Scaling terrain from height map, x4, but making it keep it's smoothness/natural transitions

[arctic badger]

Hi, been trying for years to recreate my childhood hills, (and whole town and river and trees after) i'm so close to it but:

Is there a way in the scaling algorythm, to change what Y value it picks to do the transistions to the next one ?

I basically just need for it to choose not the closest y value change, but the block before the next Y value change, so it can automatically smooth and keep the natural/real life scale of the terrain changing height, like using the path function.

If not what can i change or learn to code into it so it may work ?
It's a 1m resolution height map, i want 1m=4blocks/1block=0,25m and it'll be perfect

Photo to compare what i've gotten;
1st is normal, 2nd is x4 X&Z, 3rd x4 Y&X&Z, 4th the closest i got x4 with small transition, and 5th is what i've gotten.

Pictures of the map in question after.

Thanks in advance

[dry musk]

You can try using the Scale2x option in axiom twice?

[arctic badger]

I did in smaller chunks but it does the same as option 4, not option 5
You mean that Quality x2, twice, should work ?

[arctic badger]

x2x2 doesnt work, because i need a weird algorythm for the Y value i guess, middle is what ive gotten, right side is what i want. The first "path" is what the scaling algorythm does, the second one is what i'm trying to get. Not just a time x4, but something on top that links the older inflated Y value together.

Like is there a way to say: Y 20 becomes Y24, Y21 becomes Y28, and a path function links them together so the terrain stays natural ?

[dry musk]

The terrain can't look natural. That's the nature of upscaling

[arctic badger]

I feel like a few lines of codes could, out of my element probably i know
So plan B; is there a way to dig into the upscaling code and change/try stuff ?

[regal portal]

why arent you using worldpainter?

[arctic badger]

Worldpainter didnt work either, same upscaling issue, no "transitions" between Y values

If you know a way there ill take it 😁

[regal portal]

why do you need to upscale?

isnt it possible to just import the heightmap press a button and generate the terrain?

[arctic badger]

The 1 block=1 meter makes it all look too small, i can't make the details in, and it doesnt feel like real life
Walking distance is perfect at x4 aswell, very close to real life
All details works too, from plants to tree to house interior
When importing the height map, whatever the settings, i run in the problem above of the transition between height change not being coded as i need it to be for this project i guess 😅