Easy construction of tabular mining

t.zip contains the mine plans pictured above.  Unzip t.zip to create t.pnt To display these construction lines in Map3D, use File > Open (Construction Lines) and select t.pnt Begin building the floor plan, using CAD > Build > DDLoop. Enable trace snapping by selecting CAD > Snap > Trace Snap. Specify the maximum element width as 0. Select OK. Select the points on the construction lines to define a perimeter loop, as illustrated above. Close the loop by selecting the first point again. From the entity properties dialogue box, specify the desired colour then select Build. Select YES when asked if you want to trace around interior loops. The elements within the loop will now be constructed. Construction of Dyke. To construct the dyke, trace the loop around the floor plan of the dyke as above. Close the loop by selecting the first point again. From the entity properties dialogue box, specify the desired colour. Now change the element type to Fictitious Force. Specify the block extrusion vector as (100,200,500). Select OK. Now select Build. To copy the upper part of the dyke below the plane of the mining, use CAD > Edit > Copy Entities. Change the selection mode to Select by Colour. Double click on the dyke, and specify (-100,-200,-500) as the copy offset vector. Select OK.