As it says; how do I downsize terrain, but keep everything about the generated terrain exactly the same?
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Depends on project structure
But in general you may export current result, import it to a new project with smaller scale, adjust height with Clamp device and ta-daa, i guess 
Generally, World Machine is resolution independent, so normally you would just set the scene resolution to what you want.
Are you working from a particular size file input, or just working on a project at some resolution and want an output that is as close as possible to what you currently see?
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Responding from another account. What I am doing is generating a terrain in one file, and importing it to be used in a combiner with another terrain in another project. The imported file is supposed to only cover a certain portion of the map (I am using a mask). However, it ended up being that the terrain I generated was too big to fit on just the section of terrain within the extent I wanted. I either had to push a lot of the imported terrain out beyond the border of the extent (which will probably create issues), or downsize within the project, which will create some issues about less resolution than I could have gotten with a nap that was already smaller to begin with.
I did try to recreate it as best as possible by simply mechanically downscaling all settings in the file I use to generate the terrain, and it is adequate. But I get stuck on wanting that exact terrain because I fell in love with it.
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@Tarek_E So you want to basically place one terrain onto another terrain of larger size? But then your piece of landmass is not properly resolutioned according to your bigger picture landmass?
The scale of your terrain is arbitrary, for use in erosion etc. When matching two separate terrains generated in different scales, your width to height ratio, and your build resolution, matters a lot more than just xy scale.
You can scale a file input proportionally in layout view, place it appropriately in your bigger landmass.
This is not a perfect method that works universally, but here you go..
- First, in your second project with the bigger landmass, import your previously generated terrain using a file input.
- Check if it imported alright, then combine it using a combiner, add mode, full strength.
- Now lock preview on the combiner, select your file input containing first piece you want to scale, then go to layout view. Scale and place your file input properly there.
Adjust your prefered combination method only after you have everything in it’s place in layout view.
Good luck!
The layout view approach makes sense for placement, but I’d add one caution about the proportional scaling: if the source terrain was built at a different build resolution than the larger landmass, erosion features won’t line up in scale even after you stretch it in layout. Worth checking the width-to-height ratio on both sides before combining, since that’s what the poster flagged as mattering most. Locking preview on the combiner first is a good tip too, otherwise it’s easy to lose track of which input you’re actually adjusting.
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The layout view approach is what I’d focus on. Since the two terrains were built at different resolutions, matching width-to-height ratio and build resolution matters more than tweaking the xy scale, as was pointed out. Placing the file input in layout view before touching the combiner settings keeps the mask extent honest. One thing to watch: check the imported terrain’s height range against the larger landmass before combining, or the seam will read as a step rather than a transition. It’s worth the extra pass if you want to keep that terrain you’re attached to.
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