Am 16.02.2019 um 16:17 schrieb William F Pokorny:

> I've attached an attractors.zip file to a comment to the github issue:
> 
> https://github.com/POV-Ray/povray/issues/239

Thanks - yes, that seems to be the right stuff for testing this.

To reduce parsing and rendering time, I'm testing a slightly modified 
version with 100 instead of 1000 iterations, i.e.:

clifford (1.6,1.9, 0.5,-1.4, -0.4,-0.1, -1.6,1.8, 100, 0.0005, 0.00375, 
cliff_mat, cliff_trans)


On my Windows machine and the x64 Debug version (which should be a bit 
more memory-hungry than the others), I've just compared commit accc779d 
(which did away with the `FixedSimpleVector`, back in 2017-11-10) with 
the commit immediately before, with the following results:

- Before: Required a POV_THREAD_STACK_SIZE of 2 MiB.
- After: Requires a lousy 16 kiB.

I also ran the last test with 1000 iterations just for giggles, with the 
same result: 16 kiB was still sufficient.


I also see no trouble with the Sturmian root solver at 16 kiB (tested 
with `objects/torus1.pov` sample scene, with `sturm` added to torus 
definitions).


So, bottom line: Judging from this first test, even OS X's 512 kiB 
should be enough for everybody now ;)

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