I think POV tells this when it actually hits the heightfield,
but the ray passes right between two triangles. POV-Ray
knows it should have hit something (it should hit the heightfield)
but cannot get a "legal value".
But I'm not too sure. One of the POV-Team will revelate you
sometime these next days, probably...

Zeger Knaepen wrote:

> "Zeger Knaepen" <zeg### [at] studentkuleuvenacbe> schreef in bericht
> news:3ceb10d0@news.povray.org...
> > While tracing my Star Destroyer model, I get this warning or error message or
> > whatever it is:
> > Illegal grid value in dda_traversal().
> > But it doesn't seem to affect the image or the tracing-process.
> > What does it mean?
> Oh, I forgot to mention that my model contains LOTS of height_fields used in
> CSG...
>
> cu!
> --
> camera{location-z*3}#macro G(b,e)b+(e-b)*(C/50)#end#macro L(b,e,k,l)#local C=0
> ;#while(C<50)sphere{G(b,e),.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1
> ;#end#end L(y-x,y,x,x+y)L(y,-x-y,x+y,y)L(-x-y,-y,y,y+z)L(-y,y,y+z,x+y)L(0,x+y,
> <.5,1,.5>,x)L(0,x-y,<.5,1,.5>,x)               // ZK http://www.povplace.be.tf

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde

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