I'm really not the one to answer but could it be because when you switch D
to 2 not only does the sphere get bigger, but the camera moves back to 1500
units. When D is 1 there is 500 units separating them when D is 2 where is
1100 units. Also you could try <0,0,750*D>, I thought there was something
about 3.5 not handling vectors or some such thing, don't ask me:-)

"QQ" <now### [at] nowhereno> wrote in message
news:Xns### [at] 204213191226...
>
> I've encountered a problem with the blob primative where blob components
> above a certain size disappear completely.  The code below demonstrates
the
> problem.  With D=1, the scene renders correctly; with D=2 (blob size ==
> 400), Pov generates a blank image.
>
> #local D = 2;
> blob
> {
>     threshold 0.75
>     sphere {<0,0,0>, 200*D, 1}
>     pigment {rgb 1}
>     sturm  //makes no difference
> }
>
> camera {location <0,0,750>*D look_at 0}
> light_source {<0,0,750>*D color rgb 1}
>
>
>
> HW: Win2K running on a Celeron 400 CPU with 128MB ram.

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