I need to create a floor from an existing grid, how can I get curveloop from grid
Hey,
I think you’re going to have to do a lot of work to isolate those lines which are in rectangles, and to order them correctly so they make a loop.
You can sort and group the lines by their Direction, and their setout from 0,0.
Their is a great node in Ampersand called Geometry.SplitByTools which will recursively split your lines.
You can check whether a split line end point has an intersect, if not, filter out the line, because is not part of a rectangle (it’s one of those end pieces).
Then you have to logically group the lines into 4s… There is a node in springs called ‘subpairs’ which will help.
Here’s a start for you, hope it helps,
Mark
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@vanquyet9494 @Mark.Ackerley
It worked well, but my line-sorting is a mess…
RasterGridFloorCreation.dyn (105.1 KB)
Hope there is a easier way, i tried nearest point, sort by key, sort by function, vector.direction, nothing worked realy 
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hello, here is a script (the algorithm is bound to be improved, I’m a beginner)
I don’t know if it’s an imposed constraint that the slab edges are offset (in this case, offset on the polycurve, then recreation of the polycurve 2 nodes to add)
The mesh must necessarily be rectangular.
good day
Cordially
christian.stan
Murs et dalles automatisés sur quadrillage_V2.dyn (190.9 KB)
edit:
It seems that adding the 2 extra nodes is more difficult than mentioned above
You have to take the 2nd possibility of floorByOutlineTypeandLevel and switch to long lacing
I attach the corresponding script
with a creation by rectangles rather than the previous script (by generated surfaces) I don’t know which one is more greedy in calculation time
Murs et dalles automatisés sur quadrillage_V3_modif.dyn (291.5 KB)
good day
Cordially
christian.stan