My first commercial projects - two games for Gameboy Advance Platform. I list them together because they share engine and graphics style. Phantom, however was a fast paced action adventure game, while Mandrake had many RPG elements.

At that time I worked at Italian company 7th Sense. Both games have been created from the scratch in about 8 months. Unfortunately, just before the release our publisher got into some financial troubles and canned both projects. Still think it's shame because they were really something at that time. On the left you can see example of chained barrel explosion.

I was responsible for most of the game related code. This meant everything except the UI and low-level engine. Things I was most proud of were optimized A* path-finding system and scripting language. We allowed about 10 NPCs at the same time and it worked smoothly at ~16MHz machine. The scripting system was really simple assembler-like, event-based, but it allowed our designers to create things I'd never thought about (my favourite were Indiana Jones style stone chasing the hero in one of the dungeons and boss fights).

Mandrake was a little bit more complicated because of his unique spells (but he couldnt use a machine gun :). He could, for example, summon his astral body and sneak around in this form, walk through the walls etc. I left 7th Sense in January of 2003, but I still have fond memories of the company, it was a great and very gentle start in the industry (almost no overtime! \o/).

WWII - PH was rather simple (done in 4-5 months) arcade game. I wasnt a member of game team, but it uses parts of my engine.

I was responsible for game object system, collision system, AI, parts of user interface (radars, HUDs etc). I co-authored a system for defining and controlling missions (in Lua, based on coroutines).

My second project at City, more complicated one. Initially, it was supposed to be a space RTS (think Homeworld), but it morphed to space shooter.

PF uses modified and enhanced WWII-PH engine. Things I spent most time on were collision system and group behaviours. Collision system had to handle potential collisions between thousands of objects in 3D space (you could collide with any object in space and push it, so that it collided with another). I experimented with various algorithms and narrowed choice to loose octrees and sweep-and-prune (final implementation uses loose octrees).

For realistic squad behaviors I employed boids algorithm (as described by Craig Reynolds). I had to modify it so that ships move in organized formations rather than as flock of birds. Other than guarding it's formation position each ship had some typical goals that could override the basic ones like chasing opponents, avoiding obstacles and so on. For this game I also had to implement AI for other kinds of objects like ground turrets and mech walkers (they used flocking algorithms as well).

In January 2004 I moved to another Polish company - CD Projekt Red Studio (now known as CD Projekt Red) to join The Witcher team. It's the biggest game project in Poland - a RPG game based on the stories of the most famous Polish fantasy writer - Andrzej Sapkowski.

The Witcher uses heavily modified version of Aurora engine by Bioware (used in Neverwinter Nights). We rewrote most of the components, I think only sound system wrapper, scripting language (Neverwinter Script) and parts of resource manager were untouched. (early shot on the right)

Other notable 3rd part libraries include SpeedTree for vegetation, Karma for physics (ragdolls, rigid bodies) and Miles Sound System. I started as tools programmer and my biggest tasks were porting Aurora Toolset to DirectX and coding Cutscene Editor. Currently we're creating our own toolset chain in Microsoft Visual C++ (Aurora Toolset is in Borland C++ Builder).

Later my role changed to 3D/gameplay programmer. I implemented dynamic soft shadows system, volumetric fog, normal/parallax mapping, optimized  light manager, resource caching and visibility determination system based on portals, anti-portals and BSP trees. In the "spare" time I worked on low-level/system functionality like crash reporters, stack tracers, memory management.

Since May 2005 I've been working as a Lead Gameplay Programmer. My additional responsibilites include leading team of 4 other programmers and providing most of the gameplay related solutions. Recently I've been working on a new AI system (mix between scripted and emergent AI). The Witcher has been released in November 2007 and turned out to be a success, especially for a game done with relatively unexperienced team. We've collected pretty much 100% of PC RPG Awards (usually beating Mask of the Betrayer by Obsidian veterans), some general RPG (beating Mass Effect) and even some PC Exclusive GOTY of 2007 (usually in front of Crysis). All in all - great feeling after 4 years of hard work.  Proud of my team and personally I'm satisfied with the 'living cities' system I implemented which has been generally praised in reviews.

Some of the most notable awards we've gotten so far:

Gamespy's PC RPG of the Year IGN's Best PC RPG/Best Original Score Voodoo Extreme's Best PC Exclusive  Game, Best Computer RPG GameBanshee's RPG of the Year Gaming Heaven Game of the Year RPGamer  PC RPG of the Year Gamespot Readers' Choice Winner - Best RPG PC Gamer - RPG of the Year

After some weeks of regeneration we started to working on Enhanced Edition of The Witcher. I spent 5 months on this and it was rather hard work, mainly fixing some obscure Heisenbugs happening once in a blue moon and trying to take memory management under control.  Thanks to my MemTracer tool I managed to cut down memory consumption by 20%, improve usage patterns and remove some nasty leaks. On top of that I optimized our loading process, speeding it up by ~80% and reducing size of loaded data (second fix was one of the most awaited and crucial points of EE, I implemented basic version in the very first patch and sped it up even more later). In 2010, IGN selected The Witcher as one of the 25 best modern PC games (last decade give or take), in big part thanks to EE.

Some of my demoscene work (1994-2001) can be found here.

I also coded one game for mobile phones (Super Table Soccer, published by Overloaded) and ported over 20 titles to various phone models.
Some screens from Super Table Soccer: