I''m trying to use 256x256 buffers for my vertices so I can stay with 16-bit index buffers. However, when I try to line up the patches I get problems with textures (using texture splatting). I have to repeat a vertex in order to avoid a huge crack in the ground, so my vertices look like this:

. . . . . . . .
              . . . . . . . . 

Suppose the top row has a green texture and the bottom row has a brown texture, and I want them to blend with each other. Normally the splatting would take care of this but in this case it won''t. The top row of vertices has no idea that its matching pairs also have a brown texture. Is there any way to get around this?