take object as unit instead of volume Change-Id: Ie8220b183349aac86193021f6a41a5a836231dce
1. set the unprintable volume to black even if it is mmu painted 2. add the bounding check logic when the object is partly inside of current plate Change-Id: I69ce25eb85a71398ed8fb1d275136c5d943796d6
let the black color not hard to see at the 3d page Change-Id: Id739a589c2f28781e646fb59e50ed270eb2f0e91
using version 1.0.10
lane.wei