@arcman7 so my approach of generating the terrain mesh at design time in Unity using the Terrain Building tools and all its features (With no 65,535 vertices limit on exported meshes anymore) and creating the Bullet/Ammo btHeightfieldTerrainShape at runtime using the actual heights from the Mesh (so i dont need to duplicate the heights in a raw float array or png texture, I take them right from mesh i am providing collision for)
But it is working smooth… all right from the Unity Editor, Out-The-Box with no extra coding or setup… Just make your terrains in Unity using ANY terrain tool from the Unity Eco System that works with the native Unity Terrain System
Freakin sweet… Take a look at this: