Alain wrote:
> The orientation of the tests can be passed as a parameter,somewhat like 
> the direction vector used by trace, or a global variable.
> In the later case, you can have a default orientation that is used if 
> the user don't set it.
> 
> That way, if the object been tested have a special shape, the direction 
> can be chosen to be more effecient. After all, not all hightfields are 
> used horizontaly.
> 
> 
> Alain

Updated macro with your suggestion implemented uploaded to p.t.scene-files
It will accept any of the three primary axes, and will default to y if 
the passed parameter isn't at least mostly along one of the axes.

I haven't done a study on very complex surfaces, so I can't say for sure 
how accurate it will be vs. iterations for a fractal-based form or even 
a spikey image heightfield, but I assume that any protrusions small 
enough to be missed by the tracing will not affect the center location 
too much, especially as the grid resolution is increased.

Chris

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