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M README.md

@@ 5,6 5,12 @@ Prototype engine to render signed distance fields in Augmented Reality defined b
 
 ![image](http://connorbell.ca/images/conemarcher-readme/conemarching.jpg)
 
+##  Building / Device Support
+
+No dependencies, just build and run!
+
+The device compatibility with Metal Function Pointers is unclear. It runs on my iPad Pro (3rd gen) but not on iPhone 12, so I suspect it's limited to M1 devices.
+
 ##  Engine Architecture
 
 ARSession provides color, smoothed depth, and the view+projection matrices to the conemarcher.