Hello, guys.
In next couple weeks, I'll work on San Marco's basilica model. My finish goals is: hi poly geometry for baking and low poly geometry with diffuse, spec, normal, lighting maps for Unity\UE4.
My start point here. I got a lot of reference and scetchup model downloaded from open source for build proportion.
I try to update this WIP every day, so I hope it'll be ineteresting
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Thing is, it's a hell lot of work doing something like that accurately. Those statues will be hell to model them all.
I've written something about my sketchup workflow in my thread http://polycount.com/discussion/155531/ue4-neovenezia-project-wip
For the accuracy part, Those example sketchup files are really no good. I suggest you georeference the place in sketchup and plan your proportions by using planes with images. Also be mindful of the modularity when modelling. The columns and many of the repeatable elements can be made to fit saving a lot of work.
In terms of reference, the best place I've found is the wikimedia, they have loads of high res images of the piazza. Google street view with panoramio images are also a godsend.
All in all, good luck. I'm looking forward to see what you can come up with.
Here is first update
I use 3 plan (but they all different) and a lot a photo. I try to catch right proportions.
About sketchup model, you was right, it is bad idea from start.
a lot of proportions tweaking