Add the data model for showing contour maps inside a regular 3d view. RimContourMapInView is a presentation wrapper that decides where a contour map is placed vertically in the 3d scene and what parts of it are drawn; the contour map itself, including the result, the aggregation and the computed geometry, remains owned by the contour map view it points at. RimContourMapInViewCollection owns the set of contour maps available in a 3d view. Add a CONTOUR_MAP entry to RiaDefines::ItemIn3dView so the project tree can be refreshed for just the contour map items.
Magne Sjaastad