On 23-6-2017 12:09, Stephen wrote:
> On 6/23/2017 7:37 AM, Thomas de Groot wrote:
>> To tell the truth, I was not criticising your crackle which is fine by
>> itself and useful in other contexts (a mortared wall?) I wanted to draw
>> attention (mine included) to the very different geometry presented by
>> stacking stones. Obvious, and yet something to ponder deeply for
>> modelling purposes. :-)
> 
> I've spent two days making rocks and trying to lay them in a single 
> layer. I'm really struggling with it.
> 

Yes it is a very difficult task, especially considering how easily 
Mother Nature does it herself. ;-)

Steering clear from specialised modelling packages which can do this, 
and trying to restrict myself to only POV-Ray, trace() is an obvious 
tool but it needs to be completed with some kind of gravity (vertical; 
trace -y) and/or stream energy (horizontal; trace +/-x or +/-z) control 
to settle individual grains before, during, and after impacts over a 
number of incrementing iterations. Not easy!

-- 
Thomas

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