topic Re: how do i rectify buildings so they can float on terrain instead of sinking? in ArcGIS CityEngine Questions

how do i rectify buildings so they can float on terrain instead of sinking?

johne — Tue, 19 Aug 2014 10:58:56 GMT

when i put terrain on my scenes and align my models to it..they are sinking into the terrain and also the texture file is not displaying.

Re: how do i rectify buildings so they can float on terrain instead of sinking?

MatthiasBuehler — Tue, 19 Aug 2014 20:48:25 GMT

hi .. what type of buildings do you have ?

can you post a screenshot of what your workflow is ?

let me know ..

Matt

Re: how do i rectify buildings so they can float on terrain instead of sinking?

johne — Wed, 20 Aug 2014 11:16:02 GMT

after i analyzed the graph and changed the size of the DEM it worked. even so thank you

Re: how do i rectify buildings so they can float on terrain instead of sinking?

RobertJenkins1 — Tue, 13 Jan 2015 16:46:56 GMT

In this same vein, How do I set my building "foundations" to follow the terrain. At the moment I have to set each building foundation's elevations so the building's are level.

Re: how do i rectify buildings so they can float on terrain instead of sinking?

Anonymous User — Sat, 11 Dec 2021 17:28:25 GMT

To get a foundation shape:

1. Run Align Shapes to Terrain command, and choose Project All, so that each vertex is on the terrain.

2. In your rule's start shape, put alignShapeToAxes(y) to make sure the scope (bounding box for the vertices) is aligned with y axis straight up.

3. At this point, the scope.sy attribute of the shape is the height of your foundation.

...

Oh, never mind, I just wrote a rule to demonstrate it:

version "2014.1"


# For use on non-flat building footprint,
# so project footprint to terrain using Align Shapes to Terrain (Project All option).


@Hidden
attr originalScopeY = 0


@StartRule
SlantedBuildingFootprint -->
  # Align scope to have y axis up.
  alignScopeToAxes(y)
  # Save this shape's height.
  set(originalScopeY, scope.sy)
  # Flatten footprint by scaling y to zero.
  s('1,0,'1)
  extrude(originalScopeY)
  color(1,0,0)
  # Make it transparent for demo purpose.
  set(material.opacity, 0.5)
  # At this point the top or bottom can be used for floors (basement and upper floors.

Picture of original slanted footprint, with foundation. This shape represents if you build a foundation shape that reaches the highest and lowest points where your shape hits the terrain. Is this what you are looking for? -Chris

Re: how do i rectify buildings so they can float on terrain instead of sinking?

Anonymous User — Tue, 13 Jan 2015 17:55:17 GMT

This ensures no part of your first floor "sinks" below the ground, but you might choose to lift the top face a bit to get the foundation to show at least a foot or so before starting your ground floor.

Re: how do i rectify buildings so they can float on terrain instead of sinking?

RobertJenkins1 — Tue, 13 Jan 2015 18:04:00 GMT

Thank you!

I'll start working with this momentarily.

Re: how do i rectify buildings so they can float on terrain instead of sinking?

RobertJenkins1 — Tue, 13 Jan 2015 18:06:25 GMT

I'm hoping that when I get some Lidar data I'll have a better terrain model with which to work!