"Chris B" <nom### [at] nomailcom> schreef in bericht 
news:496c823c$1@news.povray.org...
> Am I correct in assuming that the error appears with no other values set 
> and that the following 2 scene files both produce the error on your 
> machine?
>
> camera {location <0,3,-10> look_at 0}
> light_source {<-10,20,-50>, rgb 1}
> #include "blockwall.inc"
> #declare Blockwall_Spline = spline {
>  cubic_spline
>  #local I = -0.25;
>  #while (I<=1.25)
>    I, vrotate(6*z,-y*I*360)
>    #local I = I + 0.01;
>  #end
> }
> Blockwall_FollowSpline("")
>
>
> camera {location <0,3,-10> look_at 0}
> light_source {<-10,20,-50>, rgb 1}
> #include "blockwall.inc"
> #declare Blockwall_Radius = 6;
> Blockwall_Arc(360,"")
>
> (These two should both be functionally identical).
>

Both example work correctly and after several changes to the radius, no 
error message appears. This means that the error is generated elsewhere. I 
copy here the code I use, with a radius leading to an error message. I 
suspect that HBias, VBias or MaxHU, MaxVU are the prime suspects:

// Declare a circular spline
#declare Blockwall_Spline =
spline {
  cubic_spline
  #local I = -0.25;
  #while (I<=1.25)
    I, vrotate(3.3*z, -y*I*360)
    #local I = I + 0.01;
  #end
}

#declare Blockwall_BlockRoundness  = 0.1;
#declare Blockwall_Brightness      = 0.5;
#declare Blockwall_Debug           = 1;

// Set up a very rough stone
#declare Blockwall_MinColor        = <1.00, 0.70, 0.60>;
#declare Blockwall_MaxColor        = <1.00 ,0.90, 0.70>;
#declare Blockwall_Contrast        = 0.4;
#declare Blockwall_ClipBlock       = 1;
#declare Blockwall_MatrixSpacing   = 0.02;
#declare Blockwall_HBias           = 2;//0.3;
#declare Blockwall_VBias           = 2;//3;
#declare Blockwall_MaxHU           = 35;//10;
#declare Blockwall_MaxVU           = 20;//5;
#declare Blockwall_Finish = finish {phong 0 ambient 0}
#declare Blockwall_Normal =
normal {
  average
  normal_map {
    [0.5  granite 1 scale 0.25]
    [0.5  agate   1 scale 0.05]
    [1.0  marble  1 rotate z*90 turbulence 0.5 scale <0.3,0.1,0.5>]
  }
}

// Create a circular wall
#declare Blockwall_Wrap = 1;
#declare Blockwall_WallHeight = 2.5;
#declare Blockwall_Holes =
//union {
  box {<-0.251, 0.099, 2.5> <0.251, 0.751, 3.5>}
  //cylinder {<0, 1.4, -1.41> <0, 1.4, -1>, 0.4}
//}

object {
  Blockwall_FollowSpline("")
  //Blockwall_FollowSpline("BuffBrick")
  //Blockwall_FollowSpline("RoughStone")
}

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