Depending on how much an object is deformed by modifiers, the Hot-point (centre axis) will change to stay in the centre of the object, which is why the deformed terrain is above the level where the flat terrain was.
There’s no such thing as the floor but there are a couple of ways to move things to a specific point in carrara..
.. try this.
Select the terrain object,.. Switch to the Directors Camera (if you’re not already using it),. then press ” 0 ” (zero)
this will Zoom the camera to fit the selected object into the view.
you can then manually position the terrain where you need it.
Or,..You can hit “Caps lock” and then adjust the position of any object’s (hot-point) (the three R,G,B, arrows) without moving the object.
this allows you to position the hotspot on a specific point in the model, then you can move the model where you need it.
You can Hit Caps lock again to “lock the hotspot”.
once the hotspot is locked, you can move it to position the object where you need it in the scene.
Use the split views, if you need to move things around in the scene, since it gives you an “overall” view of the scene from the Top, Left, front etc…
and it’s much easier to select and move objects in a BIG way when you’re not looking through your camera1.
Use the Directors Camera a much as possible for working in the scene,.
If you find a nice view / angle,. you can save that position in the Camera menu,. then change to your main camera, and load that saved position,. ..
another way to adjust the terrain is to use the “motion” tab on the right, which gives you the numeric values for X, Y, and Z,. you can adjust the Z (height) there.
Or you could create an object,... EG: a Target helper object,. then select your terrain and go to EDIT / ALIGN
you’ll get a little pop up window with three arrows,. you can click on any, or ALL of the arrows to align the objects to the same point.
In the terrain editor, there’s also a “filter” to Zero the edge of a terrain,. as when you add terrain generators like Mountain, they deform the sides of the terrain ,(so it can be Seamlessly tiled) .
If this isn’t what you need,. you can add a “Zero edge filter” which will level the edges of the terrain, and allow you to adjust the filter effect
I hope some of that makes some sense to someone..