Tag: VR

VR下左右眼UI排序不一样

By sc1991327 All, VR Rendering

    首先确认问题出在哪里：经过测试只有出现在 SolarMeshWidgetComponent 这个相关。     然后想了一下，有可能是是左右眼的深度处理不一致，有这样的情况么？ 可能一： https://answers.unrealengine.com/questions/88032/bug-fresnel-on-vr-oculus-lr-eye-different.html https://forums.unrealengine.com/showthread.php?45945-Translucent-Water-Material-Displacement-Banding-Issue CameraVector. This is the world space camera direction. Since virtual reality glasses use 2 separate camera’s ingame, with both a slightly different direction, you won’t get the same result.     有遇到相似的左右眼不一致的情况有如下： Fresnel 效果不一致： https://answers.unrealengine.com/questions/88032/bug-fresnel-on-vr-oculus-lr-eye-different.html LOD 效果不一致： https://answers.unrealengine.com/questions/584083/eyes-sometimes-show-different-lods-in-vr.html     解决方案：根据actor到摄像机的距离手动排序      
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Oculus Optimizing the Unreal Engine 4 Renderer for VR

By sc1991327 All, VR, VR Rendering

https://developer.oculus.com/blog/introducing-the-oculus-unreal-renderer/     For Farlands, the Oculus team wrote an experimental, fast, single-pass forward renderer for Unreal Engine. It’s also used in Dreamdeck and the Oculus Store version of Showdown. We’re sharing the renderer’s source as a sample to help developers reach higher quality levels and frame rates in their own applications. As of today,
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The Vanishing of Milliseconds: Optimizing the UE4 renderer for Ethan Carter VR

By sc1991327 All, VR, VR Rendering

原文： https://medium.com/@TheIneQuation/the-vanishing-of-milliseconds-dfe7572d9856#.auamge3rg         As a game with very rich visuals, The Vanishing of Ethan Carter (available for the  Oculus Rift and Steam VR ) has been a difficult case for hitting the VR performance targets. The fact that its graphics workload is somewhat uncommon for Unreal Engine 4 (and, specifically, largely dissimilar to existing
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Advanced VR Rendering Performance

By sc1991327 All, VR, VR Rendering

作者： Alex Vlachos ValveAlex@ValveSoftware.com 这是全文的第二部分，第一部分在GDC 15的时候讲的，下面是链接： Video and slides from last year are free online: http://www.gdcvault.com/play/1021771/Advanced-VR 全篇目标就是：VR渲染如何在保证质量的前提下获得最好的性能。 全文分为四部分： Multi-GPU for VR 这一点主要考虑的方向就是GPU硬件对于性能的提升。 首先回顾上一篇有讲到隐藏网格区域，指的就是对于最后渲染buffer的不会看到的部分位置的像素点不渲染。 首先考虑使用单颗GPU来完成所有工作。 这里单GPU渲染工作方式有很多种，这里以顺序渲染作为例子。 上图展示的就是一次渲染的单GPU工作流，特点是两个眼睛共享shadow buffer。 然后我们再来考虑同时使用多个GPU来渲染。 AMD, Nvidia提供的多GPU协同工作API大同小异，都具备以下的重要功能： 广播draw call + mask来 确定每个GPU的工作内容 每个GPU拥有独立的shader constant buffers并可以独立设置 在GPU之间传输（或异步传输：在目标GPU在工作时不会打断，特别有用）渲染目标主体 使用两个GPU的情况： 每个GPU渲染一只眼睛看到的东西 每个GPU都需要渲染shadow buffer 次GPU的渲染结果需要提交到主GPU上，最终提交给VR system 实践证明这样的方式大概可以提高30-35%的系统性能 使用4个GPU的情况 每个GPU只需要渲染半只眼睛看到的画面 但是每个GPU还是需要独立的都运算一遍shadow buffers 对于 pixel shader的cost来说每个GPU减到原来的1/4，但是对于vertex shader来说，每个GPU都需要做，cost还是1。（相比较于单GPU） 太多的GPU驱动的工作协调会带来更高的CPU
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Optimizing the Unreal Engine 4 Renderer for VR

By sc1991327 All, VR, VR Rendering

https://developer.oculus.com/blog/introducing-the-oculus-unreal-renderer/   For Farlands, the Oculus team wrote an experimental, fast, single-pass forward renderer for Unreal Engine. It’s also used in Dreamdeck and the Oculus Store version of Showdown. We’re sharing the renderer’s source as a sample to help developers reach higher quality levels and frame rates in their own applications. As of today, you
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