Now before you start please install the following:
Blender
Download it to wherever you want on your computer.
NadeoImporter
Download and unzip the file to your Program Files (x86)\ManiaPlanet folder.
Maxi031's ConvertAssistant
Download it to wherever you want on your computer. Open it, click 'options' and locate your NadeoImporter.
Now create the following folder:
\Documents\ManiaPlanet\Workblocks\Stadium or \Documents\ManiaPlanet\Workblocks\Common Inside of one of these folder you create your object-folder (name it whatever you want). You'll end up with \Documents\ManiaPlanet\Workblocks\Common\CoolObject
Your video tutorial:
[video]http://www.youtube.com/watch?v=oP2r8opScEM[/video]
In the video I didn't fully explain how to create an .xml-file, but what you have to do is simply copy the following:
<Object>
<Pivots>
<Pivot Pos="0 0 0"/>
<Pivot Pos="0 0 -1.5"/>
<Pivot Pos="0 0 1.5"/>
</Pivots>
<GridSnap HStep="8" VStep="8" />
</Object>
and paste it into Notepad. You should then have to save the file into your object-folder, and as <Objectname>.xml (All files, not as a .txt-file)
Useful links and a nice ruler:
Custom object specifications thread
Hawk's thread for useful TM2 tutorials and link
Hawk's ruler (to measure objects)
Hawk's object demonstration video
Hawk's tutorial for 3dsMax
Thanks for reading/watching. Any question is welcome.