Beta 16

Machines
Win NT on 450mh w/ aprox 400 MB of memory
Win 98 on Pentium MMX 233 w/ 48 MB of memory

Tried to create a function based height field with the sin function, and
a "plane" appeared on one side of the object in the ZY plane.  It does
not appear when I use sin(x*pi) instead of sin(y*pi).  (It first
appeared when I tried min(sin(x*pi),sin(y*pi)) which gives an
interesting hill.)

Code:

#version 3.5;
global_settings { assumed_gamma 1.0} // to make the objects brighter

camera { location<0,3.5,-4> look_at 0}
plane{y,-1 pigment { rgb z+y } }
light_source { y*100 1 }

// ----------------------------------------

#declare hill =
  height_field
  {  function 20,20 { sin(y*pi) } 
     pigment{ checker scale .2 }
  }
// various angles to see the problem
object{ hill rotate<0,45,0> translate<1.5,0,2>  }     
object{ hill rotate<0,-45,0> translate<-1.5,0,2>  }     
object{ hill rotate<0,135,0> translate<-1,0,0>  }     
object{ hill rotate<0,-135,0> translate<2,0,-1>  }     
object{ hill rotate<0,90,0> translate<0,0,1>}

Thank you.

-- 
Tom A.

into that pit of cotton-top hell, and let them hippity-hop
all over my vulnerable flesh? - Buffy the Vampire Slayer
Deja mail is gone.  Look for me at raugost at yahoo . com

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Confirmed.

The resolution does not matter. 
Try cos (y*pi), too. Does not look correct to me.

Marc-Hendrik
PII 450, 128 MB, Win 98, Pov 3.5 beta 16 (icl)

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