I have attached a short video clip which demonstrates what happens on a MacBook Air with Intel HD 3000 graphics. I don’t see this when running on my Nvidia powered VAIO. Both Chrome and Firefox exhibit this behavior, so it may be a core WebGL issue.
I have disabled ( by commenting out ) SkyBox rendering and used a cyan color for the background. This problem occurs every time map tiles near the horizon have to be rendered, regardless of their source. It appears as if the renderer is trying to clear the background with a black color, but I’m not sure this is the case. I would be happy to get my hands dirty if any of you could point me in the right direction, but I have to tell you that I am GLSL-illiterate :-/
Happy New Year!
MacIssue.m4v (3.06 MB)