Analysis of the relationship between generalized Bim and CAD under the current background

  I personally think BIM and CAD The biggest thing in common is " They all exist as data carriers ”

Intuitively BIM It's a three-dimensional model ,cad It's a two-dimensional drawing ,bim than cad Multi dimension , So many people will think rudely BIM yes cad The upgrade , In fact, this statement is not quite right , Because as a carrier, there is no distinction between high and low , Only right and wrong .

cad In the drawing The geometric data of each face is expressed in ‘ Dotted line ’ Form preservation of , The rest of the material information shall be in the text of the drawing 、 Save in the form of a form , How to use it Information transmission is realized through the understanding and processing of on-site professionals .

and bim One of the core theories of is to increase the amount of information on the carrier , To reduce this Human brain black box information processing process with uncertainty , Therefore, in theory, it reduces the difficulty of information communication , For example, look at BIM The model is like looking at a teacup There is no need to artificially abstract it into three dimensions , therefore BIM Our slogan is often oriented to “ The owner ”, Because for those who have mastered the current cad Model practitioners In fact, it doesn't make much sense , Many people will doubt that it's OK to use drawings , What other models are built , In fact, your doubts are right , Simply from the perspective of geometric abstraction It's really useless for practitioners , The form of visual three-dimensional model is only to conform to the visual habits of ordinary human beings .

Of course, in addition to the one-dimensional geometric data mentioned above , And the building structure 、 Construction information, etc , No more tables in the drawing , It exists as a model embedded , This is also bim and cad One detail of the difference , about cad We focus on what's in the drawing , about bim We care about what is hidden in the model file format , Because one focuses on communication between people , One focuses on software reading .

The reasons for the above differences , I mainly blame it on the development of computer software , Even in the extremely ancient engineering discipline of Civil Engineering , Computer software also accounts for an increasing proportion , On the one hand, the stronger the software data processing ability , Therefore, the amount of new carrier data will be greater stay cae From the early stage, it is a simple bar system model Now more complex entity models , Early grids were sparse , Now the grid can be more dense , Then there is more information . On the other hand, the more powerful the functions can be realized , And the function is expanding , For example, the wide application of machine learning needs to ensure the quantity and readability of data , Similarly, with the development of graphics and hardware, we can easily render models in browsers , More convenient front and back frames can make the web platform easier to make , Therefore, the new carrier needs to have better compatibility and scalability .

Through technological development, the civil engineering industry is forced to upgrade, and the final product is the current bim, Now let's go back to the previous question , Why don't I think cad and bim There is a clear upgrade relationship between them ？

Back at the end of the last century At the beginning of this century , There has been such an upgrade in the domestic construction industry , Well known Hand drawn drawing - Computer graphics , That is to say cad The origin of software , Observe the difference between the two industrial upgrades , We can clearly find that cad The development of is productivity oriented , namely After I used the drawing software , I can draw more pictures well and quickly , Its kernel has not changed Or the picture , This is computer aided technology . But this time bim It is non productivity oriented , That is, after I used it, my production efficiency has not been significantly improved , But the thinking model has fundamentally changed , And why do I need to use this thinking model Because we think this thinking mode is in big data 、 It is more suitable in the context of informatization , So we can temporarily bim It is characterized as a top-down technology oriented upgrade .

This is also what I think is the fundamental difference between the two , Is to change the thinking model , So my definition is “ At present, many practitioners speak of cad and bim It is a parallel relationship with equal status ”, In the process of communicating with employees cad Take advantage of transmission , Because it stipulates a mature and perfect thinking paradigm , In the process of human-computer interaction bim It has certain advantages because it has a larger amount of data , Function more , High scalability . Then we can infer here , In the process of software interaction , We further remove human influence , that bim and cad It's all redundant , Delivered 0 and 1 It's the root of everything .

Finally, I want to emphasize that this parallel relationship is not antagonistic , Like right now AR Visual models can be generated from drawings , The model can also naturally export two-dimensional format ,“ They all exist as data carriers ”. To put it in a relatively simple way ,bim and cad They are all called “ Data stream ” Two slow-moving boats on the .