POV-Ray: Newsgroups: povray.advanced-users: function accuracy?: function accuracy?

POV-Ray : Newsgroups : povray.advanced-users : function accuracy? : function accuracy?		Server Time 28 Jul 2024 14:34:45 EDT (-0400)

From: Jim Charter
Date: 13 Mar 2005 20:37:53
Message: <4234eaf1$1@news.povray.org>

If I run this sdl:


#debug "\nStart of Process\n"

#debug #concat ("\n atan2= ", str( degrees(atan2(5,16)),2,6), "\n")

#declare Pos =
vrotate ( <0,0,16>, <-degrees(atan2(5,16)), 0, 0> );

#debug #concat ("\n y= ", str( Pos.y,2,6), "\n")

#debug #concat ("\n z= ", str( Pos.z,2,6), "\n")

#debug "\nEnd of Process\n"


I get this result:


Start of Process

  atan2= 17.354025

  y= 4.772400

  z= 15.271680

End of Process

On the face of it I looks like either vrotate or atan2 is only accurate 
to within 5% ?

I would have expected more accuracy.  Are my expectations wrong?  Is my 
thinking wrong?  Am I invoking the functions wrong?  Using debug wrong? 
  This is running MegaPov 1.0 on XP and Athlon 64

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