Hi Pilou, 
 
> about level color : only artistic reason for something like 
> landscaping, and possibility to address snow, waters, vegetation 
 
Oh, I see what you mean - a color value by height in z? 
 
But no - that is not at all what was shown in there, it was a curvature analysis based on the curvature values of the surface, not having to do with z values. 
 
 
> about "Strength of materials" just if libraries exist and are 
> easily adapted why not put it inside moi 
> (for architectural or engeneering domain :)  
 
As far as I know there is no easily available free library that I could use for structural analysis. It tends to be a complex area that usually has expensive software to handle it. 
 
So the lack of existence of such a library is one problem... 
 
And even if there was such a library, it would still take quite a bit of work to adapt such a thing into MoI. 
 
So that's another reason - if I were to spend time on that I would have to postpone other features because I can't work on many projects all at the same time... 
 
   - Michael 
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