Le 2021-10-17 à 06:40, kurtz le pirate a écrit :
> 
> Hello,
> 
> I have a problem with  atan2(a,b) when b = zero.
> 
> The documentation on the page 
> <http://www.povray.org/documentation/view/3.7.1/228/> says :
> 
> Arc-tangent of (A/B). Returns the angle, measured in radians, whose 
> tangent is (A/B). **Returns appropriate value even if B is zero**
> 
> In my case, i get : Parse Error: Domain error in atan2!
> 
> So it's up to me to test if b=zero and return the appropriate value ?
> 
> 
> 

A/B is undefined when B = 0.
So, «Parse Error: Domain error in atan2» is the appropriate value when B 
is zero.
The appropriate value when B is zero would be plus AND minus infinity.

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