Better value for MaximumNumberOfPeels and OcclusionRatio of 3d renderer

See issue 1694 on redmine.

I trie to find a better compromise between perf and quality. If you want to test your own values :

MaximumNumberOfPeels + OcclusionRatio  close to 1  -> better perf.

MaximumNumberOfPeels high + OcclusionRatio close to 0 -> better rendering.