別扯虛的，BIM的真正基礎是模型質量
本期內容翻譯自Antony McPhee的一篇文章，上面的視頻和音頻內容是精簡版乾貨，以下為原文及BIM盒子的獨家翻譯。
MakingBIM Work: Quality Models
BIM processes only work if there is something those processes can act upon.
No BIM models, no process.
And quality matters: without good quality models no matter how good BIM processes or standards are it will be extremely difficult for anyone to do anything useful.
Pretty basic stuff, but all too often ignored.
Ignored because to ensure these thing happen action has to occur at the very, very, beginning of a project. When each design consultant is signed up, because they are the BIM authors, the ones who will be creating the BIM models.
Ignored because owners assume BIM authors will produce adequate BIM models as part of their normal service, even when the contract deliverables are only drawings, schedules and specifications.
Now, one day this will hopefully change. Consultant agreements will by default contain common, widely understood BIM requirements. Consultants themselves will be familiar and comfortable with BIM software and what is necessary for quality BIM models.
But at present, pretty much everywhere, this is not the case. And it is not going to change if we dont start addressing this issue directly.
讓BIM工作起來：有質量的模型
想要BIM流程真正能夠實施起來，這些流程必須有一個實施的基礎。
沒有模型，也就沒有流程。模型的質量很重要，沒有一個優質的模型作為基礎的話，那無論流程設計的有多好，執行的標準有多嚴格，都沒法做出有實際意義的事情來。
這是個很基礎的事，但因為它太基礎了，反倒很少有人關注。
之所以沒人關注，是因為要獲得高質量的模型，必須在項目非常前期的時候，首批製作BIM模型的設計團隊，就關注這一項工作。而業主想當然地認為，即使合同上只寫了要求交付圖紙、表格和規格書，BIM團隊還是會主動地提供足夠好的BIM模型。
或許有一天這種情況能得到改善，設計合同能夠默認地包含普遍認可的通用BIM需求。設計公司也能夠成熟的利用BIM軟體，來製作高質量的BIM模型。
然而目前，在幾乎所有的項目中，事實都不是這樣的。要改變現狀，我們就得直面這個問題。
Why is there a Problem with Models?
The reason it is so difficult to get quality BIM models from design consultants is that they think their job is, for architects, to produce drawings, for engineers, to produce diagrams. So they use their software, whether BIM or not, to only produce drawings. Also they generally dont use their BIM software to produce schedules. As they see it their deliverable is a paper schedule, maybe an Excel spreadsheet. So why use your drawing software?
All this is because drawings have traditionally been their tangible deliverable, and is still the main contractual deliverable even in notionally "BIM" projects. Due in part because the reality is that drawings are still the legal documents that contractors use to construct from.
Mind you there are good reasons why drawings are used for legal evidence. All information on drawings is visible and unchangeable. Explanatory text can be included, status, revision sequence and issued date are all clearly displayed. It is very hard for someone to say "I didnt see it".
One day BIM models may be able to do these things, or things that achieve the same outcomes. There are examples around that do some of these things, or something similar, like Bentleys Hypermodel functionality, or the open source BIM Collaboration Format (BCF).
But presently there are no common, robust, methods that match the certainty of drawings.
So are architects and engineers justified in using their BIM software to just produce drawings?
為什麼模型會存在問題？
之所以很難得到好的BIM模型，是因為設計師們認為自己需要出的是圖紙，工程師們認為自己需要出的是詳圖，所以無論他們使用的是不是BIM軟體，他們都只是用來出圖。他們基本上不會用BIM軟體來出清單表格。他們普遍認為既然要出的是一張紙質的或者電子的表格，用畫圖軟體幹嘛？
這一切都因為，在傳統的交付模式中，圖紙是一種有形的交付物，即便是在已經有BIM概念的項目中，也還是一樣的。部分原因是，圖紙目前是施工單位進行建設的唯一合法依據。
這是由於圖紙上所有的信息都是明顯且不可改變的，設計說明、變更以及審核簽發日期等都有清晰的說明。看到圖紙的人不能說：「我沒看見這個信息。」
也許將來BIM模型也能達到同樣的功能，目前也有一些產品正向著這個方向努力，比如奔特力公司的Hypermodel，或者是開源的BCF也就是BIM Collaboration Format BIM協作格式。
不過BIM目前還沒有像圖紙那樣通行而有力的方法來達到這一目的。那是不是說，建築師和工程師就可以名正言順地僅僅用BIM軟體來生產圖紙呢？
BIMSoftware is Designed to produce Drawings
The softwares we use today to do BIM were not originally designed to do BIM. Theywere designed to produce drawings.
When ArchiCAD came out in 1987 the way it worked was that the building was modelledin 3D up to a point. Once it was decided to move to drawings, plans, elevationsand sections were created as separate files from the model and worked over toturn them into drawings.
Revit came out in 2000 with a similar functionality, except that plans, elevationsand sections remained live. Everything was in the one file, so changes in the3D model instantly appeared in all views created for drawings. But the purposeof Revit was still to create drawings.
Other software now used for BIM started life as CAD programs, with gradual 3Dfunctionality added to assist drawing production (e.g. Bentley, and the nowdefunct AutoDesk Architecture).
BIM as we know it today came from the realisation that the integrated 3D model thatthese softwares produced could be used for other purposes. In practical termsBIM is what these softwares are capable of doing, despite the efforts to extendBIM into the realm of fantasy by the standards wonks and BIM evangelists.
So if you use BIM software as it is intended to be used it will produce drawings for you. There is no need to "take shortcuts" to produce convincing looking drawings. And if you use the software properly it will be BIM ready, it will not "take more time" to do BIM.
BIM軟體被設計出來就是為了出圖的
其實，我們今天所使用的BIM軟體，本來就是為出圖而開發的，而不是為了做BIM。
ArchiCAD軟體在1987年問世的時候，它的工作方式就是在某種程度上進行三維建模，它被定義為繪圖軟體，讓平面圖、立面圖和剖面圖都可以通過旋轉和切割模型，自動被創建出來，並生成獨立的圖紙文件。
Revit軟體2000版本則是在保留了這些功能的前提下，新增了平立剖三視圖的關聯性。所有圖紙都和模型一起被保存在同一個文件中，一旦模型發生更改，所有的圖紙也都一起更改。即便這樣，Revit的目的還是創建圖紙。
其他一些軟體，比如bentley或者是已經被合併的 AutoDesk Architecture，也都是基於繪圖功能，而增加了一些三維輔助功能。
時至今日，軟體技術在進步，人們的想法也在進步。我們談論BIM，指的是BIM軟體所生產的模型可以有很多出圖以外的用途。具體來說，就是不管那些標準制定者和BIM的推廣者怎麼講，我們關注這些BIM軟體到底都能實現什麼功能。
你要是以BIM軟體的本來目的來使用它們，那它們就是用來畫圖的，你也不必找捷徑去畫一些很炫的圖。而如果你抱有更進一步的目的來使用它們，為真正的BIM做準備，那BIM就不會像很多人說的那樣「比傳統方式更浪費時間」了。
The Benefits of BIM to Authors
Much is made of using BIM models for 4D (construction sequencing), 5D (quantity measuring), 6D (life-cycle management), and other Ds. They can also be used for analysis and simulations, particularly in engineering - structural analysis, power circuits, mechanical systems etc.
What is often not appreciated is that a BIM model can also be used for quality assurance (QA) purposes. Checks can be utilised that minimise design errors, that ensure the model is in fact a quality BIM model and an accurate representation of what is to be built.
If all you produce are drawings and separate schedules, you can only check drawings and schedules.
If your BIM models are created properly you can use the model to do the checking.
If your walls contain their fire rating as data in a parameter you can colour code those walls, the same for fire rated doors, fire rated dampers etc. Which makes checking that the correct walls and doors are in the right place much quicker than trawling through multiple drawings and cross referencing schedules.
If your doors contain size data you can run a model check for doors with heights or widths below minimum required values. Check concrete walls required to be fire rated to ensure their thickness achieves their rating. You get the idea, the list is endless.
These checks can be manual (e.g. use Filters in Revit or the free add-in Color Splasher to color-code views by object parameter), or automated (e.g. Revits inbuilt Warnings, Autodesk Model Checker for Revit, Solibri IFC model checker).
And because drawings and schedules come directly from the model they will be correct if the model is correct.
When I say correct, I mean correct information. Letting software create your drawings and schedules means forgoing some control over graphic representation. But then BIM authors are architects and engineers, not graphic artists. The question they need to ask is not does this drawing look "neat", but can it be misinterpreted? Will the contractor build the wall using the wrong material or in the wrong place because the lineweight is not exactly right, the hatch pattern doesnt align perfectly? Will they mistake a grid for something else because its head doesnt perfectly align with other grids?
The bottom line is that it is possible to be much more thorough when checking a model as compared to checking drawings and schedules. It can also be done much quicker, especially if standardised automated model checking processes are implemented alongside manual checking. All this leads to less errors in documents, meaning less time wasted dealing with mistakes, both internally and on site.
There is no real excuse for design consultants to NOT produce good quality BIM models. They should be doing as part of their normal duty of care.
BIM對作者的好處
很多BIM案例應用的都是4D技術——施工進度模擬，5D技術——成本管理，6D——全生命周期管理，以及更多的D。還可以被應用與分析和模擬，尤其是結構分析、電力分析和機械系統等等。
BIM不怎麼被重視的一個應用是，它可以用於QA，即質量保證。通過檢查和審核，盡量減少錯誤，使模型成為高質量的BIM模型，從而精確地指導未來的建設。
如果你手裡的東西只有圖紙和表格，那你就只能檢查圖紙和表格。如果你的模型被精細妥善的創建，那你就可以利用它來進行檢查。
如果你的模型中的牆包含了防火等級參數，類似的還有防火門或者防火閥，你可以用顏色標註它們的防火等級情況，這樣檢查防火牆和防火門是否在正確的位置，就比在圖紙和表格上檢查來的直觀和方便多了。
這種檢查可以是手動的，比如利用revit的過濾器功能，或者是利用一些插件，比如 ColorSplasher ，給模型中不同參數條件的構件上色。也可以是自動的，比如revit自帶的警告功能，AutodeskModel Checker for Revit, Solibri IFC model checker 等等。
由於圖紙和表格都是從模型直接出的，所以只要檢查後模型是正確的，那出的圖也就是正確的。
我說的正確，是指信息正確。讓軟體通過模型來自動創建圖紙和表格，意味著需要放棄一些對圖形表現的控制。但BIM模型的作者是建築師和工程師，而不是藝術家。他們需要關注的不是圖紙是否優雅整潔，而是它是否準確無誤。會不會由於圖紙線寬的錯誤、填充圖案的錯誤，導致施工方拿著這份圖紙施工的時候弄錯了牆的材質，或者乾脆建錯了地方？會不會因為一條軸網的標頭沒有和其他軸網對齊，而導致他們把軸網線錯看成了牆線？
至少，檢查模型比檢查圖紙和表格來的更徹底，更快捷。尤其是手動檢查和符合標準的自動檢查相結合的時候。所有這些，都讓最終文件中的錯誤大大減少，也就意味著設計階段和現場施工階段浪費在糾錯上的時間大大減少。
實際上，設計公司沒有理由不提供優質的BIM模型，他們的設計工作本來就應該沒有錯誤。他們應該把提供準確無誤的模型，當成他們工作的一部分。
Why wont People Share?
Producing good quality BIM Models is one thing, but if these models are not shared BIM processes will fail.
The comments above about checking the model instead of drawings and schedules extends to other peoples work. It is much easier and quicker to see if structure is aligning with architecture if both models are linked together and viewed in 3D. And there are softwares that can automate this checking. Revit has a built-in clash detection ability, Naviworks and Solibiri are specialised software for doing this type of checking.
Design consultants, particularly architects, generally dont like giving their native models to anyone. They see them as their property. The justification is that their contractual deliverables are completed drawings, schedules and specifications. BIM models are their "internal working documents".
Design professionals are also generally paranoid about having their ideas stolen, which they extend to the documents they produce.
And some have this view that as initial author of BIM models they have the right to total control of that model including getting paid whenever anyone makes use of it.
None of these justifications are valid. They just need to get over the fact that in the 21st Century drawings are no longer their only deliverable, and that current legal protections easily extend to cover other deliverables.
However there is a mistaken belief (and not just by design consultants) that handing over models means providing an untouched copy of the model, still containing all its housekeeping and drawing creation setup. None of this is required for BIM Uses. It should be removed - as a requirement. No-one wants to trawl through someone elses rubbish, and allowing people to recreate the drawings of others is a legal minefield.
人們為何不願分享？
有了高質量的BIM模型是一回事，而分享是另一回事。如果這些模型不能良好的共享，那BIM流程也就無法成功。
咱們上面說到的用模型檢查來代替圖紙和表格這種方式，可以延伸到他人的工作流程。如果結構模型和建築模型被鏈接到一起，就可以很容易地在三維環境下檢查二者是否準確的對齊了。除了用肉眼，還有一些軟體自已自動進行這種檢查。Revit軟體自帶這項功能，Navisworks和Solibiri則是為模型檢查專門開發的軟體。
設計團隊，尤其是建築設計團隊，不願意把他們建立的模型交給其他人。他們把這些模型視為自己的私有財產。理由很簡單，他們和業主簽訂的交付合同上要求的，是提供圖紙、表格和設計說明。BIM模型被用來生產這些東西，模型本身是「內部文件」。
設計師們也很擔心模型文件中所反映的想法和理念被別人偷走，很多人認為，作為BIM模型的原始作者，他們對模型享有控制權，如果你想要這個模型，就應該付費。
然而這些理由在法律上都是無效的。人們需要去適應，現在已經是21世紀了，圖紙不再是他們唯一的交付物，現行的法律保護已經延伸到其他的交付物中了。
即便作者同意共享，也存在問題。不僅是設計師，很多人也都認為交出他們的模型就是直接原封不動的copy一份出去，包含所有的視圖和原始出圖設置。其實這些在BIM應用中都完全沒必要，甚至需要在交出模型的時候刪除掉。沒人需要一大堆對自己沒有意義的垃圾信息，此外，在別人的圖紙基礎上重新繪圖也是存在法律風險的。
Whatis a Quality Model?
In simple terms by quality model I mean a model that is:
Fully modelled in 3D.
Is modelled as it will be constructed.
Uses correct categories and types.
All objects contain data about themselves.
Data is consistent and coherent.
and taking into consideration the fact that drawings and schedules are contractual deliverables:
The model must match issued drawings.
Data in the model must match issued schedules.
It is not so much about WHAT information is in the model (which most standards seem to concentrate on, including LOD descriptions, but that the information that is there is complete and can be relied upon.
This is where discussion of BIM becomes confused. Many believe BIM is about extra work and extra data. It is not. It is about data that is produced for normal purposes being in a consistent format.
The final format doesnt even matter. If data is consistent it can be converted from one format to another. If data required for COBie exists in a model it can be converted to COBie format on export. It doesnt have to exist in the model in COBie format.
If someone wants data that is not usually created as part of your normal service then it is an extra cost. An architect may put minimum warrantee requirements in their specification, but if the owner wants the manufacturers actual warrantee information in the architects model that is work they would not normally do and so is an extra.
In short a quality BIM Model is one that has been created by people doing what they normally do and using their BIM software the way it was designed to be used.
Not such a big ask.
什麼是高質量模型？
簡單來說，我所講的高質量模型有這麼幾個特點：
? 完整的三維圖形
? 以正式施工為目的而構建
? 族類別和族類型都是準確的
? 所有物體都包含自我說明的數據
? 所有數據都是一致和連貫的
如果再考慮到設計合同中規定需要交付圖紙和表格，那還要再加上這兩點：
? 模型必須與正式圖紙吻合
? 數據必須與正式表格吻合
我並不是很看重模型中必須具備哪些信息，儘管很多的標準規定了這些內容，比如一些LOD標準。我更看重的是模型中的信息是完整而可靠的。
這就是對BIM的認識產生混亂的地方。很多人認為BIM就意味著更多的工作和更多的數據。事實並不是這樣的，BIM真正的價值核心是，所有信息保持原本的正常目的，只是它們的格式被統一了而已。
最終是什麼格式無所謂，只要格式是統一的，就能從一種格式轉變成另外一種格式。如果模型中的信息被施工運營建築信息交換（COBIE）需要，那就可以導出成COBie格式，而模型中信息本來的格式不一定非得是這個格式的。
如果別人跟你要的信息，不是你正常服務中包含的，的確是額外的工作成本。比如說，建築設計師一般會在設計文件中做一些簡單的維護說明，但如果業主要求設計師在模型中加入一些關於製造商產品的、非常詳細的維護說明，那這就是額外的工作了。
簡單概括，什麼是優質的模型？人們在創建模型的時候，做的還是原本的工作，生產的還是原本的信息，只是利用了BIM軟體，這些軟體被設計出來本來就是干這個用的。這樣做出來的模型，就是優質的模型。
真不是什麼大不了的事。
How to Obtain Quality Models
As explained above it cant be left solely to design consultants to initiate quality models. To be fair that is not all design consultants, there are some who are very good. And not yet, one day it will become standard practice, but for now owners have to be proactive.
There are two places requirements can be spelt out: - consultant engagement agreements and a projects BIM Brief.
Consultant engagement agreements are better because they are contractually binding, whereas a BIM Brief may or may not be, depending on what is in consultant engagement agreements. Also the BIM Brief may not be completed before consultants are engaged (particularly if those consultants are expected to participate in creating the BIM Brief).
Generally best practice is to include generic BIM model requirements in consultant engagement agreements, with specific requirements, and perhaps specific examples of good modelling practice, in the BIM Brief.
It is also best practice to embed BIM requirements within consultant engagement agreements and not simply have a separate "BIM Addendum" or "Exhibit", which can lead to contradictions and perpetuates the belief that using BIM is a separate service.
怎樣獲得優質的模型？
剛才我們也說了，不能只是靠設計諮詢團隊來生產優質的模型。公平的說，還有其他人適合做一部分的工作。也許有一天我說的這種情景會成為慣例，但目前還不行，還得靠業主有一定的前瞻性。
有效的需求可以在兩個地方提出來：顧問聘任協議書（在中國就是設計招標文件和設計合同），還有項目BIM章程。
顧問聘任協議書相對來說更好一點，因為它一般是跟合同綁定在一起的，而項目BIM章程有時候是這樣，有時候不是，這取決於顧問聘任協議是怎麼寫的，尤其是有的時候業主還指望著設計顧問介入後幫他們來編製BIM章程呢。
一般來說，比較好的做法是，在顧問聘任協議書中包含一個通用BIM模型要求，而在BIM章程中有具體要求和一些模型樣例。
最好的方法就是，將BIM需求融入到顧問聘任協議書中，而不是附加一個BIM條款。附加條款會讓人產生抵觸，因為BIM在這裡成為了一項獨立的附加工作。
Current BIM Engagement Documents
A number of organisations have produced contract addendums for BIM.
In the US there is the AIA Document E203-2013, BIM and Digital Data Exhibit by the American Institute of Architects, and in the UK the CIC/BIM Protocol by the Construction Industry Council.
None of these documents adequately address the issue of model quality. Some are better at addressing model sharing than others, but then introduce unnecessary complications. And some are simply impenetrable for normal humans, those who have to implement them.
The AIA E203-2013 is more like a BIM Brief, or BIM Execution Plan, it describes BIM processes rather than modelling requirements.
The CIC/BIM Protocol is mainly about sharing of models and delivery. That is if you can understand it. You would think by the 21st Century lawyers would have learnt to write understandable English. There is one sentence of 130 words with the only commas dividing up lists of items.
It also has other issues that conflict with standard head consultant engagement agreements.
Im not saying these documents are useless or dangerous (although Id be careful of using the CIC/BIM Protocol), but they are not enough to ensure quality BIM models.
目前的協議文件參考
一些組織給出了BIM合同附錄的樣本。比如美國建築師學會的 AIA Document E203-2013, BIM and Digital Data Exhibit ,英國建築協會的 CIC/BIMProtocol.
這些文件都沒有充分討論模型質量的問題。有些文件對模型分享的說明比較詳細，不過也同時帶來了不必要的難題。有些內容則讓實施BIM的正常人來讀起來難以理解。
AIAE203-2013文件更像是一份BIM實施章程，忽略了模型質量而更重視BIM流程。
CIC/BIMProtocol的內容則主要是關於分享和交付模型，前提是你能讀的懂它。讀這份文件你得像一個現代的律師那樣思考，文件中有的話長達130多個單詞，裡面只有幾個用於分隔名詞的逗號。文件中還包含一些和現有標準協議衝突的地方，總之這份文件值得吐槽的地方還是不少的。
我不是說這些文件沒有用或者有什麼危險，儘管我還是會小心使用CIC/BIM Protocol，但是對於BIM模型的質量，這些文件描述的確實不夠好。
What to put in Model Author Agreements
By Model Authors I mean anyone who is going to create BIM models. This may include design consultants, sub-contractors, construction consultants, and possibly FM consultants.
Ive only discussed model sharing and model quality above, but there are other issues that should be covered within contractual agreements. The minimum that an agreement should cover includes:
participation in BIM planning
provision of adequate resources to achieve BIM
model sharing
model quality
model use
Some examples:
BIM Planning
The Project BIM Briefing Plan forms part of the building brief and must be complied with.
When requested the Consultant will participate in the process to develop and update all project BIM Management Plans and will comply with these plans.
When requested the Consultant will attend BIM Planning meetings, Coordination and Clash resolution meetings.
Resourcing
The consultant will provide, at their own cost, all software, hardware and training required to comply with their project BIM requirements and responsibilities.
A person experienced in use of the Consultant』s main documentation software will be appointed Discipline Model Manager and be available to attend BIM meetings and address BIM and software related issues raised by other project participants.
Model Sharing
All models the Consultant creates for the project, and all exports from those models, shall be made available without restriction to all other project participants.
The consultant may, and is expected to, remove all elements, options, views, imports etc. that do not contribute to issued drawings and schedules from models before issuing them. They may also remove all titleblocks, sheets and layouts used to create issued drawings.
It is acknowledged that the Consultant retains Copyright of their authored models.
The Consultant will respect the rights of authors of models issued to them and will not use those models, or parts of those models, for purposes not directly required by the project.
The Consultant will not provide to third parties models issued to them by others without the consent of the model author.
The Consultant will not print or export contract drawings or schedules from models provided to them by others. If drawings or schedules are required they must be requested from the original model author.
Model Quality
The Consultant will ensure the information in issued BIM Models exactly matches information issued as drawings, schedules and other related documents. This requirement only extends to information that has been modelled or placed as parameters in model objects. (i.e. excludes 2D details and data linked to the model then used in schedules).
Model Use
The Consultant accepts that models issued by them will be used by others as a source of information for work the Consultant is responsible for.
The Consultant will make reasonable endeavours to ensure their models are adequate for purposes others may want to use their model for. However the Consultant can reserve the right to seek compensation from others if it involves work additional to their normal service.
模型作者協議中該寫些什麼
這裡的模型作者，指的是所有參與創建BIM模型的人。這裡面包括設計顧問、分包商、施工單位甚至是物業管理顧問。
上面我說過了模型分享和模型質量，還有一些問題是需要在合同和協議中被覆蓋到的。我認為一份協議至少需要包含以下幾條內容：
? BIM項目計劃
? 實施BIM的資源
? 模型的分享
? 模型的質量
? 模型的使用
舉一些例子：
BIM計劃
BIM執行計劃是建造計劃的一部分，必須嚴格執行。
當甲方提出需求時，設計顧問必須參與到BIM管理計劃的開發和更新工作，並嚴格執行這些計劃。當甲方提出需求，設計顧問必須參與BIM計劃會議，協調會議和碰撞問題解決會議。
BIM資源
設計顧問需要自費提供相關軟體、硬體和培訓，以滿足他們自己對項目BIM工作配合的需求和職責。顧問公司需要指定有經驗的專人負責本解決本項目的BIM應用問題。
模型分享
設計顧問為本項目創建的所有模型和所有導出的格式，需要和項目其他參與者兼容。
設計顧問在正式出圖之前，最好刪除模型中所有與這些無關的元素，比如模型設置、視圖、參照文件等；在正式出圖後，也可以刪除用來出圖的表格、標題和圖形布局等。
設計顧問對自己創建的模型保有著作權。對於其他模型作者創建的模型，設計顧問無權將它們用於與本項目無關的事項。
未經允許，設計顧問不得將模型作者創建的模型提供給第三方。設計顧問不得利用他人提供的模型做正式出圖用。如果需要圖紙，設計顧問需要向模型的原作者提出需求。
模型質量
設計顧問必須保證正式交付的BIM模型中的信息，與正式交付的圖紙、表格及其他文件完全吻合。
模型使用
設計顧問需接受他們創建的模型作為資源，被他人使用。這屬於設計顧問創建模型的責任之一。設計顧問需為他人能夠正常使用他們的模型而做出合理的努力。對於超出常規服務範疇的要求，設計顧問保有增加服務費的權利。
Example Model Quality Requirements
This list is generic enough to apply to all those who author models and the different BIM authoring software they use. It is by no means exhaustive, and can be augmented by specific requirements.
All project participants shall use compatible software to facilitate model exchanges. If a particular software is used by multiple participants all shall use the same version and all shall keep it updated.
A control model shall be created for levels, grids and shared coordinates. This shall be used by all model authors to establish common baseline information.
Correct categories shall be used, or layers / types etc. will be named to identify the type of object. For example, beams must be modelled as beams, or identified as beams, and not as floors.
All model elements in authoring models shall be in the authoring BIM software format. Imported geometry of a format different from authoring software shall not be used for parts of the building the consultant is responsible for.
Modelling shall, where possible, match construction methods. For example walls go between floor slabs, not through them.
All 3D models shall be consistent with issued 2D drawings.
All parameter data shall match issued schedules. This includes, but is not limited to, Area schedules, Revisions, FFE, Wall types, Equipment schedules.
Deliver 3D models as separate files per discipline with the same base point.
All 2D/3D drawings/models used as references in issued drawings shall be provided with the host file. Pathing of linked files shall be relative and not absolute.
When requested editable 3D geometry and data shall be issued in native authoring formats (e.g. RVT, 12da, .DWG, .DGN, Moss Genio, ASCII etc) as well as published formats (ie. .PDF, .NWC, DWF etc).
Ensure that all elements are modelled as individual selectable elements rather than multiple elements modelled as one element
Elements, including groups and nested components, are not to be mirrored where doing so creates a different product. (e.g. a dishwasher with an outlet on the left is a different product to a dishwasher with an outlet on the right).
Main construction elements (walls, columns, slab edges etc) and setouts are to be perfectly orthogonal or at angles no greater than 2 decimal points (e.g. 31.65°).
All dimension entities must be rounded to the nearest 1 millimetre, no higher (or rounding errors may occur in strings of dimensions). Dimension values shall not be overridden.
For those of you who know how to use your BIM software the things listed above will be seem pretty basic and obvious. Hopefully there is nothing that you are not already doing. But sometimes the simplest thing can prevent models from being used.
模型質量要求的例子
以下是一些在不同的模型作者和BIM軟體中通用的需求。注意不要原方不動的引用，在特定情況下可以修改和強化。
? 所有模型創建參與者需要使用相互兼容的軟體。若一款軟體是由多方同時使用，那所有參與者必須使用統一版本，並保持更新。
? 需要有一個核心控制模型，來規定標高、軸網和共享坐標。所有其他模型的建立需以此模型作為基準。
? 模型的族類別必須準確，若建立模型的軟體使用圖層，則構件所在的圖層必須按照相應的組類型進行命名。比如梁必須按照梁這個類別建立，或者它所在的圖層必須命名為梁，不能是樓板。
? 同一個模型中的所有元素必須是同一個軟體創建的，從其他軟體導入的不同格式的圖形不可以作為模型的一部分直接使用。
? 模型應儘可能符合實際施工情況，比如牆要在兩層樓板之間建立，而不是整體穿過樓板。
? 所有3D模型必須與正式發布的2D圖紙相吻合。
? 所有的參數數據必須與正式發布的表格吻合，包括房間面積、修訂記錄、牆的類型、設備類型等。
? 每個專業的3D模型需參照同樣的基準點單獨發布。
? 所有作為參照的2D圖紙和3D模型，需要與參照他們的圖紙共同發布。鏈接文件的路徑必須是相對路徑，而不是絕對路徑。
? 必要情況下3D圖形和數據需要同時發布兩種格式，一種是模型創建軟體本來的格式，比如RVT，另一種是通用格式，比如PDF NWC或者DWF
? 確保每個元素都可以單獨被選擇，而不是很多元素被建立為一個同一個可選擇元素（比如將多個設備建立成同一個族文件而不能選擇單個設備）
? 不可以像CAD那樣，通過鏡像創建不同的構件。比如介面在左邊的風機和介面在右邊的風機是完全不同的兩個產品，不能通過鏡像來創建，而是要單獨創建一個模型。
? 建築主要構件如牆、柱、板必須絕對正交，如果不是正交，則夾角最多精確到小數點後兩位，比如可以是31.65°，不能是31.6532°。
? 所有尺寸單位必須四捨五入到毫米，不可以人為修改尺寸標註數值。
作為熟悉軟體的你來說，上面列出的這些可能看起來非常基礎。希望這些在你的建模工作中都能輕鬆的一一做到。有的時候就是最基礎的事情導致模型無法正常使用。因為很多高級的關聯參數都是基於底層參數創建的，一旦底層參數出現了問題，高層參數就會出現各種奇怪的錯誤，有的錯誤你都不知道是怎麼回事。
Summary
? BIM requires quality BIM models.
? BIM requires BIM models to be shared.
? BIM software, if used as intended, will produce quality BIM models.
If you are a consultant or sub-contractor who authors BIM models review how you are using your BIM software. If those using it in your office are treating it as a drawing tool rather than a modelling tool then retrain them and introduce processes that ensure quality models are produced.
Accept others require access to your BIM models, and when providing those models make sure they only contain information you would normally be providing anyway.
If you are an owner, or contractor who engages design consultants and/or sub-contractors, review your engagement agreements and include minimum BIM and modelling requirement, and the obligation to share models. Dont rely on those you engage to do it for you unless you are certain that they will. And if they complain it will cost more find another consultant or sub-contractor that knows how to do their job properly.
總結
BIM需要高質量的模型
BIM需要模型被分享
只要使用得當，BIM軟體都能夠創建高質量的模型
如果你是設計師，或者是需要創建模型的分包商，重新看一看你是不是在正確的使用BIM軟體。如果你和你的同事只是把BIM作為出圖工具而不是建模工具，那你們需要重新培訓和學習，才能創建高質量的模型。
學著接受其他人向你索要你的模型，只要他們要的是你以份內的工作為目的創建的模型，而不是一些你本來不做的工作。
如果你是業主或者總包，聘請設計師、諮詢公司或者分包商來幫助你創建模型，重新看一下你的協議書和需求書，是不是包含對模型質量和模型分享的需求。如果你不提出要求，別指望別人來替你考慮這些問題。如果你提出的要求使他們抱怨額外增加了工作量，那你需要換一家做的更好的公司。
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