Cutoff terrain vertices to create an island-shape mesh

Hi, I'm trying to make a floating island with terrain. General idea is I want to cutoff some parts of the terrain which vertex height is below a constant (eg. y <= 0). I stucked at the point where I saw the limit of terrain system that the generated mesh is always square. Is there anyway I can achieve this?

I also looked into customizing terrain shader to not render some of these vertices instead of cutting them off but I'm not a shader guy so I'm not sure how to approach this solution.

Thanks

 

Honestly, I would approach it by not using Terrain. Use a mesh instead (created in your favorite 3D modeling program, or possibly with the new built-in ProBuilder tools, though I haven't explored those much myself yet).

 

Thanks for your reply.

I'm trying to make procedural generated islands so I need to find a way in Unity. I know that I can create meshes at runtime but terrain editor has some useful built-in features eg. Alpha maps, LOD. So it would be great if it's possible to use terrain in this case.

 

Old: https://forum.unity.com/threads/ter...eal-world-gis-data.377858/page-8#post-3322292

New: https://forum.unity.com/threads/does-the-new-terrain-support-holes.585157/#post-3907291