I am trying to make a grass terrain surrounding a house, so I need to use several planes of displacement terrain. However, since they're not all the same size the displacement grids don't line up and I can't keep the meeting edges on the same height. How do you usually solve this?

http://img361.imageshack.us/img361/6692/untitled1ve2.jpg

Okay, so I know about Sew, but they still need to be aligned for that. And I don't know how I can create a displacement surface that will do that, since I have to make the brush at a specific place and specific size. I can't just make them all the same because then they wouldn't fit the rest of the map.

Also, when I lower points on the displacement, it get's slightly pulled sideways aswell, not just up and down. So If I lower a corner it can create a gap betwhen the wall it was upp against =/

You can sew to adjoining sides such as the side and top. Then you would not see a gap.

Your reply is quite vague, but ok..

I sellected both grass displacements and hit Sew, and it only connected one of the corners together, while leaving the whole row that I want aligned untouched.

I just thought of another reason why it might be vague. I often subdivide the top surface of a brush and the sides of the brush that plan to be touching another piece of terrain. However you may have only subdivided the top face.

My method allows you to fill in those holes using the side of the terrain brush.

I must ask.. in what circumstance are you unable to create terrain patches that don't line up with each other? If you must stick some out of the skybox, then do that.

I ran a test example where I created a terrain patch, built a box (represents a building), and carved it out of the terrain. The terrain then didn't exactly match up anymore. But when I adjusted the terrain so as to move the building in one direction by a about 32 units, everything lined up again and the terrain looked great.

Sorry, but I don't get what you are trying to say.. subdeviding the sides? How is that practical? I don't see how that could help aligning the top of the brush at all... and your "test example" tells me nothing except that you know how to do something I don't.

Look at my picture I posted, I think it's pretty clear what I'm trying to do. I have one really big piece of terrain with a nice square grid, that I'm trying to match up with a thin long piece of terrain with a rectangular grid..

---------------------
|.....................|
|.........1..........|
|______________|
|..|
|2|
|_|

I see your example and I don't see why you can't create a piece of terrain where those horizontal and vertical lines match up. When creating multiple terrain patches, all patches should be a multiple of the largest patch. For example, if your largest patch is 1024, then the other sizes you can use are 512 (1024/2), 256 (1024/4), 128 (1024/8). Doing so will allow your patches to line up and you will not see any gaps.

Look at this first picture and notice that the top, middle patch lines up nicely. The bottom does not line up and no matter what you do, it will never line up unless you keep it all flat.


Look at this next animation of how to make the above terrain work... or at least fake it.


1- I kept the selected the touching sides of the brush as well as the top of the brush before subdividing it into the terrain patch. Notice that there is a top and side selected in the first image.

2- Then I bumped the two top patches (not the sides) to simulate what you have going on.

3- Finally, I selected a top and side patch of one brush and sewed them together. Then I did the same to the other brush. Technically, the terrains still don't line up. But the brush side that I sewed to the brush top fills in the hole that would otherwise be there.

Okay, I'll admit, that teqnique works great :P

Thanks allot!