I have been creating materials on mesh objects for Second Life by selecting an area of vertices and assigning a new Material to it. When I export to Collada/DAE and upload to SL, each of the Material areas appears to have a line/shadow around it. I have also been using Separate by selection to divide larger mesh objects into smaller mesh objects, but I get the exact same outline/shadow between mesh objects. Is there some setting or procedure that is optimal for creating materials/objects for Second Life?
Here is a snapshot of how it looks in SL:
Adding a screenshot of my Blender setup.