Sorting points

Hi all,

I have a tree with branches full of point pairs resulting from curve-curve intersections - in theory at least there should be exactly two points on each branch. Now, I need to do stuff with the point in each pair that has the lowest Z value (then later the highest Z)... The problem is the intersections are not returned sorted by Z, sometimes the lower point is first in the list, sometimes last. So I need to sort those pairs of points by Z value.

I noticed the sort points component does not have any inputs for sort criteria... RhinoScript SortPoints allows you to sort by:

blnOrder

Optional. Number. The component sort order, where:

Value	Component Sort Order
0 (default)	X, Y, Z
1	X, Z, Y
2	Y, X, Z
3	Y, Z, X
4	Z, X, Y
5	Z, Y, X

Will we get something like this in GH? For now I think I can manage to analyze the Z for each and re-order the points, but a more comprehensive point sorting tool might be nice... no? Or did I miss something obvious? --Thx, --Mitch

Replies to This Discussion

Permalink Reply by Luis Fraguada on March 6, 2010 at 5:53am

You can decompose the pts, use the z value Into the first input of the logic > sort component, put the points into the next input...

Permalink Reply by Mitch Heynick on March 6, 2010 at 7:11am

Hey Luis,

Thanks! I had started out in that direction, but I couldn't make it work at first - tried again and now it's working - I had to sort the list and use a dispatch component to separate the lower and upper values in each branch.

I had thought it would be easier to do... compare the Z coordinates and choose the one which was less - in any case that's how I would script it... there's only two values to compare. But, I tried that, decomposing the points and inputting the Z's into a less than (<) component, and using that T/F list to dispatch the points - but that gave me the wrong points - the < component is not liking my tree structure, I think... I'll have to investigate why... --Mitch

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