In Arch Linux the same command works. Only had to install mono:

# pacman -S mono
$ mcs -pkg:dotnet /reference:System.Drawing.dll *.cs

How can I run this on a PC?

@ultrasam I lazied out and created a new C# project in Xamarin Studio (which is pretty much like Visual Studio) and added the C# files which where in the repo. Had to add references to System.Xml and System.Drawing before building.

When creating a new C# project in Visual Studio it gives me several options:
Windows Forms Application,
WPF Application
Console Application
Shared Project
Class Library

Which one should I pick??

Use a Console Application and remove the Program1.cs file

I've got all this errors when I tried to build this, I am new at doing a project in Visual Studio 2015, sorry about that, but any help would be appreciated

Right click References > Add, select System.Draw

Ok, perfect that worked it compiled with no errors, now how do I use the program??

Ok, I think I had two programs with the method main and that was causing problems, but now I fixed that and now I am getting the error shown here:

By the way the file samples.xml is there...

After following @squarism 's directions I am getting

System.TypeInitializationException: The type initializer for 'System.Drawing.GDIPlus' threw an exception. ---> System.DllNotFoundException: libgdiplus.dylib
  at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup (ulong&,System.Drawing.GdiplusStartupInput&,System.Drawing.GdiplusStartupOutput&)
  at System.Drawing.GDIPlus..cctor () [0x000cc] in <93576e487af246b9880ff86779ad60ff>:0
   --- End of inner exception stack trace ---
  at System.Drawing.Bitmap..ctor (System.String filename, System.Boolean useIcm) [0x0002b] in <93576e487af246b9880ff86779ad60ff>:0
  at System.Drawing.Bitmap..ctor (System.String filename) [0x00000] in <93576e487af246b9880ff86779ad60ff>:0
  at (wrapper remoting-invoke-with-check) System.Drawing.Bitmap:.ctor (string)
  at OverlappingModel..ctor (System.String name, System.Int32 N, System.Int32 width, System.Int32 height, System.Boolean periodicInput, System.Boolean periodicOutput, System.Int32 symmetry, System.Int32 foundation) [0x00041] in <e8e8a4739e4b4f79b85af1dc0961b451>:0
  at Program.Main () [0x000c9] in <e8e8a4739e4b4f79b85af1dc0961b451>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'System.Drawing.GDIPlus' threw an exception. ---> System.DllNotFoundException: libgdiplus.dylib
  at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup (ulong&,System.Drawing.GdiplusStartupInput&,System.Drawing.GdiplusStartupOutput&)
  at System.Drawing.GDIPlus..cctor () [0x000cc] in <93576e487af246b9880ff86779ad60ff>:0
   --- End of inner exception stack trace ---
  at System.Drawing.Bitmap..ctor (System.String filename, System.Boolean useIcm) [0x0002b] in <93576e487af246b9880ff86779ad60ff>:0
  at System.Drawing.Bitmap..ctor (System.String filename) [0x00000] in <93576e487af246b9880ff86779ad60ff>:0
  at (wrapper remoting-invoke-with-check) System.Drawing.Bitmap:.ctor (string)
  at OverlappingModel..ctor (System.String name, System.Int32 N, System.Int32 width, System.Int32 height, System.Boolean periodicInput, System.Boolean periodicOutput, System.Int32 symmetry, System.Int32 foundation) [0x00041] in <e8e8a4739e4b4f79b85af1dc0961b451>:0
  at Program.Main () [0x000c9] in <e8e8a4739e4b4f79b85af1dc0961b451>:0```

After googling I don't see a simple answer to that. Any one here encountered/solved it?

EDIT:

I was able to get it to do a bit more by following these commands in addition to what @squarism posted. Not sure if this is the best way, but it seems to be working.

1. brew cask install mono-mdk
2. open /usr/local/Caskroom/mono-mdk/4.6.1.3/MonoFramework-MDK-4.6.1.3.macos10.xamarin.universal.pkg
3. env PATH=/Library/Frameworks/Mono.framework/Commands/:$PATH mcs -pkg:dotnet /reference:System.Drawing.dll *.cs
4. env PATH=/Library/Frameworks/Mono.framework/Commands/:$PATH mono Main.exe

@ultrasam is the samples.xml files actually copied to the build directory ? If it isn't you could try copy pasting it there manually to confirm it fixes the issue you're having. I can't remember what was the setting to include a resource file in the build system of VS though...

EDIT: you will probably have the same issue with all the images

well the file is there and I included it in the project:

Here is my project's folder:

Do you see anything wrong there?

Ok I put the samples folder and samples.xml inside the bin/Debug/ folder and it worked!!!, it started creating a bunch of BMPs, now if I want to use my own designs, should I put them on the samples folder??

yes, and reference them in the samples.xml file and fiddle with the properties a bit

Is there a pre-compiled version of this? I am very new to C#, and have no idea how to compile or run it. >.>

Here: https://dl.dropboxusercontent.com/u/24996373/TileCreation.rar

I hope this helps somebody

Thanks, that's perfect. ^^

If you make any new bitmaps or any interesting tileset could you share it, I want to learn

Windows Installation Instructions:

1. Download NuGet: https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
2. CMD > nuget install Microsoft.Net.Compilers -Version 1.3.2
3. CMD > \Microsoft.Net.Compilers.1.3.2\tools\csc.exe *.cs

In my example I had WaveFunctionCollapse-master as my working directory.

Thank you all for helping me to understand how to set this up!
I am a total amateur, so am playing with this as one.
The first thing I tried to do was modify one of the sample images, "flowers", I changed the colours of the petals, and added some other hues of green in the stems.
But this results in many "CONTRADICTION"s, it would be really good to have an idea why this is happening, is it because there is no direct chain of same colour pixels, but then, how do the flower heads work?
Is there a reference to what parameters are available, or what the parameters demonstrated in samples.xml mean? eg, what does foundation="102" mean?

In Fedora 24 this worked for me (besides mono, mono-data-oracle was needed):

sudo dnf install mono-devel mono-data-oracle
mcs -pkg:dotnet /reference:System.Drawing.dll *.cs
mono Main.exe

@NNNenov First, remove the foundation param at all, for default flowers it's hard to set up. Ground in results will be in the middle of a picture, but that's fine. Do contradictions remain? If yes, I need to see your bitmap.

In Ubuntu 16.04 running the command
mcs -pkg:dotnet /reference:System.Drawing.dll *.cs

results in the following:
error CS1061: Type 'System.Xml.XmlNode' does not contain a definition for 'Get' and no extension method 'Get' of type 'System.Xml.XmlNode' could be found. Are you missing an assembly reference?

Can't figure out what reference am I missing :( including System.Xml changes nothing.
Not familiar with mono, but really want to play with the algorithm, pls help :)

@imaginary-unit Do you have the Stuff.cs in the same folder ? The extension method in question is here : https://github.com/mxgmn/WaveFunctionCollapse/blob/master/Stuff.cs#L47

@kchapelier Ouch, somehow I didn't include it.. thanks! now it works.

@mxgmn yeah it looks like I picked the most fussy one to test first! It works fine without the foundation param. I am curious though what this foundation param means and its input values, in the example its set to 102, but the source image is only 23 pixels high?

@NNNenov Foundation is a special case of constraint. I use it in examples like Flowers, City, Platformer to make the ground level be at the bottom of the output. If you delete the foundation param from samples.xml, you'll see that ground appears anywhere in the middle of an output, not necessary at the bottom. Why 102? It goes through input image in a scanline order. First it sees a 3x3 pattern of sky, so 0 is the index of 3x3 blue box. 1 is the index of 3x3 blue box with one pixel of yellow in the bottom right corner, and so on, 102 is the index of top row earth, bottom two rows sky pattern.

I ran the program just fine, but I'm unable to open any of the .bmp files. Image viewer is giving me a message saying "File has bogus header data." Does anyone have any idea why this may be?

@BrianLovelace128 Try renaming them to png, this is a known issue which will probably be fixed in the next version ( #1 )

@mxgmn I thought I understood this but the 3x3 pattern part threw me off a little.
so 0 is the index of the top left pixel? and that pixel is the top left anchor/start point of the 3x3 pixel sector? like this? flowers ref
So each index is 3x3 pixels, and to set an anchor you count the amount of pixels in scanline order, then quanitze/divide by 3?

@gromilQaaaa @mxgmn I think the second question was if WFC can output a tiling texture. I believe you could achieve that by using a N thick border constraint on the output array, where top/bottom left/right is repeated, and cropping that from the final output?

@selfsame @gromilQaaaa Then sure, periodic="True" option generates a periodic texture. Most of the examples on the readme page are periodic.

@mxgmn So periodic means the images should tile seemlessly, then? Didn't realize that.

@nanodeath Yes. I scroll right/left up/down in videos and gifs to demonstrate that generated images are periodic.

@mxgmn Ah...I had no idea what the panning was supposed to signify. I just assumed you were generating a larger image than what was initially being shown, and then panning for effect. Anywho, glad to learn more about the codebase.

@nanodeath I also stacked 2 tiled "Rooms" outputs in the readme to demonstrate that they stack seamlessly.

@NNNenov @nanodeath Pardon, nvm, this actually can be done fast, I'll do it right now...

@NNNenov you can take a look at this version of the tiled model, I use strings instead of bitmaps that include a rotation number and parse that for the 3d display ("0foo", "3foo") https://github.com/selfsame/WaveFunctionCollapse/blob/master/SimpleTiledModel.cs

Hey! I've just been trying to understand whats happening in the data.xml file for the tilesets.
Here's my understanding so far:

these are all the types of symmetry you can define for a tile.

Symmetry types define which way the tiles' neighbor rule can be mirrored to accommodate for more connection types and cut down on the amount of neighbour definitions needed?

So because of symmetry types, all neighbour entries are defined with single neighbor values, which are then calculated for the rest of its sides based on its symmetry type

So with left = X, right would equal something that can connect to the tile on any of its sides at the given rotation, because of this, X tiles never need to have a rotation defined.
left = I, right would equal something that can connect to only the left or right side of the tile,
left = T, right would equal something that can connect to only the left or right side of the tile,
but left = T 1 (or 3), right would equal something that can only connect to that side, but not the other?

If I am correct with the above assumptions, I have some questions about the following:
if left = L, technically not a symmetrical tile, does it still mean that
if left = L, right can equal something which can connect to the right and top side?
If that's the case I guess it is symmetrical because top and right are equal and bottom and left are equal?
See image:

however, in the castles data.xml file, there's a section(line 57,58) roadturn, which is L type, and is listed twice for a Tower to the right, which would suggest L symmetry has to be treated as unique on all sides?

I still have some more questions, but they are likely to change after I learn more from these queries

In this castle example top row is <neighbor left="roadturn 1" right="tower"/> and bottom is <neighbor left="roadturn 2" right="tower"/>. What does that mean?

First, note in the Castle example tower tile has symmetry type L despite its picture having symmetry type X. I've redrawn it a little so L-symmetry would be apparent.

Imagine that we don't have any symmetry system at all. Than we also need to add lines like <neighbor left="tower 2" right="roadturn 3"/>, <neighbor up="roadturn 1" down="tower 3"/> and many more. But with the symmetry system we need only to enumerate neighbors up to a symmetry, and there are exactly 2 ways to do it for roadturn and tower - with continuations looking in the same direction or in different directions.

@CoenraadS

Step 2 fails, saying:

WARNING: Install failed. Rolling back...
Package 'Microsoft.Net.Compilers.2.0.0' is not found on source 'https://api.nuget.org/v3/index.json'.

I have tried various things without success.

@pointyointment I don't know why it fails, but you can also try building through Visual Studio:

1. Download Visual Studio 2015 Community (free).
2. Create a console C# application (file -> new project).
3. Delete Program.cs.
4. Add all WFC .cs files.
5. Add System.Drawing reference through solution explorer on the right.
6. Move all WFC data files to bin/Release.
7. Switch to release build option. Build, run.

@pointyointment

nuget install Microsoft.Net.Compilers -Version 1.3.2

Not sure what changed since I posted, but it seems a version is required now.

Not sure if this is still active but could somebody expand a bit on a 3D extension of the SW??
I was thinking of extending the XML with an "up" tag and then I would somehow need to "fix" those tiles in that level and build the rest around it??
Does that sound reasonable??

@kronpano What is SW? I uploaded a simple 3D implementation of WFC here, the algorithm is the same in 3D.

SW = software and Thanks - hadn't seen that - will give it a try.
Cheers

I want to generate a city for my voxel game, do you have a simple example, other than knots, to start understand ? thanks.

@procfxgen You mean a 3d example? 3d version is not released yet, so only Knots so far. Check out 6 2d example tilesets here, the algorithm is the same in all dimensions.

I play with knots 3d example, how to add ground ?

@procfxgen Add ground.vox and ground.png, then in data.xml add the ground tile and vertical and horizontal adjacencies with existing tiles.

Thanks, I have my ground titles now !

How to make "line" tile above "ground" titles ?
my "data.xml"

 <set` pixelsize="8" voxelsize="3">
   <tiles>
     <tile name="down" symmetry="T"/>
     <tile name="empty" symmetry="X"/>
     <tile name="line" symmetry="I"/>
     <tile name="turn" symmetry="L"/>
     <tile name="up" symmetry="T"/>
     <tile name="vertical" symmetry="X"/>
     <tile name="ground" symmetry="X"/>
   </tiles>
   <neighbors>
     <horizontal left="empty" right="empty"/>
     <horizontal left="empty" right="ground"/>
     <horizontal left="ground" right="up"/>
     <vertical left="empty" right="empty"/>
     <vertical left="empty" right="ground"/>
     <vertical left="ground" right="up"/>
   </neighbors>
   <subsets>
     <subset name="dense knots">
       <tile name="down" symmetry="T"/>
       <tile name="line" symmetry="I"/>
       <tile name="turn" symmetry="L"/>
       <tile name="up" symmetry="T"/>
       <tile name="vertical" symmetry="X"/>
       <tile name="ground" symmetry="X"/>
     </subset>
     <subset name="only turns">
       <tile name="turn" symmetry="L"/>
     </subset>
   </subsets>
 </set>

@procfxgen Try this

<vertical left="empty" right="empty"/>
<vertical left="line" right="ground"/>
<vertical left="line" right="line"/>
<horizontal left="empty" right="empty"/>
<horizontal left="empty" right="line"/>
<horizontal left="empty" right="ground"/>

It should generate vertical columns.

sorry volume is empty ....

"vertical" correspond to blue axis (Z) and "horizontal" (X,Y) to red axis in magicavoxel ?

<set pixelsize="8" voxelsize="3">
  <tiles>
    <tile name="down" symmetry="T"/>
    <tile name="empty" symmetry="X"/>
    <tile name="line" symmetry="I"/>
    <tile name="turn" symmetry="L"/>
    <tile name="up" symmetry="T"/>
    <tile name="vertical" symmetry="X"/>
    <tile name="ground" symmetry="X"/>
  </tiles>
  <neighbors>
    <vertical left="empty" right="empty"/>
    <vertical left="line" right="ground"/>
    <vertical left="line" right="line"/>
    <horizontal left="empty" right="empty"/>
    <horizontal left="empty" right="line"/>
    <horizontal left="empty" right="ground"/>
  </neighbors>
  <subsets>
    <subset name="dense knots">
      <tile name="down" symmetry="T"/>
      <tile name="line" symmetry="I"/>
      <tile name="turn" symmetry="L"/>
      <tile name="up" symmetry="T"/>
      <tile name="vertical" symmetry="X"/>
      <tile name="ground" symmetry="X"/>
    </subset>
  </subsets>
</set>

@procfxgen This data.xml

<set pixelsize="8" voxelsize="3">
	<tiles>
		<tile name="empty" symmetry="X"/>
		<tile name="vertical" symmetry="X"/>
		<tile name="g1" symmetry="X"/>
	</tiles>
	<neighbors>
		<vertical left="empty" right="empty"/>
		<horizontal left="empty" right="empty"/>
		<vertical left="vertical" right="g1"/>
		<vertical left="vertical" right="vertical"/>
		<horizontal left="empty" right="vertical"/>
		<horizontal left="empty" right="g1"/>
		<horizontal left="vertical" right="vertical"/>
		<horizontal left="g1" right="g1"/>
	</neighbors>
</set>

and this samples.xml

<samples>
	<sample name="Knots" X="10" Y="10" Z="10" periodic="False" screenshots="2"/>
</samples>

should generate vertical columns.

If you want 3d, I think it's better to wait for a proper 3d release in September-October, it'll be much easier to experiment with, or try VoxModSynth.

@procfxgen Yes, vertical corresponds to blue in MV, left=top, right=bottom. Horizontal - to red, and then it mixes red and green with symmetries.

@mxgmn, is there a way you can close and lock this issue? Right now it seems to get reused every time anyone has a question (and emailing 23 people in the process), when really those questions should be new issues. Thanks!

@nanodeath Oh, didn't know about that, closing.