Crysis is legendary, seared into the mind of a PC generation - but one chapter of the saga is at best neglected, at worst all but forgotten. Crysis Warhead is a PC exclusive standalone, released just under a year after the original, unclouded by the change of ambition and setting brought about by the multi-platform orientated Crysis 2. With Crysis Remastered looming on the horizon, we wanted to look back at the game, to get a handle on its successes and failures and to answer the question: why is Crysis Warhead so often overlooked?

Warhead is both a continuation and an expansion for the original release but also a response to its many criticisms. Firstly, in terms of design, it attempts to address core criticisms to the gameplay of Crysis itself. While I may personally look back at the original game in its entirety rather fondly, a number of players and reviewers disliked the last third of the game, where you engage the alien threat in a more linear fashion. The freeform 'wide linear' gameplay Crysis was feted for was all but forgotten, while the aliens themselves were perhaps rather one-note.

Then there were the technical challenges in running the game that became the series' hallmark. Beyond gameplay critiques, Crysis' lofty system requirements and ultra-high end graphics didn't go down well with users and reviewers of the time, to the point where even one of the best cards of the era - the GeForce 8800 GT - could struggle. Indeed, even turning up graphics to very high didn't deliver a playable experience on any but the most powerful 8800 GTX or SLI set-ups back in 2007. Even then, a number of levels strained the CPU due to Crysis being a very single-threaded game - even with overclocks, CPUs like the Q6600 would struggle to do much on the highest settings in levels like Ascension. Indeed, as we've demonstrated in the past, even modern PCs with top-tier processors have a hard time delivering consistent performance.

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The arrival of Nvidia's RTX line of graphics cards may not have immediately ushered in a new era of games built around the concept of ray traced rendering but it has put the technique on the map, with results impressive enough to inspire developers to add ray traced effects to existing games - several of which do not actually require Nvidia hardware acceleration. We recently looked at a stunning path traced version of Minecraft, but what if RT techniques could be applied to all DirectX9 and DirectX11 games? And what happens if we apply that new technology to classic PC mangler, Crysis? Watch the video embedded on this page and you'll see that it works to a transformative degree - albeit with limitations.

It's all because of a new extension currently in development for the powerful post-process injection tool, Reshade, created by modding veteran and Nvidia Ancel contributor, Pascal Gilcher. Reshade works by hooking into DirectX, accessing the data contained in the depth and colour buffers to accomplish a range of post-process effects, including SMAA anti-aliasing, screen-space reflections, depth of field and colour tints to name but a few. A new ray tracing feature is now available in alpha builds - and strictly speaking, this adds a new layer of global illumination derived from path tracing. It's not a full fat implementation as we saw in Minecraft, but it can have a transformative effect - particularly on titles like the original Crysis, created at a time when the way games were lit was somewhat na ve compared to modern day implementations.

Crysis was a pioneer for screen-space ambient occlusion (SSAO) which uses data from the depth buffer to add shade to the nooks and crannies on-screen. The technique has evolved constantly over the last decade, but path traced global illumination can take this to the next level: Reshade beams out three rays per pixel in calculating shade and light bounce - giving a new layer of accuracy and depth to the way the scene is lit. Take a look at the video below and you'll see a number of A to B comparisons that reveal a stark difference.

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