Latest Whitehole release: v1.2.

Whitehole requires Java JRE7 to run properly. And perhaps JDK7 too but hopefully not.

Whitehole should run under Windows and Linux. It also runs under OSX but I don't support it.

Screenshot

This is v0.9 RC, but little visual changes have occured since then, so no need for a new screenshot.

Downloads
* v1.2: Download
* v1.1: Download
* v1.01 hotfix: Download
* v1.0: Download
* v0.9 RC: Download

v1.1 adds support for editing starting points, gravity objects and paths. It also makes the 3D interface easier to use.

Changelog
Just read there.

Straight copypasta from the readme

1. Getting started

Whitehole is a Java program. It is built against JDK 1.7 so it'll require JRE7 (or anything equivalent) to work correctly.
For Windows users, a little launcher (whitehole.exe) is provided for convenience. Otherwise, on any platform, you can just open a terminal/console and type: java -jar whitehole.jar

Whitehole operates on files extracted from a SMG1/2 ISO. So you first need to get an ISO. We aren't going to help you find one, though.
Once you got your ISO, you need to create a folder and extract the files in it. For now, extracting the ObjectData and StageData folders is enough, but that may change later, so if you want to be sure, you should extract all the ISO's contents.
Now open Whitehole and hit the 'Select game folder' button. The dialog shown may be disturbing at first because it looks like a file selection dialog but it is meant to select folders. Select the folder where you extracted your ISO's contents. The StageData and ObjectData folders must be directly in that folder. If everything is allright, Whitehole will list all the galaxies available.

To edit a galaxy, you select it and hit 'Open galaxy' (or alternatively double click in the list). You can also open the BCSV editor, but you really shouldn't try to use it unless you know what you're doing. The BCSV editor is a raw, user-unfriendly tool that lets you edit BCSV files, that is, many data in SMG games.


2. Editing a galaxy

Once you have opened a galaxy, you will be shown a window with lists and a white panel. The program isn't crashed or frozen or anything. Loading and prerendering a whole galaxy just takes a few seconds, so be patient.
Eventually, if everything goes right, the window will show a rendering of the galaxy.

The left panel lets you choose which scenario and zone you want to edit. It also lists the objects in the current zone under the current scenario. The galaxy preview is also interactive. Moving the mouse while holding the left button moves the camera, moving while holding the right button rotates it. Clicking an object selects it, or deselects it if it's selected. Moving the mouse and holding the left button while an object is selected, moves it. You can also use your mouse's scrollwheel to move the camera or objects perpendicularly to the screen.

The Zones section of the left panel has a button labeled 'Edit individually'. Clicking it will open the selected zone in an individual editing window. The zone editing window works pretty much the same was as the galaxy editing window. Changes made to a zone in one window only reflect in the other ones when they're saved.

The Objects tab allows you to add and delete objects. I think that part is self-explanatory enough...

When an object is selected, the Objects panel will show all of its properties, and let you edit them. It is quite raw atm, though.

3. The settings

The settings can be modified from the galaxy listing window, by hitting the Settings button. There are a few settings available:
* Check for object database updates on startup: if enabled, when launched, Whitehole will download a more recent version of the object database (objectdb.xml) if any.
* Use shaders for 3D rendering: if enabled, the 3D renderer will use shaders. This allows for more accurate rendering, but you need a compatible GPU.
* Render objects in low-res when dragging: if enabled, when moving the camera in a galaxy/zone view, the graphics will be rendered in wireframe. For slow GPUs.


Have fun

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd

Another potential problem might be the objects' l_id's. Phantom Wings said that they must be unique across the galaxy or you risk a crash, however the SMG2.5 guys say that they don't matter and are just used by Nintendo to order objects in their editor, so I have no idea who to believe. In the meantime, Whitehole allows you to change an object's l_id. If they really must be unique, Whitehole may try to handle that automagically in future releases...

Or perhaps it has to do with some extra stuff SMG2 added, and Whitehole doesn't take into account. I'll look into that.

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd

And you say shit still works on Dolphin? Hmm that is fishy. Note that Dolphin is inaccurate and likely more forgiving than a Wii (ie reading/writing to an invalid address would cause an exception on a Wii but Dolphin just ignores it).

Now, if you have SMG1, you should try to modify it as well. That way, we'd know if the issue is caused by the l_id's or some SMG2-specific crap.

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd

I figured the default parameters I coded in were right. In the meantime, try adding one object and setting its l_id to a very large value.

Or: try to move an existing object. Without altering it. Just move it, and see if that works.

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd

Are you sure that the directory you picked in the editor, directly contains the ObjectData and StageData directories? And that those directories aren't empty?

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd

Okay, so now try to open a level in Whitehole, and save it. Without making any changes. Just save it. And test it.

This way we'll know if the problem comes from editing or saving.

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd