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Coordinate axes

In the game, the truck is oriented along the OX axis. The OY axis is pointing up. The OZ axis is pointing to the left.

coordinate axes

This orientation corresponds to the (x, y, -z) axes in Maya:

axes in Maya

And, in 3DS Max, to the (x, z, y) axes:

axes in 3DS Max

In Blender, the axes are the same as in 3DS Max. So, the orientation of the game corresponds to the (x, z, y) axes orientation in Blender:

axes in Blender

Thus, to correctly export your truck to the FBX file from your 3D editor, the forward axis of your truck should be looking in the direction of the OX axis during the export.

Moreover, after exporting, when you will be specifying truck properties in XML, you should take into account the difference in the orientation of the axes, which was described above.

For example:

  1. The coordinates of the center of the wheel of your truck in Blender or 3Ds Max or are (1; 2; 3).

  2. So, in the XML description of this wheel, you need to specify "(1; 3; 2)" as the value of the Pos attribute:

    <Wheel
    Pos="(1; 3; 2)"
    ...
/>

TIP: For details on the recommended process of exporting from Blender, see Step 2: Exporting to FBX of the Simple Truck Mod from Scratch tutorial.