topic Re: Random texture in ArcGIS CityEngine Questions

Random texture

ziadfilfili — Tue, 20 Nov 2012 12:23:29 GMT

Hi there,

I need help in applying random texture to my buildings.
All my textures has the same name but different numbering.

Is there a way for a random rule texture where it can be applied for all the buildings with the same height at once ?

cheers,

Re: Random texture

JoanneO_Brien — Sat, 11 Dec 2021 14:56:14 GMT

have you tried something like:

attr height = 10
const buildingtex = fileRandom("assets/buildingtex*")

Lot--> Building(comp.index)
Building(myIndex)--> case height == 10 : Texture1
                              else: Texture2.
Texture1-->setupProjection(0, scope.xy, scope.sx, scope.sy)
  projectUV(0) 
                           texture(buildingtex)

The fileRandom will choose random textures within your path, when they've all got the same name and different numbers you add the name at the start and the * indicates the numbers that will change.

Hope that helps! 🙂

Re: Random texture

ziadfilfili — Mon, 26 Nov 2012 11:01:38 GMT

Many thanks for the assistance.
I tried the code you gave but it didn't work.
So i tried the script found within the image attachment.

I have 16 facade textures in my assets that i want to apply to all the buildings in my scene randomly.

I got something to work out.
But what I really want is to associate ONE Facade texture for the 4 sides of the building and not different facade textures for every side.

How can I generate that?!

Re: Random texture

MatthiasBuehler1 — Mon, 26 Nov 2012 14:06:55 GMT

Hi !

then, you forgot to define the filesearch as a 'const'.

const buildingtex = fileRandom("assets/buildingtex/myFacade*.jpg")

Re: Random texture

BenHaas — Thu, 29 Nov 2012 15:45:35 GMT

Is there any way to randomize color?

Re: Random texture

JoanneO_Brien — Thu, 29 Nov 2012 22:52:11 GMT

If you have specific colours you want you could randomise using the Stochastic Rule where you assign a percentage for each colour, then it can randomly pick between those colours. Alternatively have you looked at the colorRamp operation? I haven't played around much with this myself yet but I might be useful for your query, check it out in the help files anyway.

hope that helps! 🙂

Re: Random texture

floLang — Tue, 08 Jan 2013 08:04:53 GMT

Very interesting ! but lets say, i want to use a random facade rule instead of a texture - how would that be managed ?
greetings

Re: Random texture

JoanneO_Brien — Sat, 11 Dec 2021 14:56:17 GMT

you can also do randomised colour by

color(rand(0,1),rand(0,1),rand(0,1))

Again with the facade rules you could always use a stocastic function where you say

Facade1--> ...
Facade2-->...
Facade3-->...
RandomFacade--> 30% : Facade1
30% : Facade2
else: Facade3

Re: Random texture

boycepostma — Tue, 23 Jul 2013 19:54:00 GMT

Hi !

then, you forgot to define the filesearch as a 'const'.
const buildingtex = fileRandom("assets/buildingtex/myFacade*.jpg")

OH MAN! Thanks for this Matthias (though way old).

I was searching forever to find a way to keep a random texture the same throughout the CGA code. The help contents needs a little ProTip specifying this.

-ap-