On 08/31/2010 06:24 PM, Sven Geier wrote:
> That's not much of a documentation, I'd like to note. I had never heard of this
> function, but from the documentation I concluded that it should be possible to
> do something like this with it:
> 
> #declare letters = object { text { ttf "arialuni.ttf"  "OPQ", 1, 0} };
> isosurface {
>   function { 0.5-inside( letters ,<x,y,z> ) }
>   contained_by {sphere {0 2}}
>   max_gradient 5
>   pigment {color rgb .5}
> }

so you want to subtract either 0 or 1 from 0.5 .... that's what inside
is going to give you.

> Instead, this gives me the laconic error message
> 
> "C:\Documents and Settings\Sven\test.pov" line 17: Parse Error: Expected
> 'operand', object identifier found instead

maybe this applies:
inside does not accept object-identifiers to non-solid objects.

> So apparently "inside()" doesn't actually accept an object reference
> as an argument, but requires an "operand" (whatever that may mean in this
> context).

This works OK fine for me:

#declare TestObject = box { 0, 1 pigment { rgb 1 } };

#if ( inside ( TestBox, <0.5,0.5,0.5> ) )
	#debug "Inside\n"
#else
	#debug "Outside\n"
#end

change the vector to something outside the test object and the "Outside"
message is issued.

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