Sunday, November 12, 2017

WHERE'S WALLY? PART TWO

Walworth is in London, south of the river.  I'm still getting to know St Peter (my favourite of Soane's three London churches) by means of a BIM model.  This is where I got to last weekend.  Three major areas of progress: Planning, Interior & Context



I received a link to a floor plan from Kamran Subhan, an old friend and long-time Revit user.  He had come across a nice little cache of information about the church on the Survey of London website.  Based on this plan, I re-adjusted the spacing of the windows, pulling the central row of 5 closer together and confirming various aspects of the general planning.  Ultimately I realised that this plan is not quite accurate either, based on photographic evidence and my own visit a couple of years ago.  As usual, with Soane's work, the drawings are very interesting, but none of them necessarily represents the definitive version of what was actually built.



I came to realise during this process that all three of his churches follow a common planning structure.  I'll describe St Peter, but the other two are variations on the same theme.  There are square volumes at each corner which carry the vertical circulation.  Connecting these in pairs is a lobby or loggia comprising a procession of arches.  I was aware of this structure in the one at the back, because it is open to the elements, but I hadn't realised that the entrance lobby was a variation on the same theme. 



This idea of progressing through a sequence of round arches is one of Soane's favoured devices.  You see it in the long passage at the Bank of England and in the main corridor of the Board of Trade.  At the heart of the plan is the nave of course, where the congregation sits, but between these and the linked stair towers are buffer zones. one for the organ, one for the altar.  The inner corners at the ends of the aisles puzzled me at first, until I realised that they contained box-pews where prominent families could sit together with a degree of privacy. 

I created a diagram in a drafting view to clarify my understanding of this basic planning concept.



The planning phase progressed quite naturally into more detailed development of the interior.  I built out the organ gallery with a rough massing for the organ itself and enhanced the arch families that separate the side aisles from the nave.  These are reminiscent of the arches he used in his last two transfer halls at the Bank, with splayed edges running smoothly down into octagonal columns, which are really quite slender.  I did quite a lot of family editor work in the end: a line-based array for the wooden balustrading, and a fascinating support beam for the tiered galleries above the aisles (shallow arched soffit with a bracket where it meets the wall.)



There has to be a bell-ringing chamber above the arched lobby at the main entrance and I decided this was accessed via the tiered seating at the sides of the organ, then going behind the organ to access a door via a few more steps.  I don't know if the bells still work, but I did find out that the church was damaged in the second world war and restored afterwards.  It seems to me that both the organ and the altar piece are original Soane designs.



As you can see, I am making regular use of Enscape images now. The interior comes across nicely with a hint of black line edges and some fog to bring out the sunlight through the arched windows.  Shame these don't have coloured glass in them yet.  Soane loved the effect of light through coloured glass.  You can see the box pews though and the shallow coffers in the ceiling with typical Soane rosettes.



Soane was not a big fan of organised religion and his church designs represent the culmination of the "rational classical" phase of Anglican Church Architecture.  Soon after his death, the fashion would swing back towards a more "high-church" Gothic Revival approach.  I don't think he would have approved, but he did quite enjoy bringing something of the Gothic strutural expression into his taught and spare classical designs.  You can see it here in the "crossing" with its pierced roundels.



So, almost three weekends into this "BIM pencil" research project, I have quite a good feel for the overall planning and the detailing is also shaping up quite well.  He's working to a tight budget, and he himself is a Deist at best (This project predates Darwin's voyage on HMS Beagle by a decade) so the stripped-down version of his classical style is on display here.



The third phase of activity last weekend involved adding trees and site context to give some background to the external views.  Spent my last half hour moving around in Enscape and grabbing a whole bunch of views to record the current state of the model.  Here's a high-level view from the rear.



All three of his churches feature axial approaches, although this has been obscured for the other two by later road and rail developments.  At Walworth the original approach is intact and made quite an impression on me two years ago on my first tour of Soane projects.  The image below is a little misleading because the entrance gates and railings are missing.



Those railings enclose a calm green space in a quiet residential square, just a stone's throw from a busy cosmopolitan high street.  It's rich in history too.  At one time there were live monkeys in the garden to the north where the graveyard was.  Today the gravestones are stacked up against the wall and there's been some creative landscaping plus a ramp down to a community centre in the vaults of the converted crypt.  Sadly this was closed when I visited, but I plan to go and have a coffee in the cafe down there next time I'm in London.



Hands-on modelling using Revit has pulled me in to the life and history of this Church which remains a dynamic part of the community of Walworth to this day, almost 200 years after Soane designed it.  I'd love to meet some of the people who continue to bring it to life in the 21st century.  This weekend I discovered that there is a bell-ringing society who include it in their rounds (a lighter set of bells was installed after the post-war restoration)



I have always thought that Soane's work is a bit of an acquired taste.  I took to the exterior of this church almost immediately, but when I found photos of the interior I was a bit disappointed.  It seemed rather dull, to be honest.  But during the course of modelling it though, my opinion has changed.  It's a very carefully constructed space, eminently practical and fairly plain, but with just enough of his signature classical detailing to soften the effect.



Thanks to Enscape3d I have an embarrassment of rich imagery to share.  Lots to talk about too, but running out of time to write it down so here's a little collection to wet your appetite.




The way he handles the various arches, which are structural of course, hints at the expressiveness of gothic, while remaining within the classical idiom.  I'm on my third weekends now, and so far this has been a perfect demonstration of the value of Revit as a research tool.  I've been in problem-solving mode throughout, and built up an understanding of the design and construction of this church that would have been impossible by any other method.



This weekend, I intended to progress the modelling further (the crypt, louvres and clock on the tower, curved internal corners of the stairs, better representation of the stairs and railings ... lots still to do.  But instead I found that the modelling had posed questions that I needed to answer by collecting more data.  Analysis of that data will have to wait another week, but I can hint that it involved comparisons of all three church designs.  Here is a quick massing model that I built along the way.


Sunday, October 29, 2017

TEASING ST PETER

I've run out of time to do a proper blog post this weekend, but I need to post something.  Two weeks since I got back from my trip to BiLT Europe.  The second part of my session there dealt with the inherent scaling capability of the Planting category in Revit, and I used various classical elements for most of my examples, in particular my ongoing work to produce a classical columns collection capable of tackling just about any heritage BIM exploration I might want to take on.

Last weekend I did a bit more work on that collection and then decided to test the results on a real example.  I chose one of Soane's London churches.  St Peter's Walworth

https://projectsoane.wordpress.com/list-of-projects/late-works/churches/



Two weekends have been enough to produce a reasonably advanced model, and more importantly for me, to learn a good deal about Soane's approach to designing churches.  All three of his London churches were designed late in his career, and are essentially boxes with a tower over the front door.


Inside it gets a bit more interesting.  There's a nave and aisles, with sturdy Doric columns supporting the aisle galleries.  Stairs in the corners on either side of the entrance lobby provide access to these upper galleries.  He uses arches windows in arched recesses for this church, which is basically yellow brick with stone trim.



I guess the substantial stone bands at base and eaves act as ring beams from a structural viewpoint, bonding the smaller masonry units together and spreading loads.  It's an idea that has been supplanted by structural frames of steel or concrete in modern times but must have been fundamental to Soane's idea of stability in a medium to large building.



The guys at Enscape very kindly extended my license so I can carry on using it for Project Soane work.  In fact they sorted that out over breakfast at the hotel in Denmark so that I could use it during my session ( it expired the night before which I had not anticipated).  That was pretty impressive and much thanks due to Moritz Luck and Phil Read for allowing me to interrupt their cornflakes to organise that :)



The interior shot illustrates how easy it is to crank up the exposure a bit, add a hint of linework to increase the definition of the ceiling recesses and add some fog so that the light streaming through the windows over the altar looks more dramatic.  It will look even better when I get around to placing some pews and altar furniture of course, and stained glass would be very nice if I can figure that one out.

But beyond generating impressive images, I want to delve a bit deeper into the construction details, how the roof works, etc; and to analyse the rhythms of the side elevation which is quite subtle and relates to the spatial planning in ways which I am still getting to grips with.



Here's a rather unfinished ceiling plan.  The red Xs indicated where the stairs should be (not yet modelled) and the arrows at the back are conjectured functional routes for the resident priest to do his stuff.  I think he has rooms on two storeys in these back corners either side of the altar, but I haven't been inside the church.  I'm basing the interior on some rather low-res photos found on the internet.

That's it for now.  Just a teaser from an adventure in classical column use.  Four different columns/pilasters used here covering Doric, Ionic and Corinthian orders.  The collection is holding up quite well, but not showing up in plan views as well as I would like as yet.

Sunday, October 1, 2017

PLANTING SEEDS IN DENMARK

I'm in Denmark, attending the BiLT conference.  (Revit, BIM, other related stuff)  I am leading one session, called "Planting Seeds".  It's about the Planting category in Revit and the seeds part implies that I am presenting exploratory work that will continue to grow and hopefully stimulate others to build on my ideas.  In the course of my preparations, I opened up some of my early Revit work.  I showed some of the blog-related stuff a couple of weeks ago.  This one is focused on my day job at GAJ Architects, Dubai.



The first version of Revit I ever had was 7.0 so I spend quite some time using the Accurender version of raytracing before Mental Ray was introduced with Revit 2009.  (We also got the swept blend, colour fills in Sections, sloping pads, shape editing floors ... heady days) Accurender had very interesting Planting objects.  They looked a bit wierd in shaded views, but they rendered as genuine 3d objects. If you look carfully at the palm trees in the image above you will see this.  We are looking up into the canopy of the nearby ones, but at a distance you get a side view.



They also had some interesting controls, like "Trim Height" which allowed you to have a tall canopy on a short trunk, or vice-versa.  My next image shows an early example of mixing rendered and shaded images using layers in Photoshop, blending and filtering the image to simulate more of a hand-drawn look.  This can be especially effective to convey the softness of landscape elements.  But of course the "partner in charge" wasn't always convinced that Revit could "do" client-friendly images, so at times we just printed out Revit views and had our pencil and paper guys trace over them. Don't knock it.  Apart from producing very effective images, some useful design ideas can emerge along the way.



For a while I experimented with "Impression" which was free software for processing CAD files.  You could take a hidden line camera view, export it to CAD and use impression to turn the lines into a pencil effect.  This was hard work compared to say Sketchup which gave you a similar effect live, at the click of a button.  But I gave it a go and lived in hope.



The introduction of Mental Ray was quite exciting.  This is one of my very early attempts to exploit its potential.  The way it represents building elements if much more convincing than Accurender.  The shadows are more subtle and realistic with light bouncing around from surface to surface.  But the trees have moved in the reverse direction.  They look flatter, less volumetric, which is probably why I downplayed them so much in these views.



Opening one of the files and viewing with Enscape3d, the planting families that I placed back in 2008 immediately convert into fully volumetric objects.  Some of the custom materials have got screwed up, but that's nothing to do with Enscape, just the fact that my laptop doesn't have the right images on the paths set up under Options/Rendering.  Now this image isn't quite as impressive as some of the others I've been showing, but I'm pretty sure that if I spent half a day gathering together and tweaking the various linked files that were created for this project, I could create a couple of dozen images that represent it far better than the ones we generated in 2008.



Villa Savoye is a project I built around the same time.  It was partly motivated by my own fascination with the history of architecture and building technology, but I also used it as the subject for several training sessions, most notably a brief attempt to teach basic Revit skills to the partners at GAJ.  The image here compares a "realistic" view to the same shot in Enscape (top)  This is informative.  The tree shapes are quite different, although they obviously represent the same species.  The effect in Enscape is much sparser. The trees don't fill out the background as they did in the original.  I think part of the problem may be that some of the families are just not getting picked up in Enscape.  Maybe I have some dodgy RPCs in there.



But generally speaking, the Enscape trees are impressive and fully 3d.  You can view them from above and they look great.  They cast realistic shadows even when the sun is coming from the side. (RPC trees are flat billboards, so shadows from the side are very thin.)  In a realistic view you don't actually get any shadows at all.  Again I am not trying to criticise RPC families.  They are incredibly useful, lightweight and versatile, plus you can do a lot with the free starter pack that comes with a Revit installation.



The final image is not mine, and it's not Revit.  It was produced by the same team at GAJ that did the hand drawn image earlier on, this time using Sketchup and Photoshop.  I was helping a guy working on the same project, but using Revit.  It was early concept design stage, and we really struggled to compete with the Sketchup team.  We were quite proud of the images we came up with, but the partners thought they were awful.  I'm sure many of you have had similar experiences.  Plugins like Enscape3d definitely go a long way towards closing that gap, especially if you have the versatility and imagination to do a bit of mix and match with blended and processed images. 

I will be sharing some of the families from my session at Aarhus in coming weeks, so stay tuned.