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"Dre" <and### [at] gmail com> schreef in bericht
news:4bbd517d$1@news.povray.org...
> "Dre" <and### [at] gmail com> wrote in message
> news:4bbd2f59$1@news.povray.org...
>> Hi, as the title states, can you use the trace command on a heightfield?
>>
>> I've been trying and trying and I cant get it to work. I've successfully
>> used the trace() command on isosurfaces and simple boxes, spheres but I
>> cant for the life of me get this to work.
>>
>> Just wondering if this actually does work or I'm barking up the wrong
>> tree!
>>
>> Cheers Dre
>>
> Nevermind, I worked it out, that trace command has some weirdness about
> it.
>
> This doesn't work:
>
> #declare norm = <0, 0, 0>;
> trace(object, <xPos, 10, zPos>, <xPos, -10, zPos>, norm>)
>
> Yet this does:
>
> #declare norm = <0, 0, 0>;
> #declare startPoint =<xPos, 10, zPos>;
> #declare endPoint = <xPos, -10, zPos>;
> trace(object, startPoint, endPoint, norm)
>
> Unless I'm doing something wrong, that seems broken to me...
>
No, trace() is not broken. The following always works for me, with whatever
object as target:
#declare Norm = <0, 0, 0>;
#declare Start = <my.x, 10, my.z>;
#declare Pos = trace (Obj, Start, -y, Norm);
Start must be above the object, so adapt the y value; -y indicates the
direction of tracing.
Thomas
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