validateRenderPassDescriptor:551: failed assertion `Texture at depthAttachment has usage (0x01) which doesn't specify MTLTextureUsageRenderTarget (0x04)'


XCODE9
Product -> Scheme -> Edit Scheme -> Run -> Options -> GPU Frame Capture -> OpenGL ES
ひとまずこれでテストはできる 


または

Unity Other Setting -> Auto Graphics API チェック外す ->  OpenGLES2