hi! there is a mod i'm fixing , i have a few problems with it: -Exhaust smoke (and backfires) appear on left , when exhaust is on right -The air vents won't appear on the game , but they are on Blender There is fix to those things?
Typical problems with using unedited Jbeam from an official vehicle. The proper way to fix it would be re-jbeaming the entire car from scratch which is not easy. And your attempts at "fixing" it can probably only make it worse.
Exhaust smoke is controlled by a chain of beams that act as an exhaust. The origin point of the exhaust simulation starts at a node that is given the isExhaust property (in red on the image above) then you need to create a chain of beams that follow each other and are given the isExhaust property as well (in yellow on the image) BeamNG will automatically create exhaust smoke at the latest beam. In your case all you need to do is move the exhaust nodes in your exhaust jbeam to match your model's exhaust and you'll be set. One thing to keep in mind is that the last 2 nodes of the beam chain will be used to determine the orientation of the smoke coming out. This is explained on the Engine Thermal Simulation wiki page. Most of the wiki is still up to date and can still be used to make vehicles.