✈️ Contrail Lab: Schmidt-Appleman Mixing Line, Ice Supersaturation and Persistence - 3D

A Blender-built airliner at cruise altitude over terrain and cloud: the contrail from both engines forms, sinks in the wake vortices, fades or spreads according to the same Schmidt-Appleman and crystal-diffusion physics as the 2D lab, with a guided tour and seven in-page numerical checks.