Hey there @zegrox! Welcome to the community! Unfortunately the landscape system was designed to be done before compile time, so editing it at runtime is not intended and would be a decently large hurdle. Though if you have the engineering chops you are welcome to try and this article could point you in the right direction. However, as many of the comments pointed out, while this may work it has many issues. It’s more recommended to create your own landscape system. The tutorial below can help you get started, though it uses noise instead of height maps originally so you’d have to make that change yourself:
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