Analysis and optimization of ue5 global illumination system lumen

Global illumination Global illumination (GI), Also called indirect illumination , It refers to a series of methods that make the lighting of computer scenes more realistic and natural 3D Graphic algorithm . Popular speaking , That is, when the computer is rendering graphics , Not only the light that directly shines on the surface of the object from the light source , Also consider the light reflected from other surfaces to the current surface , So as to greatly increase the realism of the scene .

In the real world , It's easy for us to observe GI Related phenomena , For example, when the sun shines on the ground from the cave entrance, it will reflect and light up other places in the cave , When the light shines on the red sofa, it will cause the red light to reflect on the wall behind it, etc .

The technique corresponding to global photometry is called direct illumination （ Or partial illumination , As shown on the left of the above figure ）, The light comes out from the light source and stops immediately when it touches the object , No multiple reflections . In earlier studies , Due to hardware limitations, etc , We tend to adopt a more empirical approach to modeling and simulating local illumination （ Such as Phong and Blinn-Phong Model ）. But this passage Hack The effect of the method is obviously not real and natural , As a result, many games will give players an indescribable sense of disobedience .

And on the other hand , Although the global illumination effect is ideal , But because of the need to do a lot of calculation for the bounce of light , For a long time, it can only be used for CG、 In the field of non real time rendering, such as movies .

However, with the progress of hardware technology and the efforts of medical researchers in the graphics field , Relevant papers and achievements emerge in endlessly . In modern game engines GI Also from the early pre - computed global illumination technology （ The light map Lightmap、 Light probe Light Probe）, Gradually developed and produced UE5 Lumen This is an excellent dynamic global illumination technology , It has brought new technological changes to the industry .

In this issue IncrediClub Special session for game developers , The online Technology Salon will focus on the topic of global illumination ——

《UE5 Global lighting system Lumen Analysis and optimization 》6 month 23 Japan 20:00

From home Top5 Game studio senior Engine Development Engineer Five dust Focus on UE5 Global lighting system in Lumen And discuss the technology optimization method .

Participate in this activity and you will gain ：

• • Main stream Of GI(Global illumination) programme

  • UE5 GI System Lumen Analysis and technical optimization of

  • GI The future of Technology

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