[bigans]

Yes Kevin,
first picture Catania's Harbour, you can see that I place a lighthouse on a pier, but the merging feature don't let to see the low side of the lighthouse, in that case 2 steps/stairs. We try to use the comand F4 MouseRight=Zmove but the object makes little jumps and don't reaches the right height:


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Second picture Messina's harbour, we want to place rails on the piers, but we aren't able to do using the comand F4 MouseRight=Zmove
2d view


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You can see that I correctly put the rails, but in 3d look at the result


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The rails disappears as merging into the piers...

Thanks for the help you'll give me