+
+        int playerCellX = static_cast<int>(playerPos.x - mapPosition.x + 0.5f);
+        int playerCellY = static_cast<int>(playerPos.y - mapPosition.z + 0.5f);
+
+        // Out-of-limits security check
+        if (playerCellX < 0) playerCellX = 0;
+        else if (playerCellX >= cubicmap.width) playerCellX = cubicmap.width - 1;
+
+        if (playerCellY < 0) playerCellY = 0;
+        else if (playerCellY >= cubicmap.height) playerCellY = cubicmap.height - 1;
+
+        // Check map collisions using image data and player position
+        // TODO: Improvement: Just check player surrounding cells for collision
+        for (int y = 0; y < cubicmap.height; y++)
+        {
+            for (int x = 0; x < cubicmap.width; x++)
+            {
+                if ((mapPixels[y*cubicmap.width + x].r == 255) &&       // Collision: white pixel, only check R channel
+                    (playerPos.CheckCollisionCircle(playerRadius,
+                    Rectangle{ mapPosition.x - 0.5f + x*1.0f, mapPosition.z - 0.5f + y*1.0f, 1.0f, 1.0f })))
+                {
+                    // Collision detected, reset camera position
+                    camera.position = oldCamPos;
+                }
+            }
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+        {
+            window.ClearBackground(RAYWHITE);
+
+            camera.BeginMode();
+            {
+                model.Draw(mapPosition);               // Draw maze map
+                // playerPosition.DrawCube((Vector3){ 0.2f, 0.4f, 0.2f }, RED);  // Draw player
+            }
+            camera.EndMode();
+
+            cubicmap.Draw(Vector2{ static_cast<float>(GetScreenWidth() - cubicmap.width*4 - 20), 20 }, 0.0f, 4.0f, WHITE);
+            DrawRectangleLines(GetScreenWidth() - cubicmap.width*4 - 20, 20, cubicmap.width*4, cubicmap.height*4, GREEN);
+
+            // Draw player position radar
+            DrawRectangle(GetScreenWidth() - cubicmap.width*4 - 20 + playerCellX*4, 20 + playerCellY*4, 4, 4, RED);
+
+            DrawFPS(10, 10);
+        }
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+
+    UnloadImageColors(mapPixels);          // Unload color array
+
+    //----------------------------------------------------------------------------------
+
+    return 0;
+}