Re: [ATM] PlOp PlOp Fizz Fizz What does PlOp think?

["Nils Olof Carlin" <nilsolof.carlin@telia.com>]

Mark,



>I think unequal loads on triangles is likely to lead to construction
> tolerance problems.  Why?  Because an error in the location of the pivot
> makes a larger proportional error in load when the lever ratio is higher.
> Also, when Plop optimizes a nine point cell, the triangles always come
> out more squat that equal area triangles.  This means that an error in
> pivot location has a greater proportional effect because the lever arm
> is shorter.

In principle you are right indeed, but in my particular example, the effect 
is small - though the inner tip is less loaded, it is nearer the center 
making the triangle less squat, and the distance outer base to pivot point 
is 0.078 vs 0.130 relative radii. Not too unmanageable, I think, but if you 
are careful, you might see what happens if you introduce some error (I 
haven't).

> If you want to see something interesting, turn off equal angles on that
> nine point cell, with refocus on.  You will have to let Plop iterate for
> a while.  Do it with the support point location graph, and/or the color
> deformation plot showing.  I think that mirror is big enough to show the
> effect.  If it does, you will immediately recognize it.  I'll let you
> try it.  If it doesn't do it for you, then I will describe it.

This is indeed worth watching! I think I have mentioned this neat trick to 
lists (can't recall what lists...) but sometimes, you might need to do some 
gentle nudging. And don't turn refocusing off.

best,

Nils Olof 

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