今年6月，小派公司在全球範圍徵求他們公司下一代虛擬現實頭盔的測試者，我有幸被邀請成為國內唯一的一位。小派參考了測試者的意見，最終推出了定型產品M2，分雙4K屏的8K版與雙2K屏的5K＋版。從理論上說，當然是8K版比5K＋版更更好，但是這兩個輸入的都是雙2K信號，8K版在機內插值升頻到雙4K，5K＋版是雙原生2K。那麼問題來了，插值升頻能有效地提升8K版的實際分辨率嗎？還是僅僅讓畫面看上去更細膩？更復雜的是，這兩個型號的透鏡光學系統是完全一樣的，但8K版的液晶屏比5K＋版的要大，邊緣部分有更多像素未被利用，因此5K＋版的實際有效像素有可能比8K版還要多，也就是說清晰度有可能比8K版還要高。當然8K版的像素肯定更小，窗簾效應肯定更小，至少表面看上去會更細膩。小派也一定是意識到了情況的複雜性，竟然允許先前已付款眾籌8K版的用戶可以重新選擇5K＋版。這樣一來，到底是選8K版還是5K＋版，已經成為眾籌者最頭痛最熱門的難題，他們迫切希望在做出選擇之前先聽聽測試者的意見。現在，8K版與5K＋版都已經來到了我的面前......
首先聲明一下，這不是廣告。小派8K和5K目前還沒有國內銷售的計劃，在國外也只能提供給已經付款的眾籌用戶。我做這個測試，純粹是出於對VR的熱愛。請隨意體驗一下我擁有的部分VR器材：
當然也未嘗沒有一點自豪，作為國內唯一一位擁有目前最先進的次世代VR設備用戶的自豪感。是的，連王思聰也沒有。
那麼我一箇中文系老師，為什麼對VR這個高科技產品這麼感興趣呢？長話短說，我認為VR關係到人類文化的未來，包括文學的未來。有興趣的可以看看我的這個講座介紹：
但是VR的發展目前進入到一個停滯期，所以不少人開始唱衰VR。VR確實遇到了一些瓶頸，其中最主要的一個就是視野太窄，分辨率太低，下一代產品遙遙無期。小派8K在這種沉悶氣氛下橫空出世，規格驚人，打破僵局，令大家非常期待。
言歸正傳，下面請看我的評測，評測的內容是......英文的，因為主要是供國外的眾籌用戶參考，不過我的評測主要是用手持手機在頭顯透鏡後實拍說話，所以其實光看圖也能明白。我也會做一些簡短的翻譯。原文地址：
https://forum.pimaxvr.com/t/5k-or-8k-my-test-of-m2-through-pictures-of-aerofly-fs2-project-cars-and-virtual-desktop/8249
Hi VR Enthusiasts,
I am one of the luck testers, happy and eager to share my test result of M2 with you. I won't cover all aspects of M2 as I think SweViver and other testers will do more comprehensive and deeper reviews. I will focus on something I care most: resolution. I mainly play flight simulation in VR, so resolution has been my utmost concern (and complaint) with current VR headsets. I have watched the video of the last Berlin meeting, and I am aware that there are quite some people playing sims as me, and they are uncertain how to choose from 8K and 5K+. I will tried to answer the question with this report. As impressions can be very subjective, I will use the pictures I took through the lens for comparison. And I will give the parameters of these tests as much as possible so that you can reproduce the results at home for comparison with your own headsets.
I have done my comparison tests of 8K and 5K+ through three application: Aerofly FS 2, Project Cars, Virtual Desktop. I use Huawei P20 pro for taking pictures. P20 pro has Leica lens, manual focus, and 3X optical zoom. It's a handy tool for the job, yet the pics are not true reproduction. The pics have some noises, warps, and colorization that are not present when seeing directly through the lens. You just need to look for the most clear part of the pics for more exact reference. For each scene I took 1X and 3X zoom (Project Cars 1X and 2X). The pictures attached are all unmodified. You can click to watch in its original size.
My PiTool is 0.74C, parallel projections mode enabled, FOV normal, rendering quality 1.75. SteamVR Supersampling for 5K+ is set to 40%, rendering at 3278x2914. 8K SS is set to 42%, rendering at 3164x2899. I don't understand why 8K renders at lower resolution than 5K+. Is it proof that 5K+ is using more effective pixels than 8K? Anyway, at the above SteamVR SS they both have almost equal framerate on Aerofly FS 2.
My computer platform: Intel [email protected], 32gb, Nvidia GTX 1080
這一段說的是我主要通過三款應用來進行對比評測，每一張圖都是未裁剪的原圖，並且給出了詳細的拍攝參數、圖像設置、場景名稱，其他用戶可以很容易在自己的設備上還原同一場景。
1. Aerofly FS 2.
Graphic setting: 1920x1080, all maxed out.
Scenery: Orbx Netherland TrueEarth, Amsterdam Intl, runway 06.
Airplane: Cessna 172, default startup state. Both headsets are of equal distance to the instruments.
Framerate: 8K: 36, 5K+: 37
Picture comparison8K 1x
![下一代的VR已經來到身邊——小派8K與5K+圖片對比評測]()
5K+ 1x
8K 3x
![下一代的VR已經來到身邊——小派8K與5K+圖片對比評測]()
5K+ 3x
2. Project Cars
Graphic setting: 1920x1080, all maxed out, all special effect such as sun flare, bloom, haze, etc. turned off.
Track: Hockenheim Classic Germany, solo quick race. I set number of opponents to 0 so that the car always starts at the same position.
Vehicle: RWD P30 LMP1, default standby mode.
Framerate: PC does not have in-game framerate counter, nor can I get Steam framerate counter to show in this game. On both headsets the framerates of PR are fairly smooth.
Picture comparison
8K 1x
5K+ 1x
![下一代的VR已經來到身邊——小派8K與5K+圖片對比評測]()
8K 2x
5K+ 2x
![下一代的VR已經來到身邊——小派8K與5K+圖片對比評測]()
3. Virtual Desktop
Graphics setting: 1920x1080, Virtual Desktop built-in supersampling 3.0, screen size 130 degree, screen distance 7.0, no curve, purple nebular environment.
Sample text: Times New Roman, size 10, Windows Wordpad.
Refresh rate: 8K: 80, 5K+: 91. The fresh rate of 5K+ is a bit strange, but I don't think it's a big deal.
Picture comparison:
8K 1x
5K 1x
![下一代的VR已經來到身邊——小派8K與5K+圖片對比評測]()
8K 3x
5K 3x
![下一代的VR已經來到身邊——小派8K與5K+圖片對比評測]()
4. Subjective observation
I let out a "Wow" when I opened Virtual Desktop on 5K+. This is the first time I saw clear texts of a complete Windows desktop on any headset, period. This is a moment to remember, and a milestone in VR history. Pimax can't be praised enough for this achievement alone. I suggest anyone who has a 5K+ should try Virtual Desktop first. I wish you could share my joy. At the Berlin meeting Pimax CEO Robin claimed 5K+ has 9% more effective pixel than 8K, but I feel it's more than 9%. Just look at the pics.
It's easy to notice from the other two tests. Look at the letter "E" on the heading indicator of FS2, and the word "Vittorius" on the roadside of Project Cars.
Yet the clarity of 5K+ does not come at no price. You can immediately notice from all the pics that the pixels are bigger and more noticeable on 5K+. How noticeable? There is a small airplane symbol in the center of the heading indicator of FS2. You can clearly count 7 lines of pixels for the wing of the airplane symbol on 5K+, but it's hard to count them on 8K, whose screen looks smoother and more refined.
這一段是主觀印象，與圖片是一致的，就是5K+比8K更清晰，因為5K充分利用了更多的液晶面板，而8K有一部分像素是在視場之外，白白浪費了。另外5K用的是雙原生2K信號，而8K是雙2K信號通過機內插值升頻到4K，這樣圖像是更細膩了，但真實分辨率並沒有上去，甚至可能造成了某些虛化效果。
Conclusion
Now we come to the answer to the golden question: 8K or 5K+, which one should we choose? I can't see much difference of FOV between to two. Under the same rendering and supersampling parameter they have almost the same framerate. So effective resolution and pixel size remain the two most cruxial factor. If you are more into simulation games as me, I'd suggest 5K+, as every pixel counts in these games. If you are more into action, adventure, RPG, sports games, etc., which relies more on overall aesthetics, I'd suggest 8K. Or I can put it in another way: if you care more about details and realism, go for 5K+; if you care more about art and beauty, go for 8K.
And finally I must thank Pimax for bringing us a long waited advance in VR!
結論：8K，還是5K+，怎麼選呢？我推薦像開飛機和賽車之類的模擬遊戲玩家選擇5K+，因為這類遊戲需要看清儀表和艙外的標誌、目標，對真實分辨率要求更高。而RPG、動作、射擊、冒險、體育等類遊戲的玩家就可以考慮8K，因為這些遊戲更講究畫面的優美細膩。那麼看電影如何選擇呢？其實電影中也是非真實系和唯美系，如果是看歐美電影，5K+更合適，如果是看日式動漫，那當然是8K啦。
要真，還是要美？這其實是人類永恆的選擇困難。王國維先生感嘆世上的事情，“可愛者不可信，可信者不可愛”。越來越覺得他老人家這個糾結的句式可以推到其他問題上，比如食物：好吃的不健康，健康的不好吃，奈何！
所以VR也是這樣，沒有一個設備是能窮盡世上所有用戶的需求的，但我們需要小派這樣的新興公司，銳意進取，勇於冒險，不想某些擠牙膏的大廠，非把儘可能多的用戶榨乾才慢吞吞地出下一代，等得花兒都謝了。
謝謝小派！
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