[OpenSCAD] boolean logic in openscad

chrysn chrysn at fsfe.org
Wed Oct 26 19:50:09 CEST 2011

On Wed, Oct 26, 2011 at 01:36:10PM +0000, William Adams wrote:
> I am wanting to implement a function that has the following pattern
> func(x) = (x<<13) & 0x7fffffff[...]?

are you aware that this is just the same as func(x) = (x*8192) % 2147483648;
(that is, in more readable but non-openscad notation, x*(2^13) % 0x80000000)?

(at least, if you expect x to behave like an integer -- i couldn't
correlate your sniplet to the source code i found when quickly looking
it up[1].)


[1] http://mrl.nyu.edu/~perlin/doc/oscar.html#noise

To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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