大勢所趨，沒有進步被時代淘汰，更好的渲染器代替了他。

演算法落後了，cpu渲染效率被Arnold完全超越，gpu渲染看來根本就不打算開發，其實自動桌是對的，直接把ar/rs買下來，這不挺好的，這本來就是一個平臺該乾的事情，順勢而為，gpu渲染gpu解算，大勢所趨。

一句話，產品更新換代，舊的被淘汰..
mentel ray定位有點尷尬，做電影短片的話renderman貌似更流行，做遊戲級別的短片，mentel ray用起來又太複雜了...而且mentel ray貌似沒有vpr，沒這個效率差很多...
就看阿諾德未來是否會加入GPU渲染的功能了。否則還是跟不上市場的需求。

Why is Autodesk making these changes?

Earlier this year Autodesk purchased Solid Angle, the company that develops Arnold, with the goal of adding high-quality rendering to our product portfolio. As a result of this acquisition, we have decided to create an open rendering ecosystem for our products where different renderers, including both mental ray and Arnold can compete equally. For this reason, we will no longer be bundling mental ray, or another background renderer, with Maya. There is a lot of innovation happening in rendering at the moment and with more and more choices in terms of speed, price, quality and capability we want to allow customers to choose the renderer that works that best for them.
However, we also believe that Maya should have the ability to produce high-quality renders out-of-the-box. We will therefore include the ability for customers to use Arnold foreground processing within Maya so that you can get started creating amazing content immediately.

官方的解釋：
Changes to rendering in Autodesk Maya 2017

Autodesk應該是不出Mental Ray了，而且已經發布了Mental Ray過渡Arnold手冊，若要載入Mental Ray相關節點，請自行至Mental Ray網站下載使用。
還沒有用上2016 不過我猜是有了arnold新歡了吧。不知道我心愛的arnold什麼時候被玩壞

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