The non-cgal version just chooses points on the upper hemisphere in 4D with uniform probability (since quaternions are sign-invariant). Not sure what you mean by patches.
On Oct 6, 2010, at 8:26 AM, Keren Lasker wrote:
> thanks Daniel.
> you mean that its uniform on patches of the same area on the sphere
> right?
> in that case it might be ok.
> On Oct 6, 2010, at 5:22 PM, Daniel Russel wrote:
>
>> If you don't have cgal installed, it just takes n random points
>> uniformly over the upper half of the 4 sphere.If you have CGAL, it
>> smooths them out some.
>>
>> I'm not sure what you mean by poles (it is uniform over the upper 4-
>> sphere).
>>
>> On Oct 6, 2010, at 6:43 AM, Keren Lasker wrote:
>>
>>> hi Daniel -
>>>
>>> Frido and I are using get_uniform_cover_rotations_3d for exhaustive
>>> rotational sampling.
>>> The code for this function seems to sample random vectors on a 4D
>>> sphere.
>>> How sensitive is it to poles over sampling?
>>>
>>> thanks,
>>> Keren.
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>>
>>
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