It's Portal but now with ray-traced cake.
Portal with RTX

Nvidia's GTC keynote earlier today contained news about the new (and very expensive) 40-series of RTX cards. In addition, the company also announced Portal with RTX. As you can probably assume from its name, this is an RTX-enhanced version of the classic puzzle game from Valve.

Portal with RTX includes updated visuals along with real-time ray tracing. It seems as though a bulk of the grunt work on Portal with RTX is being handled by Nvidia themselves. They previously worked on and released RTX versions of Quake II and Minecraft.

More interesting here is the reveal that Nvidia used a tool called RTX Remix in order to make Portal with RTX. This tool will be made available to the public for free. This means that other studios or would-be developers can use this tool to create their own RTX-enhanced games. Nvidia even showed off adding RTX to The Elder Scrolls III: Morrowind.

RTX Remix is able to capture the textures, geometry, lighting, and cameras thanks to an innovative, custom D3D9 Runtime called the RTX Remix Runtime. Classic games like Morrowind use the D3D9 runtime to send draw calls (rendering instructions) to the GPU. RTX Remix Runtime intercepts those draw calls, interprets them into distinct assets, and reassembles those assets into an identical scene. From there, RTX Remix converts the assets and scene into the widely adopted Universal Scene Description (USD) open 3D framework, which is the foundation of the NVIDIA Omniverse platform for building and operating custom 3D pipelines.
RTX Remix also seems like it is capable of simplifying the process of remastering art assets. It can help upscale textures up to 4X, as well as adding normal maps, and adding physically based rendering (PBR) properties to assets. These steps, which are needed for adding ray tracing, are all handled through AI processing within RTX Remix.

Back to the topic at hand though: Portal was originally released in 2007. Portal with RTX will be a free release to everyone that owns Portal, which is probably most everyone in the world at this point since it's been dirt cheap and has often been given away for free. The expected release of Portal with RTX is "November." If you want a reminder about its release, you can add Portal with RTX to your Steam Wishlist now.

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Portal with RTX is a free DLC for all Portal owners developed by NVIDIA Lightspeed Studios. Experience the critically acclaimed and award-winning Portal™ reimagined with ray tracing. Every frame of gameplay is upgraded with stunning full ray tracing, new, hand-crafted hi-res physically based textures, and new, enhanced high-poly models evocative of the originals, all in stunning 4K. In Portal with RTX, full ray tracing transforms each level, enabling light to bounce and be affected by the scene’s geometry and materials. Every light is ray-traced and casts shadows, global illumination indirect lighting naturally illuminates and darkens rooms, volumetric ray-traced lighting scatters through fog and smoke, and shadows are pixel perfect. Portal with RTX is compatible with all ray-tracing capable GPUs.