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Certainly, a possibility to add user specifications to the dumb geometry (whether that be constraint-based feature definitions or just unit constraints) allows to express its design intent in the most powerful way. In direct modeling systems this intent can easily be lost. Few heard about cocreate before ptc bought it for 250 million dollars four years ago.
Conceptual design turned out to be the third niche. When i talked about the shortcomings of a procedural approach to parameterization (the main one is a priori split of all parameters into input and output ones), i did not mention a long-known alternative. Such constraint-based feature definition enables direct editing of a model transforming body faces under constraints.
In soliddesigner and spaceclaim such functionality is achieved by using patterns, enabling to select several facets simultaneously. Direct modeling allows modifying 3d geometry regardless of its history. And another is to recognize that a particular face is a result of sweep, loft, or blend operations.
Russian version of this paper is available when in 1985 samuel geisberg, an émigré from the ussr and a former professor of leningrad university, founded parametric technology corporation (ptc) in the usa to develop a proengineer system that revolutionized the market of mcad (mechanical computer-aided design software), could he imagine that parametric feature-based modeling, taken as its basis, would dominate the industry for a quarter of the century and that all leading mcadsystems (catia and nx, as well as represented by solidworks, inventor and solid edge) would become ideological successors of proengineer? And could he guess that having achieved an incredible commercial success, ptc would unexpectedly for everyone make a decision to sacrifice the holy of holies the proengineer brand? Pic. The fundamental principle of a users interface - wysiwyg ( ) - does not work here because you edit a text or a numerical value of a feature parameter, and as a result change the geometric body shape. In this case each transformation is done dynamically, while simultaneously satisfying all constraints that define the model.
Now they compete on the market with lgs 2d3d developed by a russian company ledas since 2001 and recently. However, being designed from scratch for the windows platform it looked very modern unlike cocreate, and generated by far more marketing noise each year spaceclaim reported threefold increase of their customer base (however, without disclosing absolute figures). Welcome to the notebookreview forum spotlight, a biweekly series where we highlight the hottest and most important topics in our forum.
These were applications for direct modeling, with the format compatible with the history-based systems from the same vendors. The same can be said about automated feature recognition in dumb geometry it can work only in the simplest cases and does not resolve the general problem. A co-founder of ptc and solidworks, he helped the new company to attract serious investors and build a solid customer portfolio. This leads to a so-called for instance, an extruded profile can be defined by perpendicularity constraints between the profile plane and side faces formed as a result of its extrusion, as well as by the distance constraint between the profile plane and the top (extruded) face. I am convinced that soon well see how direct modeling systems will boldly crack standard machine-building components with such complex faces.
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With all simplicity and universality, this history-based parameterization method has some serious drawbacks. Interestingly, in inventor fusion (as well as in its re-branded version for diy market called autodesk 123d), autodesk has also implemented a very simple constraint solver, which made these applications slightly similar to those being developed by ledas, except that autodesk products do not have an automatic constraint recognition module and the set of possible constraints (including all variations of types of their parameters) is considerably poorer. Traditional areas for application of such solvers used to be 2d parametric drawingsketching and 3d assembly designkinematics. It is only possible to change parameters of the first group, while the values of output parameters are calculated in accordance with pre-determined procedures, formulas, history, etc. Some of the first commercial products were the 2d3d dcm solvers developed by a uk-based company d-cubed (currently a part of siemens plm software) starting from the end of 1980s.
Few heard about cocreate before ptc bought it for 250 million dollars four years ago. In principle, spaceclaim did not offer anything new that soliddesigner did not have the same kernel (acis), the same concept of smart multi-selection of body faces, and the same direct and indirect editing operations. Direct editing is typical for direct modeling systems, while indirect editing is present in the history-based systems. However, being designed from scratch for the windows platform it looked very modern unlike cocreate, and generated by far more marketing noise each year spaceclaim reported threefold increase of their customer base (however, without disclosing absolute figures). Then the same model can be downloaded in a classic history-based application (inventor and creo parametric), where the changes made to the model in a direct modeling system can be integrated in its design tree.
In spite of rather modest figures, cocreate had a glorious track record under its belt, rooted in the mechanical design division of hewlett-packard. Constraint recognition is by far easier that feature recognition or tree reconstruction, because it is easy to verify possible geometric relations by iterating boundary elements. Welcome to the notebookreview forum spotlight, a biweekly series where we highlight the hottest and most important topics in our forum. Soliddesigner also allowed copying a feature from one place to another. A real success was signing oem agreements with trumpf, the worlds largest manufacturer of metal-cutting machines, and ansys, a leading provider of computer-aided engineering (cae) solutions. It is well known that in large geometry models design history can be rather long and its regeneration can take much time, which puts mcad users in a pending position and force them to waste their time and nerves in vain. Direct modeling allows modifying 3d geometry regardless of its history. Dynamic modeling by hp enabled users to chose one or several faces in a model and translate or rotate them. Boolean operations on solid bodies (that form the basis for form features). Recognising planar, cylindric, spheric, conic, or toric faces in a boundary model is one thing.This is a technical support forum for resolving all manner of computer issues.
Direct Modeling - Who and Why Needs It? A Review of ... - isicadArticles. 14 Nov 2011. Direct Modeling - Who and Why Needs It? A Review of Competitive Technologies. Dmitry Ushakov. This review is based on the author’s invited ...
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Editing complex nurbs surfaces is a challenge for modern direct modeling systems. As a result, after each transformation constraints remain satisfied, which means features still correspond to their definition (and design intent of the model is kept). Naming its new applications, ptc emphasises that there are two approaches to solid modeling parametric and direct, and each has its own niche. These were applications for direct modeling, with the format compatible with the history-based systems from the same vendors. The weak spot of all modern direct modeling systems remains editing complex nurbs surfaces.
All above-mentioned flaws of history-based parameterization were successfully overcame in a dynamic modeling system - soliddesigner, which for the first time equipped users with the tools for direct manipulation of elements of a geometric model in 3d space Buy now What Is A Review Article
Editing complex nurbs surfaces is a challenge for modern direct modeling systems. A year later siemens plm software announced its synchronous technology (admitting that it had been under development even at the times when the company was named unigraphics) in 2009 dassault systemes presented catia v6 liveshape to the world and autodesk its inventor fusion technology preview. The highlighted forum topics this week include the overheating macbook pro core i9 fiasco a diy project to water-cool a dell notebook upcoming pci-express version 4 and ddr5 memory testing. Everything changed in 2007 when ptc announced its deal with cocreate, and the first version of spaceclaim - an absolutely new direct modeling system - was released by the same-name company, created by blake courter and david taylor, former employees of ptc What Is A Review Article Buy now
In principle, spaceclaim did not offer anything new that soliddesigner did not have the same kernel (acis), the same concept of smart multi-selection of body faces, and the same direct and indirect editing operations. In many other cases a direct modeling system can be the only right choice. Unlike procedures, formulas and design history, are not oriented they do not determine which of the connected parameters is an input or an output one. This is in contrast to the procedural approach, where the two are interwined in the procedure definition. Another notorious drawback of history-based parameterization is that a decision, which model parameters can be changed, must be taken when you create the model Buy What Is A Review Article at a discount
Unlike procedures, formulas and design history, are not oriented they do not determine which of the connected parameters is an input or an output one. However, multi-selection for complex models can be inefficient and has a much reduced capacity - in comparison with automatic constraint recognition. If two planar faces of a model are parallel or perpendicular to each other, such orientation is most likely was intended by a designer of the initial model. Local operations in acis form the basis for efficient direct modeling. Spaceclaim made its stakes on the market when an industry legend mike payne was appointed its ceo.
Direct editing is typical for direct modeling systems, while indirect editing is present in the history-based systems Buy Online What Is A Review Article
Soliddesigner helped users automate selection of adjacent faces that form a feature (a pocket, a fillet, a hole, etc. In variational modeling parametric connections of a model are set declaratively by listing the constraints connecting the models elements. A real success was signing oem agreements with trumpf, the worlds largest manufacturer of metal-cutting machines, and ansys, a leading provider of computer-aided engineering (cae) solutions. The importance of work with such data is beyond doubt according to a recent conducted by aberdeen research, 82 of the respondents who work at design divisions use three and more cad data formats, and 42 - more than five formats. Design history is typically lost in translation from one cad format into another Buy What Is A Review Article Online at a discount
When i talked about the shortcomings of a procedural approach to parameterization (the main one is a priori split of all parameters into input and output ones), i did not mention a long-known alternative. Developers of ironcad for the first time showed direct editing within history-based modeling. Nevertheless, there are no doubts that this functionality will be built up as new versions are released. The same is true for holes of equal diameter, pockets of equal depth, various types of model symmetry, etc. Combining capabilities of parasolid geometric modeling kernel and 3d dcm geometric constraints solver, engineers of siemens plm software implemented the so-called (declaratively defined by constraints) features in solid edge, providing their users a choice either immediately design their models using synchronous features or build hybrid models with a tree comprising both procedural ( autodesk and ptc have offered their users a different approach, where direct geometry modeling takes place in separate applications (inventor fusion and creo direct accordingly), and users perform direct and indirect model editing (by means of driving dimensions) having no access to the design tree What Is A Review Article For Sale
The notebookreview forum is the largest internet forum dedicated to the discussion of notebook computers, including macs and tablets. To get a correct modification of such a model it is necessary to simultaneously rotate not only the upper but also the lower and side faces of the table top to keep their mutual parallelism and perpendicularity accordingly. Boolean operations are in the sense that union, intersection or difference of two bodies require compute-intensive operations with their complete boundary structures (here lies the productivity problem of history-based parametric systems). Effectively they have told their users you wanted direct modeling? Youve got it! Now you can promptly, conveniently and demonstrably (no worse than in spaceclaim) edit your own models and even integrate your changes into design history (impossible with spaceclaim) For Sale What Is A Review Article
This weeks forum spotlight looks at the dangers of using liquid metal thermal paste on aluminum heatsinks, hps new pavilion. Some expensive translators can convert features from one system into another, but its not a panacea as each system has its own mix of features and exact translation is impossible in principle. It is well known that in large geometry models design history can be rather long and its regeneration can take much time, which puts mcad users in a pending position and force them to waste their time and nerves in vain. In this case each transformation is done dynamically, while simultaneously satisfying all constraints that define the model. Direct modeling allows modifying 3d geometry regardless of its history Sale What Is A Review Article
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