It came to my attention that one very common implementation of SMI was incorrect; rather than subtracting the first hour delta and adding the last hour delta it subtracts the whole day delta and adds the last 30m delta. While this indicator might have had some use, it is not what I understand to be the actual Smart Money Index and so I post this as a correction for use in other scripts.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in publications is governed by House rules. You can favorite it to use it on a chart.
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