I use something like this:
.
.
.
#declare null=union{}
object {null}
.
.
.
sphere{0,0}

As long as there is one "real" object anywhere in the main
scene, it should work.



"Greg M. Johnson" wrote:
> 
> I'm trying to set up some "modular" code in INC's where I want to have
> the option of having "null objects."  (The application is a body where I
> don't have to say define all the finger objects all the time;  I want to
> have say one object that is all the approprate cylinders, another which
> is just a few boxes.  One INC will define the motion, with modular INC's
> for various "bodies".).
> 
> What is the best way for me to do this?
> 
> Ideally, I could say:
> #declare fingerobject123= object{null}
> 
> If I cannot, what is the next best "null object" to use, especially if I
> don't want it to mess with the bounding box or trace functions or other
> properties of the collection of the objects?  Would it be along the
> lines of
> 
> #declare fingerobject123= sphere {0,1e-10 pigment rgbft 1} ?

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