Hi there Cameni !
Have a little knowledge vacuum about the watercraft parameters and their application on amphibious vehicles. I looked over the wiki (
http://xtrac.outerraworld.com/trac.fcgi/wiki/vehicle_params) documentation and wanted to ask about the draft region (from the image).
I would like to know if the draft region is taken as a part in the engine like a kind of collision mesh. After a little speculation on the BTR, i found out, that if i set the needed parameters (and the H1 and H2 above the vehicles floor plate), it obstructs on-land vehicle movements, as if the collision mesh would now be set just to the base wheel "ground level" posing like an movement retarder. Just like it would apply the draft region on the ground too. (been experimenting, s if i set the wheel suspension minimum under zero (so under the wheel "ground level") and suspension stiffnes so high, that it barely moves the wheels upwards, no drag is present, doe any boulder or rock higher the actual "ground level" makes it drag and reduces the speeds dramatically (in my engine settings to 8-4 km/h) as any terrain incline too).
-- If it is taken as a collision mesh for classical ships, is there (or could there be) a way to define another height parameter (from conus tip to the vehicle-base plate) to witch it would ignore collisions whyte the terrain ?