Can vts backend support merge mosaic from different area with the same terrain data?

[Davionshi]

Hi, I have a global texture data file,but it is too huge, so I clip it into serveral small files, such as [-180,-135],[-135,-90]... and I also clip the dem data with the same standards, but after I processed these areas and try to merge them, there are some black lines on the earth.

I want to remove these black lines, and I guess that these black lines caused by splited dem, so I want to know that if it can work if I only split the global texture, then process these seperately area with the global dem file, and merge these areas together in final.