diff --git a/helloRay.cpp b/helloRay.cpp
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+++ b/helloRay.cpp
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+/**
+  Raycasting hello world program for Pokitto, using raycastlib.
+
+  author: Miloslav "drummyfish" Ciz
+  license: CC0 1.0
+*/
+
+#define PIXEL_FUNCTION pixelFunc
+/* ^ Before including raycastlib, this has to be set to the name of the
+     function that will render pixels. It allows super performance. */
+
+/* There are many other options that can be defined here, check the library
+   for details. */
+
+#include "raycastlib.h"
+#include "Pokitto.h"
+
+Pokitto::Core pokitto;
+
+Camera camera; // Defines a view that will be rendered.
+
+// Function that for given square coordinates returns height of the floor.
+Unit floorHeightAt(int16_t x, int16_t y)
+{
+  return x < 0 || x >= 10 || y < 0 || y >= 10 ?
+    UNITS_PER_SQUARE * 2 : 0;
+    // ^ UNITS_PER_SQUARE is the length of one side of the game world square.
+}
+
+// Function which the library will call to draw indivifual pixels.
+void pixelFunc(PixelInfo *pixel)
+{
+  uint8_t color;
+
+  /* Pixel holds all kind of info about the pixel to be rendered. Check
+     the PixelInfo struct for details. */
+
+  if (pixel->isWall)
+    color = pixel->hit.direction + 2;
+  else
+    color = pixel->isFloor ? 10 : 11;
+
+  pokitto.display.drawPixel(pixel->position.x,pixel->position.y,color);
+}
+
+void draw()
+{
+  RayConstraints c;
+
+  c.maxHits = 1;
+  c.maxSteps = 20;
+
+  /* This triggers the rendering, which will keep calling pixelFunc to render
+     the camera view. */
+  renderSimple(camera,floorHeightAt,0,0,c);
+}
+
+int main()
+{
+  pokitto.begin(); 
+  pokitto.setFrameRate(60);
+
+  initCamera(&camera);
+
+  // Set the camera position to square [4;6].
+  camera.position.x = 4 * UNITS_PER_SQUARE;
+  camera.position.y = 6 * UNITS_PER_SQUARE;
+
+  camera.height = UNITS_PER_SQUARE;
+
+  // Set the camera resolution to Pokitto display resolution.
+  camera.resolution.x = 110;
+  camera.resolution.y = 88;
+
+  while (pokitto.isRunning())
+  {
+    if (pokitto.update())
+    {
+      draw();
+      camera.direction -= 10; // Rotate camera for some animation.
+    }
+  }
+
+  return 0;
+}