Daniel - thanks a lot - this is exactly what is needed. even rotational search is needed for many applications !!! On Jun 2, 2009, at 9:46 AM, Daniel Russel wrote:
> And what does the "search" bit mean? Do you want a cover of rotations? > > If so, a reasonable start is to just to uniformly sample a 4D sphere > (we have code for that). The second step would be to even out the > points a bit. A good way to do that would be to repeatedly, compute > the convex hull of the points and then move each point to the > centroid of its neighbors. CGAL has code to compute the convex hull. > At least for 3D points, such an operation typically ends up with a > nice even cover after a few iterations. I can write the code if you > want as it would be pretty quick. > > On Jun 2, 2009, at 12:09 PM, Keren Lasker wrote: > >> yes - i meant that it would return Rotation3Ds >> >> On Jun 2, 2009, at 5:20 AM, Daniel Russel wrote: >> >>> I don't understand what you are looking for. It sounds like it >>> might be an even sampling of the set of rotations but your >>> prototype below only returns one rotation... >>> >>> >>> On Jun 2, 2009, at 4:10 AM, Keren Lasker wrote: >>> >>>> hi all, >>>> >>>> Has anyone implemented a function that generates a set of grid >>>> search orientations ? >>>> something like: >>>> IMP::algebra::Rotation3D rotation_grid_search(IMP::Float distance); >>>> >>>> We have sphere based and cylinder based rotation sampling, but it >>>> seems that there are better ways (quaternions based) that >>>> maintain a fixed "distance" between all pairs of orientations. >>>> >>>> >>>> thanks, >>>> Keren. >>>> _______________________________________________ >>>> IMP-dev mailing list >>>> IMP-dev@salilab.org >>>> https://salilab.org/mailman/listinfo/imp-dev >>> >>> _______________________________________________ >>> IMP-dev mailing list >>> IMP-dev@salilab.org >>> https://salilab.org/mailman/listinfo/imp-dev >> >> _______________________________________________ >> IMP-dev mailing list >> IMP-dev@salilab.org >> https://salilab.org/mailman/listinfo/imp-dev > > _______________________________________________ > IMP-dev mailing list > IMP-dev@salilab.org > https://salilab.org/mailman/listinfo/imp-dev