In Blender
Object Mode > Add PlaneObject Mode > Scale & Transform & set Delta Transform Scale X .50 - Y .50 - Z 1.0Edit Mode > Subdivide & Loop Cut for square subdivsEdit Mode > Face > smooth shadeObject Mode > Modifier > Displace - Strength 1.0 Midlevel 0Object Mode > Modifier > Smooth Factor 0.5 Repeat 5 (base on look)Export > Wavefront (.obj) Scale 1.0 Include Selected Items Only Forward Axis Z (positive) Up Axis Y Normals Apply Modifiers Triangulated Mesh Materials - Off