I noticed that if I make a height field like this...

height_field
{
   function nPoints, nPoints {fn_X(x,0,y)}
   smooth
}

as you increase "nPoints" the normals get messed up somehow (visible easily 
if you have specular or reflection enabled) both with and without "smooth". 
Check the attached images, notice how the grid texture becomes better with 
nPoints at 1000, but then the normals get screwed up.  Is it a bug?

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