The bus's wheels are not turning properly

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    Good afternoon! This is my first time making a bus mod, and I've encountered a problem shown in the pic. Could you please give an advise on how to fix it?

    Wheels turn around their local Y axis.


    There are two ways of causing the problem You show:

    1. Use of an improper transformation matrix on a properly applied part. The parts matrix in the .mdl should be { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, X, Y, Z, 1 }, with XYZ being the parts local coordinates.


    2. Use of an improperly applied part. Look at the wheels properties in whatever 3D drawing program You use. If they show a local rotation (likely by 90° about the X axis, so 90°-0°-0°), do not change the part but apply its properties. The local rotation needs to be 0°-0°-0° to match the above mentioned matrix.


    You can reach this function in Blender in the object mode via Object-Apply-Rotation; Scale and Rotation is suitable as well in case they are not only improperly rotated but also scaled different than 1-1-1.

    Thanks for your answer! I use Blender 4.0, if it matters. The rotation and scale are absolutely similar to what you say. The parts matrix in .mdl is also the same. But the issue still persists. Could you please help me to find out another solution? Thank you in advance.

    You can try this:

    • In Blender; Select each Wheel/Axle separately and rotate on the X Axis 90 degrees. Then select and make this position the new origin (0,0,0) for each wheel/axle (ctrl+A and pressed rotation).
    • Import the Model in Model Editor
    • go to each Wheel/Axle and rotate them X Axis -90 degrees BACK to their true position.
    • Set the Wheel/Axle information in the metadata.

    Magically, this should stop the "Propeller" Wheel effect. I don't understand the science behind it, but it works...

BlueBrixx