Cosine is always between -1 and 1 inclusive, so arccos (which is its inverse) is undefined outside that range. Just clamp your inputs, and you should be fine.
gray From: [email protected] [mailto:[email protected]] On Behalf Of jimmy gass Sent: Thursday, March 21, 2013 03:51 PM To: [email protected] Subject: arcCos nan I'm having issues with arccos returning nan for some values. Is there a way to filter out the nan and just return 0? It can break renders and simulations. What would cause arccos to return nan, is it like divide by zero? Maybe I can do a check of the values before I'm operating on them. Thanks jimmy
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