Witcher 3: Wild Hunt GDC presentation slides & footage reveal world-building tech

Thursday, 10th April 2014 12:14 GMT By Dave Cook

The Witcher 3: Wild Hunt engine programmer Przemysław Czatrowski held a panel session at GDC last month that looked at how the team used Umbra 3 middleware to construct the game’s sprawling open world.

The panel, was titled, ‘Solving Visibility and Streaming in the The Witcher 3: Wild Hunt with Umbra 3,’ and explained that by using Umbra Software’s tech, CD Projekt RED reduced graphic card load by rendering only visible objects in the world. It sounds a bit like what id Software did in Rage.

CD Projekt’s GDC presentation slides are now available in full here, along with a full recording of the session.

The process sees the world divided into tiles, each with its own ‘tome’ of data that includes the occlusion data necessary to make it work. Then, the engine assesses which of those tomes are needed to properly display the world depending on where the camera is pointing, and an asynchronous mechanic kicks in once the parameters change, and the old tome is discarded to free up your system’s memory.

Here’s a video of the tech at work:

For example, here’s an in-game shot of Geralt in Novigrad, and a look at what is being rendered from above:



DualShockers has many more details on the intricate process in its report. Hit it up.



  1. KAP

    When are they gonna release the 40min demo from E3 last year for flip sake.. what are they playing it?!
    That footage will freak gamers across the world the fuck out once they see it, trust me!

    #1 8 months ago
  2. Booraz

    @KAP Probably never. I think we will see a new presentation, more polished one, showing of different part of the game. I hopw we will see it during E3 or Gamescom

    #2 8 months ago
  3. DarkElfa

    This game looks amazing, I need my RPG fix.

    #3 8 months ago

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