Jack Ha d77f6e86e4 Added an extruded convex hull as a raft instead of a grey plane.
- New shader transparent_object.shader
- Raft thickness is calculated in BuildVolume and used in
  ConvexHullDecorator, notified by a Signal.
- Removed old grey plane from BuildVolume.
- Vertex data below build plane is no longer discarded (caused convex
  hulls that are too small).
- Uses new functions in MeshBuilder (update Uranium as well).

CURA-1707
2016-07-25 16:45:38 +02:00
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