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This question is related to my previous thread at: https://forums.developer.apple.com/thread/62727I was looking for ways update SCNGeometry's source and elements fast, but it seems there is no easy way to this. To get around this, I am looking into using Metal API for rendering tracing path. With SCNSceneRendererDelegate method, I was able to access most of the things needed for rendering, except CAMetalDrawable. Every resources I could find required CAMetalDrawable to render which is nowhere to find.Could anyone direct me where to look regarding this?A sample project that renders with Metal API in SceneKit context would vastly help. Thanks.