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Parametric Design Master Model

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Parametric Design
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  359 Parametric DesignProcess of a ComplexBuilding In Practice Using Programmed CodeAs Master Model Kat Park and Nicholas Holt issue 03,volume 08 international journal of architectural computing  360 Parametric Design Process of a Complex BuildingIn Practice Using Programmed Code As Master Model Kat Park and Nicholas Holt Abstract Parameter based design explorations inevitably require a unified mastermodel that represents the current design state,where each parameterbeing explored is essentially a critical sub-case of this master model.Throughout the constantly changing design state,it is beneficial tomaintain a master model that is flexible and adaptive.This paperdescribes the design process of a complex building whose mastermodel documented the design logic through implementation of software code.This process is illustrated by the case study of LotteSuper Tower (Seoul,Korea) from the beginning of schematic design toend of construction document phase.By maintaining the master modelas a platform-free software code,in contrast to platform-dependentmethods,the case study illuminates the advantages of documenting thegenerative logic behind design variations in a way that allows greaterflexibility and a higher level of alignment with design intent.  1.Introduction Integrating parametric models into the process of design requires aformalization of the generative logic and a systematic way of evolving this logicin concert with design changes.A successful master model must,therefore,keep track of the various parameters being explored.The critical sub-casesthat these parameters represent might be as simple as studying the effects of anumerical value on the building’s form or a much more complex set of valuesthat explore the building’s response to factors such as environmentalconditions.In the more complex scenarios it might be more efficient for theexplorations to take place outside of the master model;nevertheless,whateverdesign decisions might have been made need to be fed back into the mastermodel in order to propagate its influence on the overall design,as well asmanage the relationships among the various sub-cases.Parametricrepresentation of a design is a constantly evolving task,since most complexdesign problems in practice are continually reacting to addition and deletionof inputs at multiple scales and levels of complexity.Setting up a parametricmodel requires defining the major parameters in the initial stage,but thisinitial set of parameters continues to grow and change as the projectdevelops into different stages.Parametric modeling platforms existing todayoffer assistance in defining the parameters and their associativerelationships;however,it is inevitable that using their predefined set of toolswill make the representation dependent on the specific platform.The notionthat availability of a tool invites use is well accepted in design.[1] Differentmodeling platforms demand the end-user to have differing levels of understanding and rigor in the process of defining the parameters and theirrelationships.Rigor obtained through the constraints opposed by a softwareplatform is not only limited and often biased,but it is also dependent on theform defined by the platform.As design process is inherently “parametric,” itis important that designers use an open platform that is most appropriatefor building the relationships as they arise.The main roles that should be fulfilled by the unified master model are:ãoffer a platform for the iterative-evaluative loop for design optionsãcapture and document knowledge of other related disciplinesaffecting the designãprovide a platform for negotiating optimization of competingdisciplines.This paper demonstrates a new method of managing a complexparametric design system where programmed code captures theunderstanding of the inherent generative logic as well as how the systemmight be constructed or fabricated in an efficient and flexible way,whilefulfilling the main roles of a master model mentioned above. 361 Parametric Design Process of a Complex Building In Practice Using Programmed Code As Master Model  2.Existing Approaches to Master Data Models It is commonly agreed that all design tools have particular affordances andbiases,and they implicitly embody particular assumptions and values.Ingeneral,a designer’s toolkit represents a provisional equilibrium of capabilityand demand.[1] In this section,we provide an overview of design toolscommonly used in practice to aid in the design of projects similar in scaleand complexity to Lotte Super Tower,seek to illuminate the assumptionsand values embodied in each,and assess how well each meets the criteria of a successful unified master model as outlined above. 2.1.Master Data Model Using Non-parametric Platforms Non-parametric methods of representing a design are the most widely useddigital design tool in today’s practice,and thus provide a baseline againstwhich to asses the value of more advanced techniques.Setting up the logicfor a parametric model requires initial investment of time and effort,whichalways need to be evaluated against the projected lifespan of the model.Aquick conceptual study might sometimes call for a model without the needto document the logic or associative relationships,or the initial resourcesmight simply not be available.A 3D Rhinoceros model of a form (without the use of Grasshopperplug-in) is an example of non-parametric modeling platform.In this platform,one method of exploring or documenting design intent is to usegeometrical elements and geometrical operation tools offered by Rhino.Thismethod is perhaps most susceptible to the design being influenced by thetool.While a complete account of modeling by direct manipulation of thegeometry suggests a design process that is beyond the scope of this paper,we may speculate that a systematic approach to form-generation is possiblein this media by using points,construction lines,etc,to leave a trace of thelogic applied in creating the form.In other words,the subassembly of partsused to create the desired form is deliberately saved by the operator.  Figure 1.Construction figures aresaved in order to document the designgeneration explicitly 362 Kat Park and Nicholas Holt
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