watchOS 3 支持 SCNLightingModelPhysicallyBased

Question

SCNLightingModelPhysicallyBased是与iOS10一起引入的新光照模型。使用时，不必在SceneKit场景中放置灯光，可以使用环境光照代替。你可以试试这个 open source project.

它在我的 iPhone 6 plus 运行ning iOS 10 上运行良好。但是，它在我的 watchOS 3 Apple Watch 上不起作用。我相信这是因为手表 运行 是 OpenGL 渲染 API 而不是 Metal 渲染 API。

似乎无法强制手表在 WKInterfaceSCNScene 上使用金属渲染 API。

documentation for SCNLightingModelPhysicallyBased 表示 watchOS 3 支持它。

怎样才能让手表达到运行金属渲染？

Answer 1

来自 Existing Frameworks Now Available in watchOS 下的 watchOS 发行说明：

SceneKit in watchOS supports most of the features you use on other platforms, including lighting and shading, animation, physics, and particle systems, with the following exceptions:

• 3D spatial audio implemented using SCNAudioSource or SCNAudioPlayer. Instead, use playAudioSource:waitForCompletion: or the WatchKit sound or haptic APIs.
• Custom Metal or OpenGL shader programs implemented using SCNProgram or SCNTechnique. Instead, customize SceneKit rendering with shader modifiers (to learn more, see SCNShadable).
• Core Image filters for node rendering implemented using the SCNNode filters property. Instead, customize rendering with shader modifiers (see SCNShadable).
• The physically-based material and lighting and HDR camera effects introduced in iOS 10, tvOS 10, and OS X v10.12.