PM 2Ring wrote:
> "Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> wrote:
> 
>>I've been working with a tutorial on the trace() function in conjunction
>>with a random placement macro.  I'm getting some great results, but I was
>>wondering: Is there any way to make my macro take into account the objects
>>it's already placed on the surface, such that there would not be any
>>overlaps?  I'd like to be able to  have the objects pile up as more of them
>>are generated.
>>
>>Regards,
>>
>>A.D.B.
> 
> 
> Do you know you can add to a union? Here's an example from one of my Penrose
> triangle scenes.
> 
> //---------------------------------------------------
> 
> #debug "\nIgnore following warning, this union intentionally empty\n"
> #declare Null = union{}
> #debug "Ignore previous warning, this union intentionally empty\n"
> 
> #declare SetT = Null;
> 
> #macro AddTri(A,B,C) #declare SetT = union{object{SetT} Tri(A,B,C)} #end
> 
> //---------------------------------------------------
> 
> Also take a look at these POV standard scenes:
>  advanced/gaussianblob.pov by Greg M. Johnson (& Rico Reusser).
> 
> and
> 
>  advanced/blocks/makestacks by Gilles Tran, derived from work by John Van
> Sickle and Christoph Hormann, although this one has bits I don't quite
> follow myself as yet... :)
> 
> I hope this helps.
> 
>
Thanx.

	After a little thought, I was able to implement a stacking function 
based largely off the code snip you posted. I am, however, still getting 
some overlap.  I think it's going to have to be a combination of the two 
methods suggested.
	I need to figure out a way to trick the macro into thinking that the 
object's bounds extend a minimum distance (Laterally) from the actual 
object.  Can this be done by setting the bounding box manually?  If so, 
how is this accomplished?

I've posted a test render in P.B.I.

Regards,

A.D.B.

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