Hi Kandeep,
Try deleting your saved and intermediate folder in your project then open your project and build. Then reopen the map and see if the problem persists. (This may not fix anything but is a good initial step)
Also got some questions.
- Where you see all the black splotches is that a seam where two pieces of geometry meet?
- Are you using Instanced or Procedural meshes?
- Are your meshes children who have been rotated at different angles from the parent?
- Could you take a screenshot of your lightmap density when the map looks bad? (see screenshot to see where this is located)
