The function BABYLON.CreateGroundFromHeightMapVertexData, when provided options subdivisionX and subdivisionsY creates a VertexData object that, when applied to a ground mesh, makes the mesh disappear. Using just subdivisions option (e.g., both sides equal) works fine. Using subdivisionX and subdivisionY with both values equal does not work. Seems to occur just by using these options.
Demo of problem: https://playground.babylonjs.com/#45R5JK#904
No, I have yet to looked at the source code, and I also haven’t compared the VertexData instances in the two cases, or the resulting meshes. Yes, I plan to do more investigation, but perhaps a recent change messed something up?
BTW, the function name is not in the topic line because of some sort or word length check when creating this post.