While it may sound trivial, it's an important step to keep things organized: Create a directory on your hard disk that will hold your custom scenery sets. You should also create a subdirectory within for each set. Within each of those it is recommended to put each Custom Scenery (CS) object along with all belonging files into it's own subdirectory.

This process is very much beyond the scope of this document. You need to get a suitable 3D modeller and read a few tutorials on how to use it. Here is a list of the modellers used most often for creating custom scenery for RCT3:

For more detailed information and links to less commonly used modellers as well as modeller specific tutorials see Belgabor's software page.

For creating your models, you should keep the following guidelines in mind:

As stated above you need to use bitmap textures for your custom scenery 3D models. A further prerequisite for the final texture you'll use in the importer is that it has to be square and its width and height have to be a power of two (for example 64x64, 128x128 or 256x256). Note that this size can have an effect on the objects load time and the amount of memory needed later in the game leading to lag, so don't make them bigger than necessary. I'd recommend to use 256x256. If you have a very detailed texture you could use 512x512. If your object is single-colored, even a 4x4 texture is enough (maybe even 1x1 works, but I haven't tested that).

The first (and hardest) option to obtain a texture is to draw it yourself using a bitmap editor like Adobe Photoshop or The Gimp. Even if you don't want to draw your own texture it is a good idea to have a bitmap editor around to resize or manipulate them.

The second option is to find a suitable texture on the net. There are lots of free (and even more non-free) texture sites out there. One thing you should keep in mind is not to violate copyright. It is not necessary to say something is protected by copyright, copyright is automatic! So if a site doesn't explicitly say you are free to use images or textures on it, you may not. Also remember that symbols and brand names can be protected by copyright or trademark laws, so it's better not to use them. If you're annoyed by this, remember it protects you as well. So whatever CS you create, others may not host the set or rip your models or textures without your permission =)

A third possibility is to use a special texture creation software. A good (and free) example is Wood Workshop by Spiral Graphics, which is a tuned-down version of their commercial texture creator, Genetica. They also offer free texture packs which can be used with the Genetica Viewer (also free). There are also other texture creation software packages, just Google for them (and tell me if you find a good free one :-P ).

In whatever way you get your texture, it is always good to get a seamless one. A seamless texture is a texture that doesn't have a visible rim if tiled (checkerboarded). This allows you a bit of sloppiness when uv-mapping or getting a more detailed looking model with a smaller actual texture size.

You also should create an icon texture at this point. This is a bitmap that will hold menu icons for your theme. It has the same restrictions as a model texture, the only thing that is different is that you can (and should) use a PNG with transparency here, otherwise the alternating white/gray background will not show through. The standard size is 512x512 and usually 64x64 icons are set up. You don't need to create the final icons at this point, but at least a temporary icon texture is needed. Icons are later numbered starting at the top left, going right first and then down (like western writing).

UV-Mapping is used to “assign” a (bitmap) texture to a model and is done inside your 3D modeller. I put “assign” in quotes since technically it's not correct. What you do is give the vertices of your model an additional set of coordinates (additional to its spacial x/y/z 3D coordinates) in so-called texture-space. These coordinates are called “u” and “v” (hence uv-mapping) or “s” and “t”. There is a difference between these two naming conventions but that doesn't need to concern you for creating custom scenery. You also should know that these coordinates are relative. That means 0 represents one end of the texture and 1 the other one, so the size of the texture you use for uv-mapping can differ from the one you use later in the importer, only the layout of the texture has to match (ie. don't mirror it).

While this may sound complicated or strange, it just tells the model (and later the 3D engine) which part of the texture to use for which part (face) of your object. So what you should remember from the explanation in the previous paragraph is:

As above for creating the model, here is a list of things to keep in mind about uv-mapping:

As long as you are still in your 3D modeller you should take note which coordinate system it uses. We need two properties, which axis points up and its handedness. The first is easy, just have a look whether the x, y or z axis points up. The second is a bit more tricky. A coordinate system can be left or right-handed. Here is how to determine the handedness:

In most cases you get a right-handed coordinate system.

The importer only supports loading ASE and MS3D files at the moment. If you can directly save or export to one of these formats, do so and skip this section. If not, you need to convert your model to ASE. The free converter of choice is Biturn. Get it and convert you model to ASE (3ds max ASCII) format. It's not recommended to convert to MS3D format as Biturn is known to do strange coordinate system conversions when converting from MS3D, no one knows what it will do if you convert to MS3D.

Maybe you already did this, if not, get the importer form the home page on sourceforge. It is distributed as a ZIP file, put the contents into a directory of your choice. Updates should go into the same directory as some settings are stored inside a small file in this directory. Always make sure you overwrite all files when you update.

The OVL file format has been designed for RCT3 by Frontier. You don't have to know everything about their internals, but there are a few things you have to know:

After starting the importer you'll see the main window of the importer:

Figure 1. RCT3 Custom Scenery Importer, Main Window

The first thing you should decide is which theme type you want to give your set (1). This influences where it appears when a user filters the scenery by theme (the buttons at the top of the scenery menus). Note that the last four types only work if the user has Soaked! or Wild! installed.

The next thing to decide is the prefix (2). This will be prepended to scenery OVL names and the set directory. It should identify you as the creator, so set it to your screen name or to an abbreviated form of it. You should also end it with a separator of some kind, recommended is a -. At this point you can also save this prefix, choose File → Save Default Prefix from the menu. If you do this you won't have to repeat this step for you next theme.

Now enter the name for your theme (3). Together with the prefix this will form the name of the directory in Style\Themed where your set will be installed to. It is not displayed to the user in the game.

Now it's time to create the first scenery ovl, so press the Create OVL button (7) in the main window. This will open the Create OVL window:

Figure 2. RCT3 Custom Scenery Importer, Create OVL Window

Before continuing with the creation process let's take a look at how lists work in this window (and windows you open form it). All lists have a common interface. Some specific lists may lack certain elements or have more, but basically they all work the same. For example take a look at the texture list (4). At the top you can find an up/down control that allows you to change the order of the items. Below it there's a group of buttons that allow you to add a new item (+), edit it (E), copy it (C) or delete it (-). The flat C button will delete the whole list. Double-clicking on a list entry will usually perform the same action as selecting it and pressing the E edit button. Don't worry, all buttons will show a short help text when you hover the mouse cursor over them for a bit :-)

Now lets start.

2.2.1. Add the texture

First you have to add your model texture, so press the add button (+) in the texture list (4). This will open a file selection window, so go on and select your texture bitmap file and press Ok. You will then get the Add Texture window:

Figure 3. RCT3 Custom Scenery Importer, Add Texture Window

The Texture Name (a) and Texture Filename (b) should be filled with the name and path to the texture file you chose. Basically there is nothing you need to change, although you can change the Texture Name (a) if you want to. When you're finished, press Ok (c). If you get an error message this usually means that something is wrong with your texture bitmap (review Section 1.3, “Obtaining a bitmap texture for your model”). Fix the problem and press Ok (c) again. If you need to change the file, press the Open button in (b) and select the correct one.

Note

If you press Cancel in the first file selection windo,w you get the Advanced Texture Settings window. This is not covered here.

After adding the texture it appears in the list (4).

2.2.2. Add the model

Back in the Create OVL window, press the add button (+) in the model list (5). You will get the Model Settings window:

Figure 4. RCT3 Custom Scenery Importer, Model Settings Window

First, press the ... button (b) and select your model file. If you get an error, review Section 1.2, “Creating the 3D model” and/or Section 1.4, “UV-Mapping”. Before continuing, have a look at the group list on the right. If there are only dark red (maroon) entries (like the root entry (e)), you probably forgot to uv-map the model (review Section 1.4, “UV-Mapping”). After opening the file, the name (a) will be pre-filled based on the model file name, you can change it if you want.

Now it's time to setup the model transformation matrix that will convert the model from the coordinate system your modeller uses to the one RCT3 uses. Use this table to find out which matrix is needed:

Coordinate System	Modeller	Matrix
Left-handed, Y-up	Some 3DStudio/3DS max versions	(none)
Right-handed, Z-up	Most 3d modellers (e.g. Blender)	Fix Orientation
Right-handed, Y-up	MilkShape	MirrorZ (Automatically set since v16fix5)

If you need a transformation matrix, press the Edit button (c) to open the Matrix Editor and press the button name in the table above. Close the editor by pressing the Ok button. Back in the Model Settings window you can now press the Save Default button (d). The transformation matrix you chose will then be applied to every new model you add, so you won't have to repeat this step.

The next step is to assign the model texture to your group. Usually you should have only one for your first object. If you used Biturn to convert your model there will be an additional group called “root” (e), just ignore it.

Click in the Texture column of the group (f) you want to assign a texture to (It's name currently should be bright red).

Select the model texture from the drop-down list. If your object has more than one group that should get the same settings, Ctrl-Click on the name of the group you want to copy the settings from and confirm that you want to copy the settings.

We are now finished setting up the model, so close the Model Settings window by pressing Ok (g).

Back in the main window we'll now add an icon texture, icon references, text strings and the scenery item.

2.3.1. Add the icon texture

Press the Icon Textures button (6) to get to the Icon Texture Management window:

Figure 5. RCT3 Custom Scenery Importer, Management Window

Note

As essentially all management windows look the same, no more screen shots will be shown.

Now press the Add button to get to the Icon Texture window:

Figure 6. RCT3 Custom Scenery Importer, Icon Texture Window

Press the Load Texture button (b) and select your icon texture. As with the model texture, the name (a) will be filled in automatically, but you can change it if you want. Press Ok (c) when finished and close the management window.

Note

As the management window implies you are not restricted to only one icon texture, so if you want to create a really large set you can add more later.

2.3.3. Add text strings

Text strings represent the menu text entries the user will see in the game. Open the Text String Manager window (8) and press the Add button:

Figure 7. RCT3 Custom Scenery Importer, Text String Window

The only thing you need to enter is the text you want to present to the user (b). You can also enter a name (a), but if you leave that box empty the text will be copied over when you close the window. Now enter a group (sub menu) name for your theme, probably the theme name and your screen name in some combination. A good idea is either to put your name in front (“xyz's abc set”) or last (“abc set (xyz)”). Personally I prefer the latter as I tend to remember the set name but not who exactly made it.

Note

You can also make scenery items without a group, but this is not recommended. They will appear in the big list with all the original game items and most likely be missed by the users. Also this list is already too big with both extensions installed, so please don't make it longer than necessary.

After entering the menu text for the group, close the window by pressing Ok (c).

Back in the manager add another text string for your scenery object. The process is the same. When you're finished, close the Text String Manager window.

2.3.4. Add your scenery item

Open the Scenery Item Manager window by pressing the respective button (5). After pressing Add you get the Scenery Item Settings window:

Figure 8. RCT3 Custom Scenery Importer, Scenery Item Settings Window

First, press the Select OVL button (a) and select the OVL you created above (Section 2.2, “Create a scenery OVL”). Next enter a location (b). This is the subdirectory of your installed theme the OVL will be placed in. If you can't think of something better, use misc. When you add more items to your set later, you can use the drop-down list to select locations you used before. As this translates directly into a directory, only ASCII characters are allowed.

If you don't want to use a group you have to disable it using the check box (c), but as mentioned above this is not recommended. Otherwise select an Icon reference (d) and Name String (e) for the Group.

You always have to select an Icon and Name String for your Scenery item in (f) and (g).

Next set how much the item will Cost and the Refund (j). Actually the latter is a misnomer, it is the cost of removing the item, so if you want a real refund, enter a negative value. The values you enter here are measured in the smallest unit of the users configured currency (e.g. cents for Dollars or Euros).

The Scenery Type (k) selects in which menu and category the item will appear. For your first item, select Small Scenery. Leave the Support Type (l) at None and set Extra Parameters (m) to None as well.

All Position parameters (n) should be set to 0 (zero), the Size in squares (p) both to 1. The Size (o) should be set to the size of your model in modeller units. You have to keep in mind in this case that x/y/z here refer to the game's coordinate system. This doesn't matter if you didn't need a model transformation matrix or use MilkShape. If you had to use the Fix Orientation matrix you need to shift the values “one up”, so the size in the x direction in your modeller goes into Z, y into X and z into Y.

The Placement Flag (q) selects how the game will position the object in relation to where the user clicks. For your first object, select Full Tile. If you want to know more about this setting and how you need to position your model correctly for them, see Belgabor's facts & figures page.

We don't need to go into detail for the Unknowns (r), not much is known about them anyways. Set Unknown1 and Unknown2 to 0 and enter 0 (zero) for all others. Leave the flags alone.

Note

You can use the Save SID as button (i) to save the Scenery Options (with the exception of Cost, Refund and Supports Type), Unknowns and Flags to a file for later reference (e.g. when you want to create several items with the same settings). You can open these files with the Open SID button (h). There is also a library of sid files dumped form game objects on jonwil's page.

You're finished here, so press Ok (s) to close the window. Also close the Scenery Item Management window.

Now we nearly made it. Choose File → Save Theme File from the menu of the main window to save your theme file. Now press the Install button (4) to install it. It will be saved to <RCT3 Installation Directory>\Style\Themed into a subdirectory called PrefixThemename. If you don't have RCT3 installed, you will be able to select a directory to install to instead of <RCT3 Installation Directory>\Style\Themed.

Now start RCT3 and test if everything went well.

Congratulations, you now have imported your first RCT3 custom scenery object =)