Hi Jimmy, Clamp your input values to the range -1..1 before calling arccos.
Probably just some small numerical error creeping in and pushing it slightly outside that range. -- Brent From: [email protected] [mailto:[email protected]] On Behalf Of jimmy gass Sent: 21 March 2013 7:51 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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