topic Re: Building texture in ArcGIS CityEngine Questions

Building texture

Thu_GiangDang — Tue, 30 Oct 2012 07:45:14 GMT

Hi,

I am trying to add random texture to the my buildings by using the code provided in the tutorial with minor changes. When I assign the rule to the building polygons and generate, the result was mixed: some buildings has texture applied to them, while other remain blank (white). In some case, only one or two sides of the building have texture, but the rest is blank. Please view screenshot as below:

And here's my rule file code:

const randomFacadeTexture = fileRandom("data/facade_textures/f*.tif") attr floorheight = rand(4,5)  actualFloorHeight =   case scope.sy >= floorheight : scope.sy/rint(scope.sy/floorheight)  else : scope.sy   actualTileWidth =   case scope.sx >= 2 : scope.sx/rint(scope.sx/4)  else : scope.sx  Lot -->  extrude(HEIGHT)  comp(f){front: Facade | side: Facade | top: Roof }  Building.  Facade -->  setupProjection(0, scope.xy, 8*actualTileWidth, 8* actualFloorHeight)  texture(randomFacadeTexture)  projectUV(0)

My building layer has 9000+ polygon. I wonder if that is a problem if the number of polygon/faces is too large.

Thank you for your time!

Re: Building texture

MatthiasBuehler1 — Tue, 30 Oct 2012 10:53:35 GMT

Hi !

In the Lot rule, you have a copy of the shape defined with 'Building'.

Try deleting this line and check how this works out.

Let me know..

M.

Re: Building texture

Thu_GiangDang — Wed, 31 Oct 2012 03:24:26 GMT

Thank you!! It works like magic! What is the reason behind this?

Re: Building texture

MatthiasBuehler1 — Sun, 12 Dec 2021 01:14:39 GMT

Haha, no magic at all.

Lot -->
    A.

copies the shape of Lot to A.

Lot -->
    B.

copies to B, logically.

If you write

Lot -->
    A.
    B.

the shape coming from Lot is copied to A. and duplicated to B. So there's 2 copies of on top of each other.

test this with

Lot -->
    alignScopeToAxes(y)
    A.
    t(0,10,0)
    B.

Please watch all Tutorial videos, find them here:
http://forums.arcgis.com/threads/64843-CityEngine-Collection-RESOURCES-FAQ-HELP

Especially, the CGA basics are explained, see tuto 6.

Matt