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"Doctor John" <joh### [at] home com> wrote in message
news:4a37d69c@news.povray.org...
> I'm having a problem with getting trace to accurately place objects on
> an isosurface.
> ... snip ...
> #declare Terrain_Obj = isosurface {
> function { y-FPigment(x, 0, -z).gray*0.4 }
> ... snip ...
> object {
> Terrain_Obj
> texture { Sand scale 1.4}
> scale <3, 3.1, 1>
> translate <0, -0.65, 0>
> rotate y*45
> }
> ... snip ...
> #declare Pos = trace (Terrain_Obj, Start, -y, Norm );
> #if (vlength(Norm) != 0)
> object {
> Grain
> texture {Sand}
> translate Pos
> }
> Any ideas?
You're placing the object into the scene then scaling, translating and
rotating it.
You then use the non-scaled, non-translated and non-rotated object in the
trace command and position spheres on that.
You should move the transformations out from where you add the object to the
scene and into the object declaration, then it should be ok (though I
didn't run your code to check).
Regards,
Chris B.
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