topic Re: Make polygons follow terrain surface in ArcGIS CityEngine Questions

Make polygons follow terrain surface

F_RContreras — Sun, 18 Dec 2016 18:26:33 GMT

I watched a video about the M Buehler Favela project, and I want to know how he make a group of polygons follow the terrain surface, he use it to trees and vegetation, I know about the align shape to terrain, but it seems like he use a big polygon and then he divide it into a grid that he adapts to the terrain

Thanks

Re: Make polygons follow terrain surface

ThomasFuchs — Sat, 11 Dec 2021 15:33:16 GMT

Hi Felix

I think Matthias Buehler‌ does something like this:

draw some shapes covering the terrain
select the shapes
then run a python script to perform a block subdivision on them

subdsettings = SubdivideShapesSettings()
subdsettings.setLotSubdivisionMethod("RECURSIVE")
subdsettings.setLotAreaMin(100.0)
subdsettings.setLotAreaMax(100.0)
subdsettings.setIrregularity(0)

terrainShapes = ce.subdivideShapes(ce.selection(), subdsettings)

terrain = ce.getObjectsFrom(ce.scene, ce.isMapLayer)[0]

settings = AlignShapesSettings()
settings.setHeightmap(ce.getName(terrain))
settings.setAlignFunction("PROJECT_ALL")

ce.alignShapes(terrainShapes, settings)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Make polygons follow terrain surface

MatthiasBuehler3 — Fri, 30 Dec 2016 10:29:10 GMT

hi guys ..

what I did is I just drew a big rectangular shape over the whole terrain, then wrote a rule that splits x*z* into squares. I then converted the squares model to a shapes, divided it up into separate shapes for each square and projected those square shapes down onto the terrain. I had to repeat this a couple of times until I was happy with the square size.

Re: Make polygons follow terrain surface

F_RContreras — Sat, 31 Dec 2016 22:00:40 GMT

It worked!!, Thanks Matt!!

Re: Make polygons follow terrain surface

MatthiasBuehler3 — Sun, 01 Jan 2017 15:25:01 GMT

yep, that's exactly the way to do it.

cheers!

matt