Importing 16k*16k heightmap on 8GB on vram

Hello! My quest for large-scale realistic open-world car game continues.

I’ve downloaded and processed a stupid amount of heightmap data which I’ve compiled into 4 8129px*8129px heightmaps named …x0_y0.png:


I hit import and it bumps from 0% → 50% → 100% and the loading dialog disappears. Then about 2-3 min goes as my GPU’s memory fills up until it finally says that I’m out of GPU memory:

I’ve tried closing every non-needed operation on my computer, still no import. Is there a way around this or do i need to bulk up my computer? If I need to solve this with my wallet: how much vram do I need for a 16k * 16k heightmap import? I currently have a 1070 with 8GB

Should be completely fine.
The minimap that shows the tiles is what you want to close.

Try importing the tiles one at a time and manually positioning them.

If you are able to open a single level on its own, then you have enough vram to work, even if it gets complicated.

If you don’t, you can re-slice the maps to a 4km variation.
16 tiles instead of 4.
The asusmption there is you should be able to comfortably load 3 tiles at a time to work on.

All else fails, get a 3090…

Also, be sure to pick the 2x2 component count and the version of the map just under the maximum which allows for 8km but has more overall components. If you really must use the landscape system…

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Nice! I imported, hid and then imported the next one for all 4 tiles. Now I have 4 landscapes in the map:


but that’s a future problem, this will due just fine for now.

It’s crazy how large it is, thanks for the help !

Video for scale: