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V3d_Viewer::AddZLayer() has been replaced by V3d_Viewer::InsertLayerBefore() and V3d_Viewer::InsertLayerAfter() methods allowing to specify Layer settings and index of existing layer to insert new one before/after. The behavior of V3d_Viewer::AddZLayer() has been adjusted to append new Layer before Graphic3d_ZLayerId_Top (between Graphic3d_ZLayerId_Default and Graphic3d_ZLayerId_Top). Graphic3d_Layer now provides LayerId() property. Graphic3d_ZLayerSettings has been extended with IsRaytracable() property; Ray-Tracing now processes multiple layers instead of Graphic3d_ZLayerId_Default. Moved some methods from OpenGl_View to the base class Graphic3d_CView.