a little script I put together can turn an obj file into landscapes! I borrowed the code from Ultimate Doom Builder. All the other stuff you see in the pic is a 3D model
cast a ray from the player’s crosshair. If it hits a floor then halve the render distance (8000mu to 4000mu). “Render distance” here being a custom thing of mine since gzdoom renders everything by default. Works really well for this area where the huge hill obscures the valley on the other side.
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Multithreading helps, that was a pain to get working with distance culling.