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I have been scratching my head on this, but found a solution thanks to this gist. It contains a dump of the Metal interface containing the inputs provided by SceneKit. No more guessing!I am absolutely stumped that this is not mentioned anywhere in Apple's documentation.Example fragment shader:#include <metal_stdlib>
// using namespace metal;
#pragma body
_output.color.b = sin(scn_frame.time);
// OR
_output.color.b = scn_frame.sinTime;